{"id":1095410,"date":"2025-01-08T14:50:48","date_gmt":"2025-01-08T06:50:48","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1095410.html"},"modified":"2025-01-08T14:50:51","modified_gmt":"2025-01-08T06:50:51","slug":"python%e5%a6%82%e4%bd%95%e5%9c%a8csv%e6%96%87%e4%bb%b6%e5%90%8e%e9%9d%a2%e5%86%99%e5%85%a5%e6%95%b0%e6%8d%ae-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1095410.html","title":{"rendered":"python\u5982\u4f55\u5728csv\u6587\u4ef6\u540e\u9762\u5199\u5165\u6570\u636e"},"content":{"rendered":"

\"python\u5982\u4f55\u5728csv\u6587\u4ef6\u540e\u9762\u5199\u5165\u6570\u636e\"<\/p>\n

Python\u5728CSV\u6587\u4ef6\u540e\u9762\u5199\u5165\u6570\u636e\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u5185\u7f6e\u7684csv\u6a21\u5757\u3001pandas\u5e93\u6216\u624b\u52a8\u64cd\u4f5c\u6587\u4ef6\u3002<\/strong> \u5176\u4e2d\uff0c\u4f7f\u7528csv\u6a21\u5757\u548cpandas\u5e93\u662f\u6700\u5e38\u7528\u4e14\u9ad8\u6548\u7684\u65b9\u6cd5\u3002\u4e0b\u9762\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u53ca\u5176\u5b9e\u73b0\u6b65\u9aa4\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528csv\u6a21\u5757\u5199\u5165\u6570\u636e<\/h3>\n<\/p>\n

Python\u7684csv\u6a21\u5757\u63d0\u4f9b\u4e86\u65b9\u4fbf\u7684\u63a5\u53e3\u7528\u4e8e\u8bfb\u5199CSV\u6587\u4ef6\u3002\u901a\u8fc7\u4f7f\u7528csv.writer\u5bf9\u8c61\uff0c\u53ef\u4ee5\u8f7b\u677e\u5730\u5411CSV\u6587\u4ef6\u4e2d\u8ffd\u52a0\u6570\u636e\u3002<\/p>\n<\/p>\n

1.1\u3001\u6253\u5f00CSV\u6587\u4ef6\u5e76\u521b\u5efacsv.writer\u5bf9\u8c61<\/h4>\n<\/p>\n

\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u4ee5\u8ffd\u52a0\u6a21\u5f0f('a')\u6253\u5f00CSV\u6587\u4ef6\uff0c\u7136\u540e\u521b\u5efa\u4e00\u4e2acsv.writer\u5bf9\u8c61\u3002<\/p>\n<\/p>\n

import csv<\/p>\n
\u6253\u5f00CSV\u6587\u4ef6\uff0c\u4f7f\u7528\u8ffd\u52a0\u6a21\u5f0f<\/strong><\/h2>\n
with open('data.csv', 'a', newline='') as file:<\/p>\n
    writer = csv.writer(file)<\/p>\n
    # \u8ffd\u52a0\u6570\u636e<\/p>\n
    writer.writerow(['John', 'Doe', 28])<\/p>\n
    writer.writerow(['Jane', 'Smith', 34])<\/p>\n
<\/code><\/pre>\n<\/p>\n
1.2\u3001\u8ffd\u52a0\u591a\u884c\u6570\u636e<\/h4>\n<\/p>\n
\u5982\u679c\u9700\u8981\u8ffd\u52a0\u591a\u884c\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528writerows\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
data = [<\/p>\n
    ['Alice', 'Johnson', 25],<\/p>\n
    ['Bob', 'Brown', 45]<\/p>\n
]<\/p>\n
with open('data.csv', 'a', newline='') as file:<\/p>\n
    writer = csv.writer(file)<\/p>\n
