{"id":963303,"date":"2024-12-27T04:16:38","date_gmt":"2024-12-26T20:16:38","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/963303.html"},"modified":"2024-12-27T04:16:40","modified_gmt":"2024-12-26T20:16:40","slug":"python%e5%a6%82%e4%bd%95%e5%bc%95%e7%94%a8csv%e6%a8%a1%e5%9d%97","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/963303.html","title":{"rendered":"python\u5982\u4f55\u5f15\u7528csv\u6a21\u5757"},"content":{"rendered":"

\"python\u5982\u4f55\u5f15\u7528csv\u6a21\u5757\"<\/p>\n

Python\u4e2d\u5f15\u7528CSV\u6a21\u5757\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528\u5185\u7f6ecsv\u6a21\u5757\u3001\u4f7f\u7528pandas\u5e93\u3001\u4f7f\u7528numpy\u5e93\u3002<\/strong>\u5176\u4e2d\uff0c\u4f7f\u7528\u5185\u7f6ecsv\u6a21\u5757<\/strong>\u662f\u6700\u4e3a\u5e38\u89c1\u7684\u65b9\u6cd5\uff0c\u5b83\u63d0\u4f9b\u4e86\u7b80\u5355\u76f4\u63a5\u7684\u63a5\u53e3\u6765\u5904\u7406CSV\u6587\u4ef6\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528\u5185\u7f6ecsv\u6a21\u5757\u6765\u8bfb\u53d6\u548c\u5199\u5165CSV\u6587\u4ef6\uff0c\u5e76\u4ecb\u7ecd\u5176\u4ed6\u4e24\u79cd\u65b9\u6cd5\u7684\u57fa\u672c\u7528\u6cd5\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528CSV\u6a21\u5757\u8bfb\u53d6\u6587\u4ef6<\/p>\n<\/p>\n

Python\u5185\u7f6e\u7684csv\u6a21\u5757\u662f\u5904\u7406CSV\u6587\u4ef6\u7684\u5f3a\u5927\u5de5\u5177\u3002\u4f7f\u7528\u5b83\u53ef\u4ee5\u8f7b\u677e\u5730\u8bfb\u5199CSV\u6587\u4ef6\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528csv\u6a21\u5757\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u6b65\u9aa4\uff1a<\/p>\n<\/p>\n

    \n
  1. \n

    \u5bfc\u5165csv\u6a21\u5757<\/strong><\/p>\n<\/p>\n

    \u5728Python\u4e2d\uff0c\u9996\u5148\u9700\u8981\u5bfc\u5165csv\u6a21\u5757\u3002\u901a\u8fc7import\u8bed\u53e5\u5bfc\u5165\uff1a<\/p>\n<\/p>\n

