open()
f = open('/Users/michael/test.txt', mode='r')
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模式
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可做操作
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若文件不存在
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是否覆盖
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r
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只读
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error
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-
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r+
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读写
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error
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T
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|
w
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只写
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create
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T
|
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w+
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读写
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create
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T
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|
a
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只写
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create
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F,尾部追加写
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a+
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读写
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create
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F,尾部追加写
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|
wb
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只写二进制字符串，写入bytes
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create
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T
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rb
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只读二进制字符串，返回bytes
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error
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-
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1 try:
2 f = open('/path/to/file', 'r')
3 print(f.read())
4 finally:
5 if f:
6 f.close()
with open()
1 with open("test/test.py", "a+") as f:
2 f.write("test")
1 with open("test/test.py", 'r') as f1, open("test/test2.py", 'r') as f2:
2 print(f1.read())
3 print(f2.read())
open() 与 with open() 区别
- open需要主动调用close()，with不需要
- open读取文件时发生异常，没有任何处理，with有很好的处理上下文产生的异常