eat python 003

Documentation for C's fopen():
---
r Open text file for reading. The stream is positioned at the beginning
of the file.
r+ Open for reading and writing. The stream is positioned at the
beginning of the file.
w Truncate file to zero length or create text file for writing. The
stream is positioned at the beginning of the file.
w+ Open for reading and writing. The file is created if it does not
exist, otherwise it is truncated. The stream is positioned at the
beginning of the file.
a Open for writing. The file is created if it does not exist. The stream
is positioned at the end of the file.
a+ Open for reading and writing. The file is created if it does not
exist. The stream is positioned at the end of the file.
======================================================
In Python: http://docs.python.org/library/functions.html#open
Modes 'r+'
, 'w+'
and 'a+'
open the file for updating (note that
'w+'
truncates the file). Append 'b'
to the mode to open the file in
binary mode, on systems that differentiate between binary and text files; on
systems that don’t have this distinction, adding the 'b'
has no effect.
In addition to the standard fopen()
values mode
may be 'U'
or
'rU'
. Python is usually built with universal newline support; supplying
'U'
opens the file as a text file, but lines may be terminated by any of the
following: the Unix end-of-line convention '\n'
, the Macintosh convention
'\r'
, or the Windows convention '\r\n'
. All of these external
representations are seen as '\n'
by the Python program. If Python is built
without universal newline support a mode
with 'U'
is the same as normal
text mode. Note that file objects so opened also have an attribute called
newlines
which has a value of None
(if no newlines have yet been
seen), '\n'
, '\r'
, '\r\n'
, or a tuple containing all the newline
types seen.
Python enforces that the mode, after stripping 'U'
, begins with 'r'
,
'w'