    import csv<\/p>\n
    <\/code><\/pre>\n<\/p>\n<\/li>\n
  2. \n
    \u8bfb\u53d6CSV\u6587\u4ef6<\/strong><\/p>\n<\/p>\n
    \u4f7f\u7528csv.reader\u5bf9\u8c61\u6765\u8bfb\u53d6CSV\u6587\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
    with open('example.csv', mode='r') as file:<\/p>\n
        csv_reader = csv.reader(file)<\/p>\n
        for row in csv_reader:<\/p>\n
            print(row)<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0copen()<\/code>\u51fd\u6570\u4ee5\u8bfb\u53d6\u6a21\u5f0f\u6253\u5f00\u4e86\u4e00\u4e2a\u540d\u4e3aexample.csv<\/code>\u7684\u6587\u4ef6\uff0c\u7136\u540e\u4f7f\u7528csv.reader()<\/code>\u521b\u5efa\u4e00\u4e2acsv_reader\u5bf9\u8c61\u6765\u9010\u884c\u8bfb\u53d6\u6587\u4ef6\u3002<\/p>\n<\/p>\n<\/li>\n
  3. \n
    \u5904\u7406CSV\u6570\u636e<\/strong><\/p>\n<\/p>\n
    \u4f7f\u7528csv\u6a21\u5757\u53ef\u4ee5\u65b9\u4fbf\u5730\u5904\u7406CSV\u6570\u636e\uff0c\u4f8b\u5982\u5c06\u5176\u8f6c\u6362\u4e3a\u5217\u8868\u6216\u5b57\u5178\u3002\u4ee5\u4e0b\u662f\u5c06CSV\u6570\u636e\u8f6c\u6362\u4e3a\u5b57\u5178\u7684\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
    with open('example.csv', mode='r') as file:<\/p>\n
        csv_reader = csv.DictReader(file)<\/p>\n
        for row in csv_reader:<\/p>\n
            print(row['column_name'])<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    csv.DictReader<\/code>\u5c06\u6bcf\u884c\u8f6c\u6362\u4e3a\u4e00\u4e2a\u5b57\u5178\uff0c\u952e\u662f\u5217\u540d\uff0c\u503c\u662f\u5355\u5143\u683c\u5185\u5bb9\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
    \u4e8c\u3001\u4f7f\u7528CSV\u6a21\u5757\u5199\u5165\u6587\u4ef6<\/p>\n<\/p>\n
    \u9664\u4e86\u8bfb\u53d6\uff0ccsv\u6a21\u5757\u8fd8\u53ef\u4ee5\u7528\u6765\u5199\u5165CSV\u6587\u4ef6\u3002\u4ee5\u4e0b\u662f\u5199\u5165CSV\u6587\u4ef6\u7684\u6b65\u9aa4\uff1a<\/p>\n<\/p>\n
      \n
    1. \n
      \u521b\u5efaCSV\u6587\u4ef6<\/strong><\/p>\n<\/p>\n
      \u4f7f\u7528csv.writer\u5bf9\u8c61\u6765\u5199\u5165CSV\u6587\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
      with open('output.csv', mode='w', newline='') as file:<\/p>\n
          csv_writer = csv.writer(file)<\/p>\n
          csv_writer.writerow(['column1', 'column2', 'column3'])<\/p>\n
          csv_writer.writerow(['value1', 'value2', 'value3'])<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0copen()<\/code>\u51fd\u6570\u4ee5\u5199\u5165\u6a21\u5f0f\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3aoutput.csv<\/code>\u7684\u6587\u4ef6\uff0c\u7136\u540e\u4f7f\u7528csv.writer()<\/code>\u521b\u5efa\u4e00\u4e2acsv_writer\u5bf9\u8c61\u6765\u5199\u5165\u6587\u4ef6\u3002<\/p>\n<\/p>\n<\/li>\n
    2. \n
      \u5199\u5165\u591a\u884c<\/strong><\/p>\n<\/p>\n
      \u53ef\u4ee5\u4f7f\u7528writerows()<\/code>\u65b9\u6cd5\u4e00\u6b21\u6027\u5199\u5165\u591a\u884c\u6570\u636e\uff1a<\/p>\n<\/p>\n
      data = [<\/p>\n
          ['column1', 'column2', 'column3'],<\/p>\n
          ['value1', 'value2', 'value3'],<\/p>\n
          ['value4', 'value5', 'value6']<\/p>\n
      ]<\/p>\n
      with open('output.csv', mode='w', newline='') as file:<\/p>\n
          csv_writer = csv.writer(file)<\/p>\n
          csv_writer.writerows(data)<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u8fd9\u79cd\u65b9\u6cd5\u5bf9\u4e8e\u9700\u8981\u5199\u5165\u5927\u91cf\u6570\u636e\u7684\u60c5\u51b5\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
      \u4e09\u3001\u4f7f\u7528Pandas\u5e93<\/p>\n<\/p>\n
      Pandas\u662f\u4e00\u4e2a\u6570\u636e\u5206\u6790\u7684\u5f3a\u5927\u5e93\uff0c\u5b83\u63d0\u4f9b\u4e86\u66f4\u4e3a\u9ad8\u7ea7\u7684CSV\u6587\u4ef6\u5904\u7406\u529f\u80fd\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528Pandas\u5e93\u8bfb\u53d6\u548c\u5199\u5165CSV\u6587\u4ef6\u7684\u6b65\u9aa4\uff1a<\/p>\n<\/p>\n
