python file read write
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1. 读取文件：
with open('filename.txt', 'r') as file:
content = file.read()
2. 写入文件：
with open('filename.txt', 'w') as file:
file.write('Hello, World!')
3. 追加内容到文件：
with open('filename.txt', 'a') as file:
file.write('Appending text.')
with open('filename.txt', 'r') as file:
content = file.read()
2. 写入文件：
with open('filename.txt', 'w') as file:
file.write('Hello, World!')
3. 追加内容到文件：
with open('filename.txt', 'a') as file:
file.write('Appending text.')
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