def normpath(path):
    if path == '':
        return '.'
    initial_slashes = path.startswith('/')
    # POSIX allows one or two initial slashes, but treats three or more
    # as single slash.
    if (initial_slashes and
        path.startswith('//') and not path.startswith('///')):
        initial_slashes = 2
    comps = path.split('/')
    new_comps = []
    for comp in comps:
        if comp in ('', '.'):
            continue
        if (comp != '..' or (not initial_slashes and not new_comps) or
             (new_comps and new_comps[-1] == '..')):
            new_comps.append(comp)
        elif new_comps:
            new_comps.pop()
    comps = new_comps
    path = '/'.join(comps)
    if initial_slashes:
        path = '/'*initial_slashes + path
    return path or '.'
Tests that the null graph has empty node boundaries.
dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/posixpath.py/normpath--crossover with--dataset/ETHPy150Open networkx/networkx/networkx/algorithms/tests/test_boundary.py/TestNodeBoundary.test_null_graph