{"id":1066054,"date":"2024-12-31T16:22:54","date_gmt":"2024-12-31T08:22:54","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1066054.html"},"modified":"2024-12-31T16:22:56","modified_gmt":"2024-12-31T08:22:56","slug":"python3%e8%af%bb%e5%8f%96csv%e6%96%87%e4%bb%b6%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1066054.html","title":{"rendered":"python3\u8bfb\u53d6csv\u6587\u4ef6\u5982\u4f55\u4f7f\u7528"},"content":{"rendered":"

\"python3\u8bfb\u53d6csv\u6587\u4ef6\u5982\u4f55\u4f7f\u7528\"<\/p>\n

Python3\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u65b9\u6cd5\u6709\u591a\u79cd<\/strong>\uff0c\u5982\u4f7f\u7528\u5185\u7f6e\u7684csv<\/code>\u6a21\u5757\u3001\u4f7f\u7528pandas<\/code>\u5e93\u3001\u4f7f\u7528numpy<\/code>\u5e93\u7b49\u3002\u63a8\u8350\u4f7f\u7528pandas<\/code>\u5e93\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4ec5\u529f\u80fd\u5f3a\u5927\uff0c\u8fd8\u63d0\u4f9b\u4e86\u7b80\u5355\u6613\u7528\u7684\u63a5\u53e3<\/strong>\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u51e0\u79cd\u65b9\u6cd5\uff0c\u5e76\u8ba8\u8bba\u5b83\u4eec\u7684\u4f18\u7f3a\u70b9\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u5185\u7f6e\u7684csv\u6a21\u5757<\/h3>\n<\/p>\n

Python3\u5185\u7f6e\u7684csv<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u57fa\u7840\u7684CSV\u6587\u4ef6\u8bfb\u53d6\u548c\u5199\u5165\u529f\u80fd\u3002\u5b83\u9002\u7528\u4e8e\u7b80\u5355\u7684CSV\u6587\u4ef6\u5904\u7406\u4efb\u52a1\u3002<\/p>\n<\/p>\n

1\u3001\u8bfb\u53d6CSV\u6587\u4ef6<\/h4>\n<\/p>\n

\u4f7f\u7528csv.reader<\/code>\u51fd\u6570\u53ef\u4ee5\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u5185\u5bb9\uff0c\u5e76\u5c06\u5176\u8f6c\u6362\u4e3a\u4e00\u4e2a\u53ef\u8fed\u4ee3\u7684\u5bf9\u8c61\u3002<\/p>\n<\/p>\n