    writer.writerows(data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/strong> csv\u6a21\u5757\u975e\u5e38\u9002\u5408\u5904\u7406\u7b80\u5355\u7684CSV\u6587\u4ef6\u3002\u5b83\u63d0\u4f9b\u4e86reader\u548cwriter\u5bf9\u8c61\uff0c\u5206\u522b\u7528\u4e8e\u8bfb\u53d6\u548c\u5199\u5165CSV\u6587\u4ef6\u3002\u4f7f\u7528csv.writer\u5bf9\u8c61\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528writerow\u65b9\u6cd5\u8ffd\u52a0\u4e00\u884c\u6570\u636e\uff0c\u4f7f\u7528writerows\u65b9\u6cd5\u8ffd\u52a0\u591a\u884c\u6570\u636e\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6253\u5f00\u6587\u4ef6\u65f6\u9700\u8981\u4f7f\u7528'a'\u6a21\u5f0f\uff08\u8ffd\u52a0\u6a21\u5f0f\uff09\uff0c\u4ee5\u786e\u4fdd\u65b0\u6570\u636e\u88ab\u6dfb\u52a0\u5230\u6587\u4ef6\u672b\u5c3e\u800c\u4e0d\u662f\u8986\u76d6\u539f\u6709\u6570\u636e\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528pandas\u5e93\u5199\u5165\u6570\u636e<\/h3>\n<\/p>\n
pandas\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u6570\u636e\u5206\u6790\u5e93\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6570\u636e\u64cd\u4f5c\u529f\u80fd\u3002\u4f7f\u7528pandas\u5e93\uff0c\u53ef\u4ee5\u66f4\u52a0\u65b9\u4fbf\u5730\u5904\u7406CSV\u6587\u4ef6\u3002<\/p>\n<\/p>\n
2.1\u3001\u8bfb\u53d6\u73b0\u6709CSV\u6587\u4ef6\u5e76\u8ffd\u52a0\u6570\u636e<\/h4>\n<\/p>\n
\u9996\u5148\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528pandas\u8bfb\u53d6\u73b0\u6709\u7684CSV\u6587\u4ef6\uff0c\u5e76\u5c06\u65b0\u6570\u636e\u8ffd\u52a0\u5230DataFrame\u4e2d\u3002<\/p>\n<\/p>\n
import pandas as pd<\/p>\n
\u8bfb\u53d6\u73b0\u6709CSV\u6587\u4ef6<\/strong><\/h2>\n
df = pd.read_csv('data.csv')<\/p>\n
\u521b\u5efa\u65b0\u7684DataFrame<\/strong><\/h2>\n
new_data = pd.DataFrame({<\/p>\n
    'FirstName': ['Alice', 'Bob'],<\/p>\n
    'LastName': ['Johnson', 'Brown'],<\/p>\n
    'Age': [25, 45]<\/p>\n
})<\/p>\n
\u8ffd\u52a0\u6570\u636e<\/strong><\/h2>\n
df = df.append(new_data, ignore_index=True)<\/p>\n
\u5199\u56deCSV\u6587\u4ef6<\/strong><\/h2>\n
df.to_csv('data.csv', index=False)<\/p>\n
<\/code><\/pre>\n<\/p>\n
2.2\u3001\u76f4\u63a5\u8ffd\u52a0\u6570\u636e\u5230CSV\u6587\u4ef6<\/h4>\n<\/p>\n
pandas\u8fd8\u63d0\u4f9b\u4e86\u76f4\u63a5\u5c06\u6570\u636e\u8ffd\u52a0\u5230CSV\u6587\u4ef6\u7684\u65b9\u6cd5\uff0c\u4f7f\u7528mode='a'\u53c2\u6570\u3002<\/p>\n<\/p>\n
new_data = pd.DataFrame({<\/p>\n
    'FirstName': ['Charlie', 'David'],<\/p>\n
    'LastName': ['White', 'Black'],<\/p>\n
    'Age': [30, 40]<\/p>\n
})<\/p>\n
\u8ffd\u52a0\u6570\u636e\u5230CSV\u6587\u4ef6<\/strong><\/h2>\n
