调用Python的os.getcwd（）时如何获得正确的大小写？

Question

When I call os.getcwd() on my Mac under OS X 10.6.4 from my home directory, the path is converted to lowercase. I get

/users/myusername

instead of

/Users/myusername

On another Mac I get the correct uppercase string. How can I configure this? Is there a (hidden) Python setting?

Reason for asking: On OS X all user directories are in "/Users". This is always uppercase. When using Mercurial, it gets sometimes confused with this strange and incorrect normalization of my current directory.

In reply to the suggested solutions:

(1) DiskUtil says that my drive has a format of "Mac OS Extended (Journaled)". I bought my computer some month ago and it's still the original drive, never reformatted.

(2) Another python console session log:

$>>> os.system('pwd')

/Users/klaas

0

$>>> os.getcwd()"

'/users/klaas'

$>>> os.path.normcase('/Users/klaas')

'/Users/klaas'

$>>> os.chdir('/UsErS/klaas')

$>>> os.getcwd()

'/users/klaas'

$>>> os.chdir('/UsErS/klaas')

$>>> os.getcwd()

'/users/klaas'

Thanks for all the replies. I created a test case in Objective-C and it has the same lowercase folder name:

NSFileManager *filemgr;
NSString *currentpath;

filemgr = [NSFileManager defaultManager];

currentpath = [filemgr currentDirectoryPath];

NSLog (@"Current directory is %@", currentpath);

Answer 1

The "HFS plus" filesystem, which has been Apple's filesystem of choice since the days of Mac OS 8, is normally not case-sensitive.

Mac OS X version 10.4, or "Tiger" as it's more commonly known, introduced the ability to create an HFS plus filesystem which is case-sensitive.

Could one of them be using a case-sensitive FS?

Answer 2

The problem seems to be a problem with your particular Python install on your particular Mac. I haven't been able to turn up anyone else who has the same problem.

It's likely that your Mac has a problem with its installation of Python. AFAIK, there isn't a configuration option to make Python represent getcwd() with the proper case (this behavior should be enabled by default). If it's an option, I'd try reinstalling Python. If that doesn't work, you should report a bug to the Python bug tracker .

Answer 3

Two uneducated guesses:

First, apparently OSX is usually case-insensitive, which usually means case-preserving: the name of the current directory either comes from how it's capitalized on disk, or how it was capitalized when you changed into it. If you run os.system('pwd') , does it show it lowercased or not? If so, then that's what the OS is reporting and Python isn't doing anything wrong. Does it change if you os.chdir('/UsErS/username') first?

Second, there's one function that does lowercase or not selectively based on the OS: os.path.normcase . The macpath version does lowercase. I'm pretty sure os.getcwd does not automatically run the results through this; just mentioning it as a place to check.

Answer 4

In the end it was an issue with the Mercurial installation. I ran into it again tonight.

https://www.mercurial-scm.org/wiki/Download gives you different options how to install Mercurial. If I choose the first one (the Mac OS X packages) the "/Users" directory will be reported as "/users" (even when accessing it with Objective C). This can be solved by installing Mercurial via the macports option. This fixes the issue and the "/Users" directory is returned again with an uppercase "U".

Any hints why this is happening are still welcome.

But a least there is a solution.