import csv<\/p>\n
with open('example.csv', 'r') as file:<\/p>\n
    reader = csv.reader(file)<\/p>\n
    for row in reader:<\/p>\n
        print(row)<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u8bfb\u53d6\u5e26\u6709\u6807\u9898\u7684CSV\u6587\u4ef6<\/h4>\n<\/p>\n
\u5982\u679cCSV\u6587\u4ef6\u5305\u542b\u6807\u9898\u884c\uff0c\u53ef\u4ee5\u4f7f\u7528csv.DictReader<\/code>\u51fd\u6570\u5c06\u6bcf\u884c\u6570\u636e\u8f6c\u6362\u4e3a\u5b57\u5178\uff0c\u952e\u4e3a\u6807\u9898\u884c\u4e2d\u7684\u5b57\u6bb5\u540d\u3002<\/p>\n<\/p>\n
import csv<\/p>\n
with open('example.csv', 'r') as file:<\/p>\n
    reader = csv.DictReader(file)<\/p>\n
    for row in reader:<\/p>\n
        print(row)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528pandas\u5e93<\/h3>\n<\/p>\n
pandas<\/code>\u662fPython\u4e2d\u6700\u6d41\u884c\u7684\u6570\u636e\u5206\u6790\u5e93\u4e4b\u4e00\uff0c\u529f\u80fd\u975e\u5e38\u5f3a\u5927\uff0c\u9002\u7528\u4e8e\u5904\u7406\u5927\u578b\u548c\u590d\u6742\u7684\u6570\u636e\u96c6\u3002\u4f7f\u7528pandas<\/code>\u8bfb\u53d6CSV\u6587\u4ef6\u975e\u5e38\u7b80\u5355\u3002<\/p>\n<\/p>\n
1\u3001\u8bfb\u53d6CSV\u6587\u4ef6<\/h4>\n<\/p>\n
\u4f7f\u7528pandas<\/code>\u7684read_csv<\/code>\u51fd\u6570\u53ef\u4ee5\u8f7b\u677e\u8bfb\u53d6CSV\u6587\u4ef6\uff0c\u5e76\u5c06\u5176\u8f6c\u6362\u4e3aDataFrame\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
import pandas as pd<\/p>\n
df = pd.read_csv('example.csv')<\/p>\n
print(df)<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u8bfb\u53d6\u7279\u5b9a\u5217<\/h4>\n<\/p>\n
\u53ef\u4ee5\u901a\u8fc7usecols<\/code>\u53c2\u6570\u6307\u5b9a\u9700\u8981\u8bfb\u53d6\u7684\u5217\u3002<\/p>\n<\/p>\n
import pandas as pd<\/p>\n
df = pd.read_csv('example.csv', usecols=['Column1', 'Column2'])<\/p>\n
print(df)<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u5904\u7406\u7f3a\u5931\u503c<\/h4>\n<\/p>\n
pandas<\/code>\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u7f3a\u5931\u503c\u5904\u7406\u65b9\u6cd5\uff0c\u5982\u586b\u5145\u3001\u5220\u9664\u7b49\u3002<\/p>\n<\/p>\n
import pandas as pd<\/p>\n
df = pd.read_csv('example.csv')<\/p>\n
df.fillna(0, inplace=True)  # \u75280\u586b\u5145\u7f3a\u5931\u503c<\/p>\n
print(df)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528numpy\u5e93<\/h3>\n<\/p>\n
numpy<\/code>\u5e93\u4e3b\u8981\u7528\u4e8e\u79d1\u5b66\u8ba1\u7b97\uff0c\u4e5f\u63d0\u4f9b\u4e86\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u529f\u80fd\u3002\u9002\u7528\u4e8e\u6570\u503c\u578b\u6570\u636e\u7684\u5904\u7406\u3002<\/p>\n<\/p>\n
1\u3001\u8bfb\u53d6CSV\u6587\u4ef6<\/h4>\n<\/p>\n
\u4f7f\u7528numpy<\/code>\u7684genfromtxt<\/code>\u51fd\u6570\u53ef\u4ee5\u8bfb\u53d6CSV\u6587\u4ef6\u5e76\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002<\/p>\n<\/p>\n
import numpy as np<\/p>\n
data = np.genfromtxt('example.csv', delimiter=',', skip_header=1)<\/p>\n
print(data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u5904\u7406\u7f3a\u5931\u503c<\/h4>\n<\/p>\n
\u53ef\u4ee5\u901a\u8fc7filling_values<\/code>\u53c2\u6570\u6307\u5b9a\u7f3a\u5931\u503c\u7684\u586b\u5145\u503c\u3002<\/p>\n<\/p>\n
import numpy as np<\/p>\n
data = np.genfromtxt('example.csv', delimiter=',', skip_header=1, filling_values=0)<\/p>\n
print(data)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u4f7f\u7528\u5176\u4ed6\u5e93<\/h3>\n<\/p>\n
\u9664\u4e86\u4e0a\u8ff0\u65b9\u6cd5\u5916\uff0c\u8fd8\u6709\u5176\u4ed6\u4e00\u4e9b\u5e93\u4e5f\u53ef\u4ee5\u7528\u4e8e\u8bfb\u53d6CSV\u6587\u4ef6\uff0c\u5982csvkit<\/code>\u3001petl<\/code>\u7b49\u3002\u8fd9\u4e9b\u5e93\u5404\u6709\u7279\u8272\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u4f7f\u7528\u3002<\/p>\n<\/p>\n
\u603b\u7ed3<\/h3>\n<\/p>\n
\u4f7f\u7528\u5185\u7f6e\u7684csv\u6a21\u5757\u9002\u7528\u4e8e\u7b80\u5355\u7684CSV\u6587\u4ef6\u5904\u7406\u4efb\u52a1\uff0c\u4f7f\u7528pandas\u5e93\u9002\u7528\u4e8e\u5904\u7406\u5927\u578b\u548c\u590d\u6742\u7684\u6570\u636e\u96c6\uff0c\u4f7f\u7528numpy\u5e93\u9002\u7528\u4e8e\u6570\u503c\u578b\u6570\u636e\u7684\u5904\u7406<\/strong>\u3002\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5904\u7406\u7684\u6548\u7387\u548c\u51c6\u786e\u6027\u3002<\/p>\n<\/p>\n