new_data.to_csv('data.csv', mode='a', header=False, index=False)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/strong> pandas\u5e93\u7684\u4f18\u52bf\u5728\u4e8e\u5904\u7406\u590d\u6742\u7684\u6570\u636e\u64cd\u4f5c\u3002\u901a\u8fc7\u5c06CSV\u6587\u4ef6\u8bfb\u53d6\u5230DataFrame\u4e2d\uff0c\u53ef\u4ee5\u8fdb\u884c\u5404\u79cd\u6570\u636e\u5904\u7406\u64cd\u4f5c\uff0c\u7136\u540e\u518d\u5c06\u5904\u7406\u540e\u7684\u6570\u636e\u5199\u56deCSV\u6587\u4ef6\u3002\u4f7f\u7528to_csv\u65b9\u6cd5\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6emode='a'\u53c2\u6570\u5c06\u6570\u636e\u8ffd\u52a0\u5230\u6587\u4ef6\u672b\u5c3e\u3002\u6b64\u5916\uff0c\u901a\u8fc7\u8bbe\u7f6eheader=False\u53c2\u6570\uff0c\u53ef\u4ee5\u907f\u514d\u5728\u8ffd\u52a0\u6570\u636e\u65f6\u5199\u5165\u91cd\u590d\u7684\u5217\u540d\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u624b\u52a8\u64cd\u4f5c\u6587\u4ef6<\/h3>\n<\/p>\n
\u9664\u4e86\u4f7f\u7528csv\u6a21\u5757\u548cpandas\u5e93\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7\u624b\u52a8\u64cd\u4f5c\u6587\u4ef6\u6765\u5b9e\u73b0\u6570\u636e\u7684\u8ffd\u52a0\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u5408\u5904\u7406\u7279\u6b8a\u683c\u5f0f\u7684CSV\u6587\u4ef6\u3002<\/p>\n<\/p>\n
3.1\u3001\u624b\u52a8\u6253\u5f00\u6587\u4ef6\u5e76\u5199\u5165\u6570\u636e<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528Python\u7684\u5185\u7f6eopen\u51fd\u6570\u624b\u52a8\u6253\u5f00\u6587\u4ef6\uff0c\u5e76\u901a\u8fc7write\u65b9\u6cd5\u5199\u5165\u6570\u636e\u3002<\/p>\n<\/p>\n
# \u6253\u5f00\u6587\u4ef6\uff0c\u4f7f\u7528\u8ffd\u52a0\u6a21\u5f0f<\/p>\n
with open('data.csv', 'a') as file:<\/p>\n
    file.write('Eve,Green,29\\n')<\/p>\n
    file.write('Frank,Blue,37\\n')<\/p>\n
<\/code><\/pre>\n<\/p>\n
3.2\u3001\u5904\u7406\u7279\u6b8a\u683c\u5f0f\u7684CSV\u6587\u4ef6<\/h4>\n<\/p>\n
\u5982\u679cCSV\u6587\u4ef6\u6709\u7279\u6b8a\u683c\u5f0f\uff0c\u53ef\u4ee5\u624b\u52a8\u5904\u7406\u6bcf\u4e00\u884c\u6570\u636e\u5e76\u8ffd\u52a0\u3002<\/p>\n<\/p>\n
# \u6253\u5f00\u6587\u4ef6\uff0c\u4f7f\u7528\u8ffd\u52a0\u6a21\u5f0f<\/p>\n
with open('data.csv', 'a') as file:<\/p>\n
    # \u5904\u7406\u6570\u636e<\/p>\n
    data = [<\/p>\n
        ('Grace', 'Yellow', 33),<\/p>\n
        ('Henry', 'Red', 42)<\/p>\n
    ]<\/p>\n
    for first_name, last_name, age in data:<\/p>\n
        file.write(f'{first_name},{last_name},{age}\\n')<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/strong> \u624b\u52a8\u64cd\u4f5c\u6587\u4ef6\u9002\u5408\u5904\u7406\u7279\u6b8a\u683c\u5f0f\u7684CSV\u6587\u4ef6\u6216\u9700\u8981\u81ea\u5b9a\u4e49\u5199\u5165\u903b\u8f91\u7684\u573a\u666f\u3002\u901a\u8fc7\u4f7f\u7528open\u51fd\u6570\u4ee5\u8ffd\u52a0\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6\uff0c\u53ef\u4ee5\u786e\u4fdd\u65b0\u6570\u636e\u88ab\u6dfb\u52a0\u5230\u6587\u4ef6\u672b\u5c3e\u3002\u624b\u52a8\u5904\u7406\u6bcf\u4e00\u884c\u6570\u636e\u5e76\u5199\u5165\uff0c\u53ef\u4ee5\u7075\u6d3b\u5730\u5904\u7406\u5404\u79cd\u6570\u636e\u683c\u5f0f\u548c\u8981\u6c42\u3002<\/p>\n<\/p>\n
