To read some text file, in C or Pascal, I always use the following snippets to read the data until EOF:

while not eof do begin

readline(a);

do_something;

end;

Thus, I wonder how can I do this simple and fast in Python?

解決方案

Loop over the file to read lines:

with open('somefile') as openfileobject:

for line in openfileobject:

do_something()

File objects are iterable and yield lines until EOF. Using the file object as an iterable uses a buffer to ensure performant reads.

You can do the same with the stdin (no need to use raw_input():

import sys

for line in sys.stdin:

do_something()

To complete the picture, binary reads can be done with:

from functools import partial

with open('somefile', 'rb') as openfileobject:

for chunk in iter(partial(openfileobject.read, 1024), ''):

do_something()

where chunk will contain up to 1024 bytes at a time from the file.

總結

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