build.py 文件源码

def sorted_with_cmp(sequence, cmp_func, **kwargs):
    # sort with a cmp func which works under both Python 2 and 3

    if sys.version_info[0] == 3:
        from functools import cmp_to_key

        key = cmp_to_key(cmp_func)

        def do_sort(x):
            return sorted(x, key=key, **kwargs)
    else:
        def do_sort(x):
            return sorted(x, cmp=cmp_func, **kwargs)

    return do_sort(sequence)