{"id":85470,"date":"2021-08-17T12:20:43","date_gmt":"2021-08-17T04:20:43","guid":{"rendered":"http:\/\/www.zhushiyao.com\/?p=85470"},"modified":"2021-08-17T12:21:12","modified_gmt":"2021-08-17T04:21:12","slug":"f354165777","status":"publish","type":"post","link":"http:\/\/www.zhushiyao.com\/?p=85470","title":{"rendered":"\u6b63\u786e\u4f7f\u7528Python f-string\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u76847\u4e2a\u5c42\u7ea7"},"content":{"rendered":"
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f-string\u662fPython 3.6\u63a8\u51fa\u7684\u4e00\u79cd\u7b80\u5355\u800c\u4e0d\u540c\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u6280\u672f\uff0c\u53ef\u4ee5\u4f18\u96c5\u5730\u8868\u8fbePython\u5b57\u7b26\u4e32\u3002\u9664\u975e\u60a8\u4ecd\u5728\u4f7f\u7528\u65e7\u7684 Python \u7248\u672c\uff0c\u5426\u5219\u5728\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65f6\uff0cf \u5b57\u7b26\u4e32\u7edd\u5bf9\u5e94\u8be5\u662f\u60a8\u7684\u9996\u9009\u3002\u56e0\u4e3a\u5b83\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e2a\u8ff7\u4f60\u8bed\u6cd5\u6ee1\u8db3\u60a8\u7684\u6240\u6709\u8981\u6c42\uff0c\u751a\u81f3\u8fd0\u884c\u5b57\u7b26\u4e32\u7684\u8868\u8fbe\u5f0f\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8\u8fd9\u9879\u6280\u672f\u4ece\u521d\u7ea7\u5230\u6df1\u5ea6\u76847\u4e2a\u5c42\u6b21\u3002\u5728\u4e86\u89e3\u5b83\u4eec\u4e4b\u540e\uff0c\u60a8\u53ef\u80fd\u4f1a\u6210\u4e3a\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u5927\u5e08\u3002<\/span><\/p>\n

\"\u6b63\u786e\u4f7f\u7528Python<\/p>\n

\u00a0<\/span><\/p>\n

1. \u8f7b\u677e\u4ece\u53d8\u91cf\u663e\u793a\u503c<\/span><\/strong><\/span><\/h1>\n

\u4f7f\u7528 f \u5b57\u7b26\u4e32\u53ea\u9700\u8981\u505a\u4e24\u4ef6\u4e8b\uff1a<\/span><\/p>\n

