Mercurial > cpython-lru_cache-weakref
diff Doc/tutorial/inputoutput.rst @ 83397:6a4746b0afaf 2.7
#13510: clarify that f.readlines() is note necessary to iterate over a file. Patch by Dan Riti.
| author | Ezio Melotti <ezio.melotti@gmail.com> |
|---|---|
| date | Mon, 15 Apr 2013 19:08:31 +0300 |
| parents | 488957f9b664 |
| children | ef037ad304c1 |
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--- a/Doc/tutorial/inputoutput.rst Mon Apr 15 09:51:54 2013 -0400 +++ b/Doc/tutorial/inputoutput.rst Mon Apr 15 19:08:31 2013 +0300 @@ -295,18 +295,8 @@ >>> f.readline() '' -``f.readlines()`` returns a list containing all the lines of data in the file. -If given an optional parameter *sizehint*, it reads that many bytes from the -file and enough more to complete a line, and returns the lines from that. This -is often used to allow efficient reading of a large file by lines, but without -having to load the entire file in memory. Only complete lines will be returned. -:: - - >>> f.readlines() - ['This is the first line of the file.\n', 'Second line of the file\n'] - -An alternative approach to reading lines is to loop over the file object. This is -memory efficient, fast, and leads to simpler code:: +For reading lines from a file, you can loop over the file object. This is memory +efficient, fast, and leads to simple code:: >>> for line in f: print line, @@ -314,9 +304,8 @@ This is the first line of the file. Second line of the file -The alternative approach is simpler but does not provide as fine-grained -control. Since the two approaches manage line buffering differently, they -should not be mixed. +If you want to read all the lines of a file in a list you can also use +``list(f)`` or ``f.readlines()``. ``f.write(string)`` writes the contents of *string* to the file, returning ``None``. ::
