[Tutor] creating files with python and a thanks
Sun, 17 Feb 2002 17:45:11 -0500
On Saturday, February 16, 2002, at 09:37 AM, Sheila King wrote:
> f = open(r'c:\windows\temp\myfile.mbg', 'w')
> f.write('this is my file\nmy stuff\nis in\nmy\nfile')
> (I used the r in front of the quotes, so that it will interpret the
> string as a "raw" string, and not assume the \t on \temp represents the
> escape sequence for a tab character.)
A quick question on this 'r' flag:
I use a unix-style filesystem, so I wouldn't have the same problem as
above (it would be './temp/myfile.mbg', and I'm making the assumption
that /t has no special meaning, though it might). But is it generally
good practice to use the 'r' flag like this when you have no intention
of using variable/shell expansion?
In PHP, as well as Bash programming, single quotes are used for when you
wish this effect -- a 'literal' string. But double-quotes are used when
you are okay with \t matching [tab] and other meta-characters. Judging
from this example, the Python equivalent is using 'open(r'string', 'w')'.
Do you try to always use the 'r' option -except- when you want
expansion, or is the general practice to only use it when you -need- it
to prevent a metacharacter like \t from being expanded?