\u63a8\u8350\u4f7f\u7528pandas\u5e93\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4ec5\u529f\u80fd\u5f3a\u5927\uff0c\u8fd8\u63d0\u4f9b\u4e86\u7b80\u5355\u6613\u7528\u7684\u63a5\u53e3\uff0c\u4f7f\u5f97\u6570\u636e\u5904\u7406\u66f4\u52a0\u65b9\u4fbf\u5feb\u6377<\/strong>\u3002\u6b64\u5916\uff0cpandas\u8fd8\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6570\u636e\u5206\u6790\u548c\u5904\u7406\u529f\u80fd\uff0c\u53ef\u4ee5\u6ee1\u8db3\u5927\u591a\u6570\u6570\u636e\u5206\u6790\u9700\u6c42\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python3\u4e2d\u8bfb\u53d6CSV\u6587\u4ef6\uff1f<\/strong>
\u5728Python3\u4e2d\uff0c\u8bfb\u53d6CSV\u6587\u4ef6\u901a\u5e38\u4f7f\u7528\u5185\u7f6e\u7684csv<\/code>\u6a21\u5757\u3002\u9996\u5148\uff0c\u60a8\u9700\u8981\u5bfc\u5165\u8be5\u6a21\u5757\uff0c\u7136\u540e\u4f7f\u7528open()<\/code>\u51fd\u6570\u6253\u5f00\u6587\u4ef6\u3002\u63a5\u4e0b\u6765\uff0c\u53ef\u4ee5\u4f7f\u7528csv.reader()<\/code>\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u4ee3\u7801\uff1a  <\/p>\n
import csv\n\nwith open('yourfile.csv', mode='r', newline='') as file:\n    csv_reader = csv.reader(file)\n    for row in csv_reader:\n        print(row)\n<\/code><\/pre>\n
\u8fd9\u4e2a\u4ee3\u7801\u4f1a\u9010\u884c\u8bfb\u53d6CSV\u6587\u4ef6\u5e76\u6253\u5370\u6bcf\u4e00\u884c\u7684\u6570\u636e\u3002<\/p>\n
Python3\u8bfb\u53d6CSV\u6587\u4ef6\u65f6\u5982\u4f55\u5904\u7406\u6807\u9898\u884c\uff1f<\/strong>
\u5728\u5904\u7406\u5e26\u6709\u6807\u9898\u884c\u7684CSV\u6587\u4ef6\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528csv.DictReader()<\/code>\uff0c\u5b83\u5c06\u6bcf\u4e00\u884c\u7684\u6570\u636e\u6620\u5c04\u5230\u4e00\u4e2a\u5b57\u5178\u4e2d\uff0c\u952e\u4e3a\u6807\u9898\u884c\u4e2d\u7684\u503c\u3002\u793a\u4f8b\u5982\u4e0b\uff1a  <\/p>\n
import csv\n\nwith open('yourfile.csv', mode='r', newline='') as file:\n    csv_reader = csv.DictReader(file)\n    for row in csv_reader:\n        print(row['ColumnName'])  # \u66ff\u6362\u4e3a\u5b9e\u9645\u7684\u5217\u540d\n<\/code><\/pre>\n
\u8fd9\u6837\uff0c\u60a8\u5c31\u53ef\u4ee5\u901a\u8fc7\u5217\u540d\u8f7b\u677e\u8bbf\u95ee\u6bcf\u4e00\u884c\u7684\u6570\u636e\u3002<\/p>\n
\u8bfb\u53d6\u5927\u578bCSV\u6587\u4ef6\u65f6\u5982\u4f55\u63d0\u9ad8\u6548\u7387\uff1f<\/strong>
\u5f53\u5904\u7406\u5927\u578bCSV\u6587\u4ef6\u65f6\uff0c\u4f7f\u7528pandas<\/code>\u5e93\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u6548\u7387\u3002pandas<\/code>\u63d0\u4f9b\u4e86\u9ad8\u6548\u7684\u6570\u636e\u7ed3\u6784\u548c\u6570\u636e\u5206\u6790\u5de5\u5177\u3002\u53ef\u4ee5\u4f7f\u7528read_csv()<\/code>\u51fd\u6570\u4e00\u6b21\u6027\u8bfb\u53d6\u6574\u4e2aCSV\u6587\u4ef6\u3002\u793a\u4f8b\u5982\u4e0b\uff1a  <\/p>\n
import pandas as pd\n\ndata = pd.read_csv('yourfile.csv')\nprint(data.head())  # \u6253\u5370\u524d\u4e94\u884c\n<\/code><\/pre>\n
\u4f7f\u7528pandas<\/code>\u65f6\uff0c\u53ef\u4ee5\u8f7b\u677e\u8fdb\u884c\u6570\u636e\u7b5b\u9009\u3001\u6392\u5e8f\u548c\u5904\u7406\uff0c\u8fd9\u5bf9\u4e8e\u5927\u578b\u6570\u636e\u96c6\u975e\u5e38\u6709\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python3\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5982\u4f7f\u7528\u5185\u7f6e\u7684csv\u6a21\u5757\u3001\u4f7f\u7528pandas\u5e93\u3001\u4f7f\u7528numpy\u5e93\u7b49\u3002\u63a8\u8350 […]","protected":false},"author":3,"featured_media":1066070,"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\/1066054"}],"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=1066054"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1066054\/revisions"}],"predecessor-version":[{"id":1066071,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1066054\/revisions\/1066071"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1066070"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1066054"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1066054"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1066054"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}