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  • \u5728\u5b57\u7b26\u4e32\u524d\u6dfb\u52a0\u4e00\u4e2a\u5c0f\u5199\u7684<\/span>f<\/span>;<\/span><\/li>\n
  • \u4f7f\u7528f\u5b57\u7b26\u4e32\u4e2d\u4ee5<\/span>{variable_name}<\/span>\u63d2\u503c\u53d8\u91cf.<\/span><\/li>\n<\/ul>\n
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      name\u00a0=\u00a0'Yang'<\/span><\/code>title = 'full stack hacker'<\/span><\/code>print(f'{name} is a {title}.')<\/span><\/code>#\u00a0Yang\u00a0is\u00a0a\u00a0full\u00a0stack\u00a0hacker.<\/span><\/code><\/pre>\n<\/section>\n
      \u5982\u4e0a\u6240\u793a\uff0c\u5728 f \u5b57\u7b26\u4e32\u673a\u5236\u7684\u5e2e\u52a9\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u7b80\u5355\u4e14\u66f4\u5c11\u7684\u4ee3\u7801\uff0c\u4ee5\u4fbf\u5728\u5b57\u7b26\u4e32\u4e2d\u663e\u793a\u66f4\u591a\u4ee3\u7801\u3002\u5b83\u5b8c\u7f8e\u5730\u547c\u5e94\u4e86 Python \u7684\u7985\u5b97\u3002<\/span><\/p>\n
      “\u7b80\u5355\u603b\u6bd4\u590d\u6742\u597d\u3002<\/span><\/p><\/blockquote>\n
      2. \u6570\u5b57\u683c\u5f0f\u5316<\/span><\/strong><\/h1>\n
      \u6709\u65f6\u4ec5\u4ec5\u663e\u793a\u539f\u59cb\u503c\u53ef\u80fd\u65e0\u6cd5\u6ee1\u8db3\u6211\u4eec\u7684\u9700\u6c42\uff0c\u4f46\u662f\u76f4\u63a5\u4fee\u6539\u539f\u59cb\u53d8\u91cf\u901a\u5e38\u4e0d\u662f\u4e2a\u597d\u4e3b\u610f\uff0c\u56e0\u4e3a\u53d8\u91cf\u53ef\u80fd\u5728\u5176\u4ed6\u5730\u65b9\u4f7f\u7528\u3002<\/span>\u4e0d\u7528\u62c5\u5fc3\uff0cPython f\u5b57\u7b26\u4e32\u8fd8\u652f\u6301”\u683c\u5f0f\u89c4\u8303\u8ff7\u4f60\u8bed\u8a00”\uff0c\u5b83\u4f7f\u6211\u4eec\u80fd\u591f\u6839\u636e\u81ea\u5df1\u559c\u6b22\u7684\u65b9\u5f0f\u5728 f \u5b57\u7b26\u4e32\u4e2d\u683c\u5f0f\u5316\u503c\uff0c\u5c24\u5176\u662f\u6570\u5b57\u3002<\/span><\/p>\n
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        pi = 3.1415926<\/span><\/code>print(f'Pi is approximately equal to {pi:.2f}')<\/span><\/code># Pi is approximately equal to 3.14<\/span><\/code>\n<\/span><\/code>id = 1  # need to print a 3-digit number<\/span><\/code>print(f\"The id is {id:03d}\")<\/span><\/code># The id is 001<\/span><\/code>\n<\/span><\/code>N = 1000000000  # need to add separator<\/span><\/code>print(f'His networth is ${N:,d}')<\/span><\/code># His networth is $1,000,000,000<\/span><\/code><\/pre>\n<\/section>\n
        \u4ee5\u4e0a\u793a\u4f8b\u4ec5\u663e\u793a\u4e86\u51b0\u5c71\u4e00\u89d2\u3002\u5bf9\u4e8e\u683c\u5f0f\u89c4\u683c\u8bed\u6cd5\u7684\u5b8c\u6574\u5217\u8868\uff0c\u76f8\u5e94\u7684\u5b98\u65b9\u6587\u6863\u662f\u60a8\u6700\u597d\u7684\u670b\u53cb\u3002<\/span><\/p>\n
        3. \u6b63\u786e\u6253\u5370\u7279\u6b8a\u5b57\u7b26<\/span><\/strong><\/span><\/h1>\n
        \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 f \u5b57\u7b26\u4e32\u6253\u5370\u8fd9\u4e9b\u5b57\u7b26\u6216\u5176\u4ed6\u7279\u6b8a\u5b57\u7b26\u5417\uff1f\u6bd4\u5982<\/span>”<\/span>\u548c<\/span>{}<\/span>\u3002<\/span>\u662f\u7684\uff0c\u5f53\u7136\u3002\u4f46\u8bed\u6cd5\u6709\u70b9\u68d8\u624b\u3002\u8ba9\u6211\u4eec\u6765\u770b\u770b\u3002<\/span><\/p>\n
        \u00a0<\/span><\/p>\n
        3.1 \u6253\u5370\u5f15\u53f7<\/span><\/h2>\n
        \u6b63\u5982\u6211\u4eec\u6240\u77e5\uff0c\u53cd\u659c\u7ebf\u662f\u5e38\u7528\u7684\u8f6c\u4e49\u5b57\u7b26\uff0c\u7528\u4e8e\u8c03\u7528\u5bf9\u5176\u4ee5\u4e0b\u5b57\u7b26\u7684\u66ff\u4ee3\u89e3\u91ca\u3002\u5bf9\u4e8e f \u5b57\u7b26\u4e32\uff0c\u6211\u4eec\u9700\u8981\u6ce8\u610f\u4e00\u6761\u89c4\u5219\uff1a<\/span>\u5728 f \u5b57\u7b26\u4e32\u8868\u8fbe\u5f0f\u7684\u62ec\u53f7{}\u4e2d\u4e0d\u8d77\u4f5c\u7528<\/span>\u3002<\/span><\/p>\n
