Afternoon all,
MacOS X seems to have some heretical ideas about the value of case in
paths - it seems to believe that it doesn't exist, more or less, so "touch
foo FOO" touches just one file, you can't have both 'makefile' and
'Makefile' in the same directory,
"os.path.exists(some_valid_path.upper())" returns True even when
"os.path.split(some_valid_path.upper())[1] in
os.listdir(os.path.split(some_valid_path)[0])" returns False, etc
(although, of course, "ls *.txt" doesn't mention any of those .TXT files
lying around).
Just to prove it, here's what unix (specifically, linux) does:
[EMAIL PROTECTED]:~$ uname
Linux
[EMAIL PROTECTED]:~$ python
Python 2.3.5 (#2, Sep 4 2005, 22:01:42)
[GCC 3.3.5 (Debian 1:3.3.5-13)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> filenames = os.listdir(".")
>>> first = filenames[0]
>>> first in filenames
True
>>> first.upper() in filenames
False
>>> os.path.exists(os.path.join(".", first))
True
>>> os.path.exists(os.path.join(".", first.upper()))
False
>>>
And here's what OS X does:
Hooke:~ tom$ uname
Darwin
Hooke:~ tom$ python
Python 2.4.1 (#2, Mar 31 2005, 00:05:10)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1666)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> filenames = os.listdir(".")
>>> first = filenames[0]
>>> first in filenames
True
>>> first.upper() in filenames
False
>>> os.path.exists(os.path.join(".", first))
True
>>> os.path.exists(os.path.join(".", first.upper()))
True
>>>
Sigh. Anyone got any bright ideas for working around this, specifically
for os.path.exists? I was hoping there was some os.path.actualpath, so i
could say:
def exists_dontignorecase(path):
return os.path.exists(path) and (path == os.path.actualpath(path))
Java has a java.io.File.getCanonicalPath method that does this, but i
can't find an equivalent in python - is there one?
I can emulate it like this:
def _canonicalise(s, l):
s = s.lower()
for t in l:
if s == t.lower():
return t
raise ValueError, ("could not canonicalise string", s)
def canonicalpath(path):
if (path in ("/", "")):
return path
parent, child = os.path.split(path)
cparent = canonicalpath(parent)
cchild = _canonicalise(child, os.listdir(cparent))
return os.path.join(cparent, cchild)
Or, more crudely, do something like this:
def exists_dontignorecase(path):
dir, f = os.path.split(path)
return f in os.listdir(dir)
But better solutions are welcome.
Thanks,
tom
--
Infantry err, infantry die. Artillery err, infantry die. -- IDF proverb
--
http://mail.python.org/mailman/listinfo/python-list
