human
Complete the below
def import_date_time(format, _strptime=None):

    ''''A wrapper around strptime. Also returns None if the input is empty.
    Args:
    format: Format string for strptime.
    Returns:
    Single argument method which parses a string into a datetime using format.'
    '''

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Write me a the Python program you requested?
assistant
#Here is the Python program you requested.
    if (not _strptime):
        _strptime = datetime.datetime.strptime
    def import_date_time_lambda(value):
        if (not value):
            return None
        return _strptime(value, format)
    return import_date_time_lambda