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分享python 读写文件的默认缓冲区大小
用open方法打开文件时, 如果不指定bufsize, 那默认大小是多少呢
而且是行缓冲还是全缓冲呢, 为什么又的时候我不加f.flush刷新缓存的也能看到及时输出呢?>
而且是行缓冲还是全缓冲呢, 为什么又的时候我不加f.flush刷新缓存的也能看到及时输出呢?>
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libralibra 2012-11-22
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跟系统实现有关
The optional buffering argument specifies the file’s desired buffer size: 0 means unbuffered, 1 means line buffered, any other positive value means use a buffer of (approximately) that size. A negative buffering means to use the system default, which is usually line buffered for tty devices and fully buffered for other files. If omitted, the system default is used. [2]
[2] Specifying a buffer size currently has no effect on systems that don’t have setvbuf(). The interface to specify the buffer size is not done using a method that calls setvbuf(), because that may dump core when called after any I/O has been performed, and there’s no reliable way to determine whether this is the case.
