{"id":50,"date":"2026-06-13T16:31:45","date_gmt":"2026-06-13T08:31:45","guid":{"rendered":"https:\/\/www.52runoob.com\/?p=50"},"modified":"2026-06-13T16:31:45","modified_gmt":"2026-06-13T08:31:45","slug":"python3-%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/www.52runoob.com\/index.php\/2026\/06\/13\/python3-%e5%ad%97%e7%ac%a6%e4%b8%b2\/","title":{"rendered":"Python3\u00a0\u5b57\u7b26\u4e32"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5728 Python 3 \u4e2d\uff0c<strong>\u5b57\u7b26\u4e32 (<code>str<\/code>)<\/strong> \u662f\u6700\u5e38\u7528\u3001\u529f\u80fd\u6700\u4e30\u5bcc\u7684\u6570\u636e\u7c7b\u578b\u4e4b\u4e00\u3002Python 3 \u7684\u5b57\u7b26\u4e32\u9ed8\u8ba4\u4f7f\u7528 <strong>Unicode<\/strong> \u7f16\u7801\uff0c\u652f\u6301\u5168\u7403\u6240\u6709\u8bed\u8a00\u7684\u5b57\u7b26\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0b\u662f Python 3 \u5b57\u7b26\u4e32\u7684\u5168\u9762\u6307\u5357\uff0c\u6db5\u76d6\u6838\u5fc3\u7279\u6027\u3001\u5e38\u7528\u64cd\u4f5c\u3001\u73b0\u4ee3\u683c\u5f0f\u5316\u65b9\u6cd5\u53ca\u907f\u5751\u6307\u5357\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u6838\u5fc3\u7279\u6027\u4e0e\u521b\u5efa<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4e0d\u53ef\u53d8\u6027 (Immutable)<\/strong>\uff1a\u5b57\u7b26\u4e32\u4e00\u65e6\u521b\u5efa\uff0c\u5176\u5185\u5bb9<strong>\u4e0d\u80fd\u88ab\u4fee\u6539<\/strong>\u3002\u6240\u6709\u201c\u4fee\u6539\u201d\u64cd\u4f5c\uff08\u5982\u66ff\u6362\u3001\u62fc\u63a5\uff09\u90fd\u4f1a\u8fd4\u56de\u4e00\u4e2a<strong>\u65b0\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u591a\u5f15\u53f7\u652f\u6301<\/strong>\uff1a\u5355\u5f15\u53f7 <code>'<\/code>\u3001\u53cc\u5f15\u53f7 <code>\"<\/code> \u5b8c\u5168\u7b49\u4ef7\u3002\u4e09\u5f15\u53f7 <code>'''<\/code> \u6216 <code>\"\"\"<\/code> \u7528\u4e8e\u521b\u5efa\u591a\u884c\u5b57\u7b26\u4e32\u6216\u6587\u6863\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">s1 = &#039;Hello&#039;\ns2 = &quot;World&quot;\ns3 = &quot;&quot;&quot;\u8fd9\u662f\u4e00\u4e2a\n\u591a\u884c\u5b57\u7b26\u4e32\uff0c\n\u4fdd\u7559\u4e86\u6362\u884c\u548c\u7f29\u8fdb\u3002&quot;&quot;&quot;<\/code><\/pre><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u7d22\u5f15\u4e0e\u5207\u7247 (Indexing &amp; Slicing)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b57\u7b26\u4e32\u662f\u6709\u5e8f\u5e8f\u5217\uff0c\u652f\u6301\u6b63\u5411\u7d22\u5f15\uff08\u4ece <code>0<\/code> \u5f00\u59cb\uff09\u548c\u8d1f\u5411\u7d22\u5f15\uff08\u4ece <code>-1<\/code> \u5f00\u59cb\uff0c\u4ee3\u8868\u672b\u5c3e\uff09\u3002<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><span>8<\/span><span>9<\/span><span>10<\/span><span>11<\/span><span>12<\/span><span>13<\/span><span>14<\/span><span>15<\/span><span>16<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">text = &quot;Python3&quot;\n\n# \u7d22\u5f15\nprint(text[0])    # &#039;P&#039;\nprint(text[-1])   # &#039;3&#039;\n\n# \u5207\u7247 [start:end:step] (\u5de6\u95ed\u53f3\u5f00)\nprint(text[0:4])      # &#039;Pyth&#039;\nprint(text[2:])       # &#039;thon3&#039; (\u7701\u7565 end \u8868\u793a\u5230\u672b\u5c3e)\nprint(text[:2])       # &#039;Py&#039; (\u7701\u7565 start \u8868\u793a\u4ece\u5f00\u5934)\nprint(text[::2])      # &#039;Pto3&#039; (\u6b65\u957f\u4e3a 2)\nprint(text[::-1])     # &#039;3nohtyP&#039; (\u6b65\u957f\u4e3a -1\uff0c\u5e38\u7528\u4e8e\u53cd\u8f6c\u5b57\u7b26\u4e32)\n\n# \u26a0\ufe0f \u6ce8\u610f\uff1a\u7d22\u5f15\u8d8a\u754c\u4f1a\u62a5\u9519 IndexError\uff0c\u4f46\u5207\u7247\u8d8a\u754c\u662f\u5b89\u5168\u7684\n# text[10]   # IndexError\nprint(text[0:100])  # &#039;Python3&#039; (\u5b89\u5168\u622a\u65ad)<\/code><\/pre><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u5e38\u7528\u64cd\u4f5c\u7b26<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">\u8fd0\u7b97\u7b26<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u8bf4\u660e<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u793a\u4f8b<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><code>+<\/code><\/td><td class=\"has-text-align-left\" data-align=\"left\">\u5b57\u7b26\u4e32\u62fc\u63a5<\/td><td class=\"has-text-align-left\" data-align=\"left\"><code>'Hi' + ' ' + 'Python'<\/code> \u2794 <code>'Hi Python'<\/code><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><code>*<\/code><\/td><td class=\"has-text-align-left\" data-align=\"left\">\u91cd\u590d\u5b57\u7b26\u4e32<\/td><td class=\"has-text-align-left\" data-align=\"left\"><code>'ab' * 3<\/code> \u2794 <code>'ababab'<\/code><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><code>in<\/code> \/ <code>not in<\/code><\/td><td class=\"has-text-align-left\" data-align=\"left\">\u6210\u5458\u68c0\u67e5<\/td><td class=\"has-text-align-left\" data-align=\"left\"><code>'Py' in 'Python'<\/code> \u2794 <code>True<\/code><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><code>==<\/code> \/ <code>!=<\/code><\/td><td class=\"has-text-align-left\" data-align=\"left\">\u5185\u5bb9\u6bd4\u8f83<\/td><td class=\"has-text-align-left\" data-align=\"left\"><code>'abc' == 'abc'<\/code> \u2794 <code>True<\/code><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><code>&lt;<\/code> \/ <code>&gt;<\/code><\/td><td class=\"has-text-align-left\" data-align=\"left\">\u5b57\u5178\u5e8f\u6bd4\u8f83\uff08\u57fa\u4e8e Unicode \u7801\u70b9\uff09<\/td><td class=\"has-text-align-left\" data-align=\"left\"><code>'a' &lt; 'b'<\/code> \u2794 <code>True<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\"># \u5e38\u7528\u5185\u7f6e\u51fd\u6570\ns = &quot;Hello&quot;\nprint(len(s))   # 5 (\u957f\u5ea6)\nprint(min(s))   # &#039;H&#039; (\u6700\u5c0f\u5b57\u7b26)\nprint(max(s))   # &#039;o&#039; (\u6700\u5927\u5b57\u7b26)<\/code><\/pre><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u5185\u7f6e\u65b9\u6cd5\u5927\u5168 (\u5206\u7c7b\u901f\u67e5) \ud83c\udf1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6240\u6709\u65b9\u6cd5\u5747\u4e0d\u4fee\u6539\u539f\u5b57\u7b26\u4e32\uff0c\u800c\u662f\u8fd4\u56de\u65b0\u5b57\u7b26\u4e32\u3002<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\ud83d\udd0d \u67e5\u627e\u4e0e\u5224\u65ad<\/h4>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><span>8<\/span><span>9<\/span><span>10<\/span><span>11<\/span><span>12<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">text = &quot;apple, banana, apple&quot;\n\nprint(text.count(&quot;apple&quot;))          # 2 (\u7edf\u8ba1\u51fa\u73b0\u6b21\u6570)\nprint(text.find(&quot;banana&quot;))          # 7 (\u8fd4\u56de\u9996\u6b21\u51fa\u73b0\u7d22\u5f15\uff0c\u627e\u4e0d\u5230\u8fd4\u56de -1)\nprint(text.index(&quot;banana&quot;))         # 7 (\u627e\u4e0d\u5230\u4f1a\u629b ValueError)\n\nprint(text.startswith(&quot;app&quot;))       # True\nprint(text.endswith(&quot;e&quot;))           # True\nprint(&quot;123&quot;.isdigit())              # True (\u662f\u5426\u5168\u4e3a\u6570\u5b57)\nprint(&quot;abc&quot;.isalpha())              # True (\u662f\u5426\u5168\u4e3a\u5b57\u6bcd)\nprint(&quot;a1&quot;.isalnum())               # True (\u662f\u5426\u5168\u4e3a\u5b57\u6bcd\u6216\u6570\u5b57)\nprint(&quot;   &quot;.isspace())              # True (\u662f\u5426\u5168\u4e3a\u7a7a\u767d\u5b57\u7b26)<\/code><\/pre><\/div><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u2702\ufe0f \u62c6\u5206\u4e0e\u5408\u5e76<\/h4>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><span>8<\/span><span>9<\/span><span>10<\/span><span>11<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">csv = &quot;apple,banana,cherry&quot;\nwords = csv.split(&quot;,&quot;)              # [&#039;apple&#039;, &#039;banana&#039;, &#039;cherry&#039;]\n# \u9ed8\u8ba4 split() \u6309\u4efb\u610f\u7a7a\u767d\u5b57\u7b26(\u7a7a\u683c\/\u6362\u884c\/\u5236\u8868\u7b26)\u5206\u5272\uff0c\u4e14\u81ea\u52a8\u8fc7\u6ee4\u7a7a\u5b57\u7b26\u4e32\n&quot; a  b \\t c &quot;.split()               # [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;]\n\n# \u53cd\u5411\u62c6\u5206\ntext = &quot;root-user-admin&quot;\nprint(text.rsplit(&quot;-&quot;, 1))          # [&#039;root-user&#039;, &#039;admin&#039;] (\u6700\u591a\u62c61\u6b21\uff0c\u4ece\u53f3\u8fb9\u5f00\u59cb)\n\n# \u5408\u5e76 (\u6ce8\u610f\uff1ajoin \u8c03\u7528\u7684\u662f\u5206\u9694\u7b26\uff01)\nresult = &quot; | &quot;.join(words)          # &#039;apple | banana | cherry&#039;<\/code><\/pre><\/div><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\ud83d\udd04 \u4fee\u6539\u4e0e\u8f6c\u6362<\/h4>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><span>8<\/span><span>9<\/span><span>10<\/span><span>11<\/span><span>12<\/span><span>13<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">s = &quot;  Hello World  \\n&quot;\n\nprint(s.strip())        # &#039;Hello World&#039; (\u53bb\u9664\u4e24\u7aef\u7a7a\u767d\/\u6362\u884c)\nprint(s.lstrip())       # \u4ec5\u53bb\u5de6\u7aef\uff0crstrip() \u4ec5\u53bb\u53f3\u7aef\n\nprint(s.replace(&quot;World&quot;, &quot;Python&quot;))  # &#039;  Hello Python  \\n&#039;\nprint(s.replace(&quot;l&quot;, &quot;L&quot;, 2))        # \u6700\u591a\u66ff\u63622\u6b21: &#039;  HeLLo World  \\n&#039;\n\nprint(s.upper())        # &#039;  HELLO WORLD  \\n&#039;\nprint(s.lower())        # &#039;  hello world  \\n&#039;\nprint(s.title())        # &#039;  Hello World  \\n&#039; (\u9996\u5b57\u6bcd\u5927\u5199)\nprint(s.capitalize())   # &#039;  hello world  \\n&#039; (\u4ec5\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5927\u5199)\nprint(&quot;hELLO&quot;.swapcase())# &#039;Hello&#039; (\u5927\u5c0f\u5199\u4e92\u6362)<\/code><\/pre><\/div><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\ud83d\udcd0 \u5bf9\u9f50\u4e0e\u586b\u5145<\/h4>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">num = &quot;42&quot;\nprint(num.zfill(5))     # &#039;00042&#039; (\u5de6\u4fa7\u8865\u96f6\uff0c\u5e38\u7528\u4e8e\u7f16\u53f7)\nprint(num.center(10, &#039;-&#039;)) # &#039;----42----&#039;\nprint(num.ljust(5, &#039;*&#039;))   # &#039;42***&#039;\nprint(num.rjust(5, &#039;*&#039;))   # &#039;***42&#039;<\/code><\/pre><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. \u5b57\u7b26\u4e32\u683c\u5f0f\u5316 (\u73b0\u4ee3 Python \u63a8\u8350)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece Python 3.6 \u5f00\u59cb\uff0c<strong>f-string<\/strong> \u662f\u7edd\u5bf9\u7684\u9996\u9009\uff0c\u6027\u80fd\u6700\u9ad8\u4e14\u6700\u6613\u8bfb\u3002<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><span>8<\/span><span>9<\/span><span>10<\/span><span>11<\/span><span>12<\/span><span>13<\/span><span>14<\/span><span>15<\/span><span>16<\/span><span>17<\/span><span>18<\/span><span>19<\/span><span>20<\/span><span>21<\/span><span>22<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">name = &quot;Alice&quot;\nage = 25\nscore = 95.567\n\n# 1. f-string (Python 3.6+)\nmsg = f&quot;\u59d3\u540d: {name}, \u5e74\u9f84: {age}, \u5206\u6570: {score:.2f}&quot;\nprint(msg)  # \u59d3\u540d: Alice, \u5e74\u9f84: 25, \u5206\u6570: 95.57\n\n# f-string \u652f\u6301\u8868\u8fbe\u5f0f\nprint(f&quot;\u660e\u5e74\u5e74\u9f84: {age + 1}&quot;)  \nprint(f&quot;\u5206\u6570\u662f\u5426\u53ca\u683c: {score &gt;= 60}&quot;)\n\n# Python 3.8+ \u8c03\u8bd5\u6280\u5de7: f&quot;{\u53d8\u91cf=}&quot; \u4f1a\u540c\u65f6\u6253\u5370\u53d8\u91cf\u540d\u548c\u503c\nx = 10\nprint(f&quot;{x=}&quot;)  # x=10\n\n# 2. .format() (Python 2.6+ \u517c\u5bb9\u65e7\u4ee3\u7801)\nmsg2 = &quot;\u59d3\u540d: {}, \u5e74\u9f84: {}&quot;.format(name, age)\nmsg3 = &quot;\u59d3\u540d: {n}, \u5e74\u9f84: {a}&quot;.format(n=name, a=age)\n\n# 3. % \u683c\u5f0f\u5316 (\u53e4\u8001\u65b9\u5f0f\uff0c\u4ec5\u7ef4\u62a4\u65e7\u9879\u76ee\u65f6\u4f7f\u7528)\nmsg4 = &quot;\u59d3\u540d: %s, \u5e74\u9f84: %d&quot; % (name, age)<\/code><\/pre><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">6. \u8f6c\u4e49\u5b57\u7b26\u4e0e\u539f\u59cb\u5b57\u7b26\u4e32<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8f6c\u4e49\u5b57\u7b26<\/strong>\uff1a\u4ee5 <code>\\<\/code> \u5f00\u5934\uff0c\u7528\u4e8e\u8868\u793a\u7279\u6b8a\u5b57\u7b26\u3002<\/li>\n\n\n\n<li><code>\\n<\/code> \u6362\u884c, <code>\\t<\/code> \u5236\u8868\u7b26, <code>\\\\<\/code> \u53cd\u659c\u6760, <code>\\'<\/code> \/ <code>\\\"<\/code> \u5f15\u53f7<\/li>\n\n\n\n<li><strong>\u539f\u59cb\u5b57\u7b26\u4e32 (Raw String)<\/strong>\uff1a\u5728\u5f15\u53f7\u524d\u52a0 <code>r<\/code>\uff0c<strong>\u5ffd\u7565\u6240\u6709\u8f6c\u4e49<\/strong>\u3002\u975e\u5e38\u9002\u5408\u6b63\u5219\u8868\u8fbe\u5f0f\u548c Windows \u6587\u4ef6\u8def\u5f84\u3002<\/li>\n<\/ul>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">path = &quot;C:\\\\Users\\\\Admin\\\\file.txt&quot;  # \u9700\u8981\u53cc\u53cd\u659c\u6760\u8f6c\u4e49\nraw_path = r&quot;C:\\Users\\Admin\\file.txt&quot;  # \u66f4\u6e05\u6670\uff0c\u63a8\u8350\uff01\n\nprint(&quot;Line1\\nLine2&quot;)   # \u8f93\u51fa\u4e24\u884c\nprint(r&quot;Line1\\nLine2&quot;)  # \u8f93\u51fa: Line1\\nLine2<\/code><\/pre><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">7. \u7f16\u7801\u4e0e\u89e3\u7801 (<code>str<\/code> vs <code>bytes<\/code>) \ud83c\udf10<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Python 3 \u4e25\u683c\u533a\u5206\u4e86<strong>\u6587\u672c (<code>str<\/code>)<\/strong> \u548c<strong>\u4e8c\u8fdb\u5236\u6570\u636e (<code>bytes<\/code>)<\/strong>\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>str<\/code> \u662f Unicode \u6587\u672c\uff0c\u7528\u4e8e\u4ee3\u7801\u5185\u90e8\u5904\u7406\u3002<\/li>\n\n\n\n<li><code>bytes<\/code> \u662f\u539f\u59cb\u5b57\u8282\u5e8f\u5217\uff0c\u7528\u4e8e\u7f51\u7edc\u4f20\u8f93\u3001\u6587\u4ef6\u8bfb\u5199\u3001\u56fe\u50cf\u5904\u7406\u7b49\u3002<\/li>\n<\/ul>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><span>8<\/span><span>9<\/span><span>10<\/span><span>11<\/span><span>12<\/span><span>13<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">text = &quot;\u4e2d\u6587 Python&quot;\n\n# \u7f16\u7801\uff1astr -&gt; bytes (\u5fc5\u987b\u6307\u5b9a\u7f16\u7801\uff0c\u63a8\u8350 utf-8)\nb_data = text.encode(&quot;utf-8&quot;)\nprint(b_data)  # b&#039;\\xe4\\xb8\\xad\\xe6\\x96\\x87 Python&#039;\n\n# \u89e3\u7801\uff1abytes -&gt; str\nrecovered = b_data.decode(&quot;utf-8&quot;)\nprint(recovered)  # &#039;\u4e2d\u6587 Python&#039;\n\n# \u26a0\ufe0f \u5e38\u89c1\u62a5\u9519\uff1aUnicodeEncodeError \/ UnicodeDecodeError\n# \u539f\u56e0\uff1a\u901a\u5e38\u662f\u5728\u8bfb\u53d6\u975e UTF-8 \u7f16\u7801\u7684\u6587\u4ef6\uff08\u5982 GBK\uff09\u65f6\u672a\u6307\u5b9a\u6b63\u786e\u7f16\u7801\u3002\n# \u89e3\u51b3\uff1aopen(&quot;file.txt&quot;, encoding=&quot;gbk&quot;)<\/code><\/pre><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udca1 \u6838\u5fc3\u907f\u5751\u4e0e\u6700\u4f73\u5b9e\u8df5<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6c38\u8fdc\u8bb0\u4f4f\u201c\u4e0d\u53ef\u53d8\u6027\u201d<\/strong><\/li>\n<\/ol>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">   s = &quot;hello&quot;\n   s.replace(&quot;h&quot;, &quot;H&quot;)  # \u274c \u6beb\u65e0\u4f5c\u7528\uff01replace \u8fd4\u56de\u65b0\u5b57\u7b26\u4e32\uff0c\u4f46\u6ca1\u88ab\u63a5\u6536\n   s = s.replace(&quot;h&quot;, &quot;H&quot;)  # \u2705 \u6b63\u786e\u505a\u6cd5\uff1a\u91cd\u65b0\u8d4b\u503c<\/code><\/pre><\/div><\/div>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u5faa\u73af\u4e2d\u62fc\u63a5\u5b57\u7b26\u4e32\u7684\u6027\u80fd\u9677\u9631<\/strong><\/li>\n<\/ol>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">   # \u274c \u4f4e\u6548\uff1a\u6bcf\u6b21 += \u90fd\u4f1a\u521b\u5efa\u65b0\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0cO(n\u00b2) \u590d\u6742\u5ea6\n   result = &quot;&quot;\n   for i in range(10000):\n       result += str(i)\n\n   # \u2705 \u9ad8\u6548\uff1aO(n) \u590d\u6742\u5ea6\uff0c\u63a8\u8350\u505a\u6cd5\n   result = &quot;&quot;.join(str(i) for i in range(10000))<\/code><\/pre><\/div><\/div>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u5224\u65ad\u7a7a\u5b57\u7b26\u4e32<\/strong><\/li>\n<\/ol>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">   s = &quot;&quot;\n   # \u274c \u4e0d Pythonic\n   if len(s) == 0: ...