weird behavior of relpath

gistfile1.py

Python:
    os.chdir(path)
    cwd = os.getcwd()
    print path
    print cwd
    print os.path.relpath(path, start=cwd)

output:

./themes/bold
/Users/aelaguiz/workspace/cratejoy/themes/bold
themes/bold

From command line:

(venv)amir-laptop:cratejoy aelaguiz$ python
Python 2.7.5 (default, Aug 25 2013, 00:04:04)
[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import os.path
>>> os.path.relpath("./themes/bold", "/Users/aelaguiz/workspace/cratejoy/themes/bold")
'.'

I think the fact it says it doesn't use the FS is kind of a lie, it's at least aware of cwd, so I think your os.chdir is confusing things.

$ python
Python 2.7.6 (default, Nov 29 2013, 07:30:55)
[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.2.79)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.path.relpath('./share/vim', '/Users/alex/share/vim')
'.'
>>> os.path.relpath('./share/vim', '/Users/alex/does/not/exist/share/vim')
'../../../../../share/vim'