python write to file buffer

https://stackoverflow.com/questions/18984092/python-2-7-write-to-file-instantly
https://stackoverflow.com/questions/3167494/how-often-does-python-flush-to-a-file
Use flush() or

For file operations, Python uses the operating system's default buffering unless you configure it do otherwise. You can specify a buffer size, unbuffered, or line buffered.

For example, the open function takes a buffer size argument.

http://docs.python.org/library/functions.html#open

"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."

bufsize = 0
f = open('file.txt', 'w', bufsize)

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