\n   # \u2705 \u63a8\u8350\uff1a\u5229\u7528\u7a7a\u5b57\u7b26\u4e32\u7684\u5e03\u5c14\u503c\u4e3a False\n   if not s: ...<\/code><\/pre><\/div><\/div>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong><code>find()<\/code> vs <code>index()<\/code><\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 <code>find()<\/code> \u66f4\u5b89\u5168\uff0c\u627e\u4e0d\u5230\u65f6\u8fd4\u56de <code>-1<\/code>\uff0c\u4e0d\u4f1a\u4e2d\u65ad\u7a0b\u5e8f\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>index()<\/code> \u65f6\uff0c\u5982\u679c\u627e\u4e0d\u5230\u4f1a\u76f4\u63a5\u629b\u51fa <code>ValueError<\/code>\uff0c\u9002\u5408\u201c\u5fc5\u987b\u5b58\u5728\u201d\u7684\u573a\u666f\u3002<\/li>\n<\/ul>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>\u5b57\u7b26\u4e32\u9a7b\u7559 (String Interning)<\/strong><br>Python \u4f1a\u7f13\u5b58\u4e00\u4e9b\u77ed\u5b57\u7b26\u4e32\u548c\u7b26\u5408\u6807\u8bc6\u7b26\u89c4\u5219\u7684\u5b57\u7b26\u4e32\u4ee5\u8282\u7701\u5185\u5b58\u3002\u56e0\u6b64 <code>a = \"hi\"; b = \"hi\"; a is b<\/code> \u53ef\u80fd\u4e3a <code>True<\/code>\uff0c\u4f46<strong>\u4e0d\u8981\u4f9d\u8d56 <code>is<\/code> \u6bd4\u8f83\u5b57\u7b26\u4e32\u5185\u5bb9<\/strong>\uff0c\u59cb\u7ec8\u4f7f\u7528 <code>==<\/code>\u3002<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u638c\u63e1\u5b57\u7b26\u4e32\u64cd\u4f5c\u662f Python \u5f00\u53d1\u7684\u57fa\u672c\u529f\u3002\u5982\u679c\u4f60\u5bf9<strong>\u6b63\u5219\u8868\u8fbe\u5f0f (<code>re<\/code> \u6a21\u5757)<\/strong>\u3001<strong>\u5b57\u7b26\u4e32\u6a21\u677f (<code>string.Template<\/code>)<\/strong>\uff0c\u6216<strong>\u591a\u8bed\u8a00\/\u591a\u7f16\u7801\u5904\u7406<\/strong>\u6709\u8fdb\u4e00\u6b65\u9700\u6c42\uff0c\u53ef\u4ee5\u968f\u65f6\u544a\u8bc9\u6211\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Python 3 \u4e2d\uff0c\u5b57\u7b26\u4e32 (str) \u662f\u6700\u5e38\u7528\u3001\u529f\u80fd&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-50","post","type-post","status-publish","format-standard","hentry","category-python-3-"],"_links":{"self":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/50","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/comments?post=50"}],"version-history":[{"count":1,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/50\/revisions"}],"predecessor-version":[{"id":51,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/50\/revisions\/51"}],"wp:attachment":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/media?parent=50"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/categories?post=50"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/tags?post=50"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}