environment/lib/python2.7/site-packages/IPython/core/prompts.py
def cwd_filt2(depth):
    """Return the last depth elements of the current working directory.

    $HOME is always replaced with '~'.
    If depth==0, the full path is returned."""

    full_cwd = os.getcwdu()
    cwd = full_cwd.replace(HOME,"~").split(os.sep)
    if '~' in cwd and len(cwd) == depth+1:
        depth += 1
    drivepart = ''
    if sys.platform == 'win32' and len(cwd) > depth:
        drivepart = os.path.splitdrive(full_cwd)[0]
    out = drivepart + '/'.join(cwd[-depth:])

    return out or os.sep
def cwd_filt2(depth):
    """Return the last depth elements of the current working directory.

    $HOME is always replaced with '~'.
    If depth==0, the full path is returned."""

    full_cwd = os.getcwdu()
    cwd = full_cwd.replace(HOME,"~").split(os.sep)
    if '~' in cwd and len(cwd) == depth+1:
        depth += 1
    drivepart = ''
    if sys.platform == 'win32' and len(cwd) > depth:
        drivepart = os.path.splitdrive(full_cwd)[0]
    out = drivepart + '/'.join(cwd[-depth:])

    return out or os.sep
Return the last depth elements of the current working directory.

    $HOME is always replaced with '~'.
    If depth==0, the full path is returned.