python csv文件处理

Python中处理CSV文件非常简单。下面是一些常用的CSV文件处理方法：

1. 读取CSV文件

import csv

with open('file.csv', 'r') as file:
    reader = csv.reader(file)
    for row in reader:
        print(row)

2. 写入CSV文件

import csv

with open('file.csv', 'w', newline='') as file:
    writer = csv.writer(file)
    writer.writerow(['Name', 'Age'])
    writer.writerow(['John', '25'])
    writer.writerow(['Mike', '30'])

3. 使用字典读取CSV文件

import csv

with open('file.csv', 'r') as file:
    reader = csv.DictReader(file)
    for row in reader:
        print(row['Name'], row['Age'])

4. 使用字典写入CSV文件

import csv

with open('file.csv', 'w', newline='') as file:
    fieldnames = ['Name', 'Age']
    writer = csv.DictWriter(file, fieldnames=fieldnames)
    writer.writeheader()
    writer.writerow({'Name': 'John', 'Age': '25'})
    writer.writerow({'Name': 'Mike', 'Age': '30'})

这些方法可以帮助你在Python中处理CSV文件。