Compare versions in Python

version_cmp.py

def cmp_version(va, vb):
    # Split over '.' and convert members into int
    va = map(int, va.split("."))
    vb = map(int, vb.split("."))

    # Get max length of versions
    l = max(len(va), len(vb))

    # Make the version the same length by appending 0
    va = va + [0] * (l - len(va))
    vb = vb + [0] * (l - len(vb))

    assert len(va) == len(vb)

    # Use Python tuple comparaison operator
    if va < vb:
        return -1

    elif va > vb:
        return 1

    return 0

assert cmp_version('1', '2') == -1
assert cmp_version('2', '1') == 1
assert cmp_version('1', '1') == 0
assert cmp_version('1.0', '1') == 0
assert cmp_version('1', '1.000') == 0
assert cmp_version('12.01', '12.1') == 0
assert cmp_version('13.0.1', '13.00.02') == -1
assert cmp_version('1.1.1.1', '1.1.1.1') == 0
assert cmp_version('1.1.1.2', '1.1.1.1') == 1
assert cmp_version('1.1.3', '1.1.3.000') == 0
assert cmp_version('3.1.1.0', '3.1.2.10') == -1
assert cmp_version('1.1', '1.10') == -1