        \n
      1. \n
        \u5b89\u88c5Pandas\u5e93<\/strong><\/p>\n<\/p>\n
        \u5982\u679c\u4f60\u8fd8\u6ca1\u6709\u5b89\u88c5Pandas\u5e93\uff0c\u53ef\u4ee5\u4f7f\u7528pip\u8fdb\u884c\u5b89\u88c5\uff1a<\/p>\n<\/p>\n
        pip install pandas<\/p>\n
        <\/code><\/pre>\n<\/p>\n<\/li>\n
      2. \n
        \u4f7f\u7528Pandas\u8bfb\u53d6CSV\u6587\u4ef6<\/strong><\/p>\n<\/p>\n
        Pandas\u63d0\u4f9b\u4e86read_csv()<\/code>\u51fd\u6570\u6765\u8bfb\u53d6CSV\u6587\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
        import pandas as pd<\/p>\n
        df = pd.read_csv('example.csv')<\/p>\n
        print(df.head())<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        read_csv()<\/code>\u51fd\u6570\u8fd4\u56de\u4e00\u4e2aDataFrame\u5bf9\u8c61\uff0c\u8fd9\u662fPandas\u7528\u4e8e\u5b58\u50a8\u6570\u636e\u7684\u4e3b\u8981\u7ed3\u6784\u3002head()<\/code>\u65b9\u6cd5\u7528\u4e8e\u663e\u793a\u524d\u51e0\u884c\u6570\u636e\u3002<\/p>\n<\/p>\n<\/li>\n
      3. \n
        \u4f7f\u7528Pandas\u5199\u5165CSV\u6587\u4ef6<\/strong><\/p>\n<\/p>\n
        \u53ef\u4ee5\u4f7f\u7528to_csv()<\/code>\u65b9\u6cd5\u5c06DataFrame\u5199\u5165CSV\u6587\u4ef6\uff1a<\/p>\n<\/p>\n
        df.to_csv('output.csv', index=False)<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        index=False<\/code>\u53c2\u6570\u7528\u4e8e\u907f\u514d\u5199\u5165\u884c\u7d22\u5f15\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
        \u56db\u3001\u4f7f\u7528Numpy\u5e93<\/p>\n<\/p>\n
        Numpy\u662f\u53e6\u4e00\u4e2a\u5f3a\u5927\u7684\u6570\u636e\u5904\u7406\u5e93\uff0c\u867d\u7136\u5b83\u4e0d\u5982Pandas\u76f4\u89c2\uff0c\u4f46\u5bf9\u4e8e\u5904\u7406\u6570\u503c\u6570\u636e\u975e\u5e38\u6709\u6548\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528Numpy\u5e93\u8bfb\u53d6\u548c\u5199\u5165CSV\u6587\u4ef6\u7684\u6b65\u9aa4\uff1a<\/p>\n<\/p>\n
          \n
        1. \n
          \u5b89\u88c5Numpy\u5e93<\/strong><\/p>\n<\/p>\n
          \u5982\u679c\u4f60\u8fd8\u6ca1\u6709\u5b89\u88c5Numpy\u5e93\uff0c\u53ef\u4ee5\u4f7f\u7528pip\u8fdb\u884c\u5b89\u88c5\uff1a<\/p>\n<\/p>\n
          pip install numpy<\/p>\n
          <\/code><\/pre>\n<\/p>\n<\/li>\n
        2. \n
          \u4f7f\u7528Numpy\u8bfb\u53d6CSV\u6587\u4ef6<\/strong><\/p>\n<\/p>\n
          Numpy\u63d0\u4f9b\u4e86genfromtxt()<\/code>\u51fd\u6570\u6765\u8bfb\u53d6CSV\u6587\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
          import numpy as np<\/p>\n
          data = np.genfromtxt('example.csv', delimiter=',')<\/p>\n
          print(data)<\/p>\n
          <\/code><\/pre>\n<\/p>\n
          genfromtxt()<\/code>\u51fd\u6570\u8fd4\u56de\u4e00\u4e2aNumpy\u6570\u7ec4\u3002<\/p>\n<\/p>\n<\/li>\n
        3. \n
          \u4f7f\u7528Numpy\u5199\u5165CSV\u6587\u4ef6<\/strong><\/p>\n<\/p>\n
          \u53ef\u4ee5\u4f7f\u7528savetxt()<\/code>\u51fd\u6570\u5c06Numpy\u6570\u7ec4\u5199\u5165CSV\u6587\u4ef6\uff1a<\/p>\n<\/p>\n
          np.savetxt('output.csv', data, delimiter=',')<\/p>\n
          <\/code><\/pre>\n<\/p>\n
          delimiter=','<\/code>\u53c2\u6570\u7528\u4e8e\u6307\u5b9a\u5206\u9694\u7b26\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
          \u4e94\u3001\u603b\u7ed3<\/p>\n<\/p>\n