\u56db\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u6709\u591a\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5728CSV\u6587\u4ef6\u540e\u9762\u5199\u5165\u6570\u636e\u3002\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528csv\u6a21\u5757\u3001pandas\u5e93\u548c\u624b\u52a8\u64cd\u4f5c\u6587\u4ef6\u3002\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u573a\u666f\u548c\u4f18\u7f3a\u70b9\uff1a<\/p>\n<\/p>\n
1. csv\u6a21\u5757\uff1a<\/strong> \u9002\u5408\u5904\u7406\u7b80\u5355\u7684CSV\u6587\u4ef6\uff0c\u63d0\u4f9b\u4e86\u65b9\u4fbf\u7684\u63a5\u53e3\u7528\u4e8e\u8bfb\u5199CSV\u6587\u4ef6\u3002<\/p>\n<\/p>\n
2. pandas\u5e93\uff1a<\/strong> \u9002\u5408\u5904\u7406\u590d\u6742\u7684\u6570\u636e\u64cd\u4f5c\uff0c\u901a\u8fc7DataFrame\u53ef\u4ee5\u8fdb\u884c\u5404\u79cd\u6570\u636e\u5904\u7406\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
3. \u624b\u52a8\u64cd\u4f5c\u6587\u4ef6\uff1a<\/strong> \u9002\u5408\u5904\u7406\u7279\u6b8a\u683c\u5f0f\u7684CSV\u6587\u4ef6\u6216\u9700\u8981\u81ea\u5b9a\u4e49\u5199\u5165\u903b\u8f91\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
\u65e0\u8bba\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\uff0c\u90fd\u9700\u8981\u786e\u4fdd\u6253\u5f00\u6587\u4ef6\u65f6\u4f7f\u7528\u8ffd\u52a0\u6a21\u5f0f('a')\uff0c\u4ee5\u786e\u4fdd\u65b0\u6570\u636e\u88ab\u6b63\u786e\u5730\u8ffd\u52a0\u5230\u6587\u4ef6\u672b\u5c3e\u3002\u901a\u8fc7\u9009\u62e9\u9002\u5f53\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u9ad8\u6548\u5730\u5728CSV\u6587\u4ef6\u540e\u9762\u5199\u5165\u6570\u636e\uff0c\u6ee1\u8db3\u4e0d\u540c\u5e94\u7528\u573a\u666f\u7684\u9700\u6c42\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u6253\u5f00\u5e76\u8bfb\u53d6CSV\u6587\u4ef6\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u4f7f\u7528\u5185\u7f6e\u7684csv<\/code>\u6a21\u5757\u53ef\u4ee5\u65b9\u4fbf\u5730\u6253\u5f00\u548c\u8bfb\u53d6CSV\u6587\u4ef6\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528csv.reader()<\/code>\u51fd\u6570\u6765\u8bfb\u53d6\u6587\u4ef6\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
import csv\n\nwith open('your_file.csv', mode='r', newline='') as file:\n    reader = csv.reader(file)\n    for row in reader:\n        print(row)\n<\/code><\/pre>\n
\u8fd9\u6bb5\u4ee3\u7801\u4f1a\u9010\u884c\u8bfb\u53d6CSV\u6587\u4ef6\uff0c\u5e76\u5c06\u6bcf\u4e00\u884c\u4f5c\u4e3a\u5217\u8868\u6253\u5370\u51fa\u6765\u3002<\/p>\n
\u5728\u5199\u5165\u6570\u636e\u5230CSV\u6587\u4ef6\u65f6\uff0c\u662f\u5426\u4f1a\u8986\u76d6\u539f\u6709\u6570\u636e\uff1f<\/strong>