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          name = 'Yang'<\/span><\/code># Correct Way:<\/span><\/code>print(f''{name}' is a full stack hacker.')<\/span><\/code># 'Yang' is a full stack hacker.<\/span><\/code>\n<\/span><\/code># \u9519\u8bef\u65b9\u5f0f:<\/span><\/code>print(f'{'name'} is a full stack hacker.')<\/span><\/code># SyntaxError: f-string expression part cannot include a backslash<\/span><\/code><\/pre>\n<\/section>\n
          3.2 \u6253\u5370\u53cc\u62ec\u53f7{}<\/span><\/h2>\n
          \u7528 f\u5b57\u7b26\u4e32\u6253\u5370{}\u7684\u65b9\u6cd5\u662f\u4e0d\u540c\u7684, \u975e\u5e38\u5bb9\u6613\u51fabug\u3002\u8fd9\u6b21\u6211\u4eec\u4e0d\u80fd\u4f7f\u7528\u53cd\u659c\u7ebf\u3002<\/span><\/p>\n
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            name = 'Yang'<\/span><\/code>\n<\/span><\/code># 1<\/span><\/code>print(f'{name} is a full stack hacker.')<\/span><\/code># 'Yang' is a full stack hacker.<\/span><\/code>\n<\/span><\/code># 2<\/span><\/code>print(f'{{name}} is a full stack hacker.')<\/span><\/code># {name} is a full stack hacker.<\/span><\/code>\n<\/span><\/code># 3<\/span><\/code>print(f'{{{name}}} is a full stack hacker.')<\/span><\/code># {Yang} is a full stack hacker.<\/span><\/code>\n<\/span><\/code># 4<\/span><\/code>print(f'{{{{name}}}} is a full stack hacker.')<\/span><\/code># {{name}} is a full stack hacker.<\/span><\/code>\n<\/span><\/code># 5<\/span><\/code>print(f'{{{{{name}}}}} is a full stack hacker.')<\/span><\/code># {{Yang}} is a full stack hacker.<\/span><\/code><\/pre>\n<\/section>\n
            \u5982\u4e0a\u4f8b\u6240\u793a\uff0c\u8be5\u53d8\u91cf\u662f\u4f5c\u4e3af-\u5b57\u7b26\u4e32\u7684\u62ec\u53f7\u8fd8\u662f\u53d8\u91cf\u5904\u7406\u53d6\u51b3\u4e8e\u5176\u5468\u56f4\u7684\u62ec\u53f7\u6570\u3002\u5982\u679c\u60a8\u4e0d\u77e5\u9053\u8fd9\u79cd\u5947\u602a\u7684\u673a\u5236\uff0c\u5219\u5bb9\u6613\u51fa\u73b0\u9519\u8bef\u3002<\/span><\/p>\n
            \u00a0<\/span><\/p>\n
            3.3 \u6253\u5370\u53cd\u659c\u7ebf<\/span><\/h2>\n
            \u6253\u5370\u53cd\u659c\u7ebf<\/span>\u5f88\u7b80\u5355\uff1a<\/span>\u53ea\u9700\u4f7f\u7528\u53cc\u53cd\u659c\u7ebf\u6253\u5370<\/span>\u3002\u4f46\u662f\u4e0d\u8981\u5c06\u5b83\u4eec\u6dfb\u52a0\u5230 f \u5b57\u7b26\u4e32\u8868\u8fbe\u5f0f\u62ec\u53f7\u5f53\u4e2d\u3002<\/span><\/p>\n
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              name = 'Yang'<\/span><\/code>\n<\/span><\/code>print(f'\\{name}\\ is a full \\stack hacker.')<\/span><\/code># Yang is a full stack hacker.<\/span><\/code>\n<\/span><\/code>#\u9519\u8bef\u7684<\/span><\/code>print(f'{\\name\\} is a full \\stack hacker.')<\/span><\/code># SyntaxError: f-string expression part cannot include a backslash<\/span><\/code><\/pre>\n<\/section>\n
              4. \u5c0f\u5fc3\u6253\u5370\u5b57\u5178\u503c<\/span><\/strong><\/span><\/h1>\n
              \u5c06\u5b57\u5178\u7684\u503c\u5e94\u7528\u5230 f \u5b57\u7b26\u4e32\u4e2d\u4e5f\u5bb9\u6613\u51fa\u73b0\u9519\u8bef\u3002\u6211\u4eec\u5fc5\u987b\u4f7f\u7528\u4e0d\u540c\u7684\u5f15\u53f7\u6765\u63cf\u8ff0\u5b57\u5178\u952e\u548c f \u5b57\u7b26\u4e32\uff0c\u5982\u4e0b\u6240\u793a\u3002\u5982\u679cf\u5b57\u7b26\u4e32\u7528\u53cc\u5f15\u53f7\u8868\u793a\uff0c\u90a3\u4e48\u53d8\u91cf\u91cc\u7684\u5b57\u5178\u952e\u5fc5\u987b\u7528\u5355\u5f15\u53f7\u3002<\/span><\/p>\n
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