          Python\u63d0\u4f9b\u4e86\u591a\u79cd\u5904\u7406CSV\u6587\u4ef6\u7684\u65b9\u6cd5\u3002csv\u6a21\u5757<\/strong>\u662fPython\u6807\u51c6\u5e93\u7684\u4e00\u90e8\u5206\uff0c\u975e\u5e38\u9002\u5408\u5904\u7406\u7b80\u5355\u7684CSV\u6587\u4ef6\u3002Pandas\u5e93<\/strong>\u63d0\u4f9b\u4e86\u66f4\u4e3a\u9ad8\u7ea7\u7684\u529f\u80fd\uff0c\u9002\u5408\u9700\u8981\u8fdb\u884c\u590d\u6742\u6570\u636e\u5206\u6790\u7684\u60c5\u51b5\u3002\u800cNumpy\u5e93<\/strong>\u975e\u5e38\u9002\u5408\u5904\u7406\u6570\u503c\u6570\u636e\u3002\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u4f60\u7684\u5177\u4f53\u9700\u6c42\u548c\u6570\u636e\u590d\u6742\u6027\u3002\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u591f\u5e2e\u52a9\u4f60\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528Python\u5904\u7406CSV\u6587\u4ef6\u3002<\/p>\n<\/p>\n
          \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
           \u5982\u4f55\u5728Python\u4e2d\u5bfc\u5165csv\u6a21\u5757\uff1f<\/strong>
          \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u5728\u4ee3\u7801\u7684\u5f00\u5934\u4f7f\u7528import csv<\/code>\u8bed\u53e5\u6765\u5bfc\u5165csv\u6a21\u5757\u3002\u8fd9\u5c06\u5141\u8bb8\u60a8\u4f7f\u7528\u8be5\u6a21\u5757\u4e2d\u7684\u529f\u80fd\u6765\u8bfb\u53d6\u548c\u5199\u5165CSV\u6587\u4ef6\u3002\u786e\u4fdd\u60a8\u7684Python\u73af\u5883\u5df2\u7ecf\u6b63\u786e\u5b89\u88c5\uff0c\u5e76\u4e14\u60a8\u80fd\u591f\u8bbf\u95eecsv\u6a21\u5757\u3002<\/p>\n
          \u4f7f\u7528csv\u6a21\u5757\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u6b65\u9aa4\u662f\u4ec0\u4e48\uff1f<\/strong>
          \u8981\u4f7f\u7528csv\u6a21\u5757\u8bfb\u53d6CSV\u6587\u4ef6\uff0c\u53ef\u4ee5\u4f7f\u7528csv.reader()<\/code>\u51fd\u6570\u3002\u9996\u5148\uff0c\u60a8\u9700\u8981\u6253\u5f00\u6587\u4ef6\uff0c\u7136\u540e\u5c06\u5176\u4f20\u9012\u7ed9csv.reader()<\/code>\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a  <\/p>\n
          import csv\n\nwith open('\u6587\u4ef6\u540d.csv', mode='r', newline='') as file:\n    reader = csv.reader(file)\n    for row in reader:\n        print(row)\n<\/code><\/pre>\n
          \u8fd9\u6837\uff0c\u60a8\u5c31\u53ef\u4ee5\u9010\u884c\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u5185\u5bb9\u3002<\/p>\n
          \u5982\u4f55\u4f7f\u7528csv\u6a21\u5757\u5199\u5165CSV\u6587\u4ef6\uff1f<\/strong>
          \u4f7f\u7528csv\u6a21\u5757\u5199\u5165CSV\u6587\u4ef6\u4e5f\u5f88\u7b80\u5355\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528csv.writer()<\/code>\u51fd\u6570\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff1a  <\/p>\n
          import csv\n\nwith open('\u8f93\u51fa\u6587\u4ef6\u540d.csv', mode='w', newline='') as file:\n    writer = csv.writer(file)\n    writer.writerow(['\u52171', '\u52172', '\u52173'])  # \u5199\u5165\u6807\u9898\u884c\n    writer.writerow(['\u6570\u636e1', '\u6570\u636e2', '\u6570\u636e3'])  # \u5199\u5165\u6570\u636e\u884c\n<\/code><\/pre>\n
          \u4e0a\u8ff0\u4ee3\u7801\u5c06\u521b\u5efa\u4e00\u4e2a\u65b0CSV\u6587\u4ef6\uff0c\u5e76\u5199\u5165\u6807\u9898\u548c\u4e00\u884c\u6570\u636e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u4e2d\u5f15\u7528CSV\u6a21\u5757\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528\u5185\u7f6ecsv\u6a21\u5757\u3001\u4f7f\u7528pandas\u5e93\u3001\u4f7f\u7528numpy\u5e93\u3002\u5176\u4e2d\uff0c\u4f7f\u7528\u5185\u7f6e […]","protected":false},"author":3,"featured_media":963308,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/963303"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=963303"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/963303\/revisions"}],"predecessor-version":[{"id":963312,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/963303\/revisions\/963312"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/963308"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=963303"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=963303"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=963303"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}