\u5f53\u4f7f\u7528mode='a'<\/code>\u6253\u5f00CSV\u6587\u4ef6\u65f6\uff0c\u6570\u636e\u4f1a\u88ab\u9644\u52a0\u5230\u6587\u4ef6\u672b\u5c3e\uff0c\u800c\u4e0d\u4f1a\u8986\u76d6\u539f\u6709\u6570\u636e\u3002\u5982\u679c\u5e0c\u671b\u8986\u76d6\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\uff0c\u53ef\u4ee5\u4f7f\u7528mode='w'<\/code>\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u5c06\u65b0\u6570\u636e\u9644\u52a0\u5230\u73b0\u6709CSV\u6587\u4ef6\u4e2d\uff1a<\/p>\n
import csv\n\nwith open('your_file.csv', mode='a', newline='') as file:\n    writer = csv.writer(file)\n    writer.writerow(['\u65b0\u6570\u636e1', '\u65b0\u6570\u636e2', '\u65b0\u6570\u636e3'])\n<\/code><\/pre>\n
\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u7075\u6d3b\u5730\u9009\u62e9\u662f\u8986\u76d6\u8fd8\u662f\u8ffd\u52a0\u6570\u636e\u3002<\/p>\n
\u5982\u4f55\u786e\u4fdd\u5199\u5165CSV\u6587\u4ef6\u7684\u6570\u636e\u683c\u5f0f\u6b63\u786e\uff1f<\/strong>
\u5728\u5199\u5165CSV\u6587\u4ef6\u4e4b\u524d\uff0c\u786e\u4fdd\u6570\u636e\u5df2\u7ecf\u88ab\u683c\u5f0f\u5316\u4e3a\u5217\u8868\u6216\u5b57\u5178\uff0c\u4ee5\u4fbf\u4e8e\u4f7f\u7528csv.writer()<\/code>\u8fdb\u884c\u5199\u5165\u3002\u82e5\u8981\u5199\u5165\u5b57\u5178\u683c\u5f0f\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528csv.DictWriter()<\/code>\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
import csv\n\ndata = [{'\u52171': '\u503c1', '\u52172': '\u503c2'}, {'\u52171': '\u503c3', '\u52172': '\u503c4'}]\n\nwith open('your_file.csv', mode='a', newline='') as file:\n    writer = csv.DictWriter(file, fieldnames=data[0].keys())\n    writer.writeheader()  # \u5199\u5165\u8868\u5934\n    writer.writerows(data)  # \u5199\u5165\u591a\u884c\u6570\u636e\n<\/code><\/pre>\n
\u786e\u4fdd\u5b57\u6bb5\u540d\u548c\u6570\u636e\u7684\u5bf9\u5e94\u5173\u7cfb\u6e05\u6670\uff0c\u4ee5\u907f\u514d\u5199\u5165\u9519\u8bef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u5728CSV\u6587\u4ef6\u540e\u9762\u5199\u5165\u6570\u636e\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u5185\u7f6e\u7684csv\u6a21\u5757\u3001pandas\u5e93\u6216\u624b\u52a8\u64cd\u4f5c […]","protected":false},"author":3,"featured_media":1095416,"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\/1095410"}],"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=1095410"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1095410\/revisions"}],"predecessor-version":[{"id":1095417,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1095410\/revisions\/1095417"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1095416"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1095410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1095410"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1095410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}