timezone.py 文件源码

def is_naive(value):
    """
    Determines if a given datetime.datetime is naive.

    The concept is defined in Python's docs:
    http://docs.python.org/library/datetime.html#datetime.tzinfo

    Assuming value.tzinfo is either None or a proper datetime.tzinfo,
    value.utcoffset() implements the appropriate logic.
    """
    return value.utcoffset() is None