dq_helper.py 文件源码

def check_nan(val):
    """Check input value for not a number

    :param val: value to be checked for nan
    :returns: true if nan
    :rtype: bool
    """

    if pd.isnull(val):
        return True
    if isinstance(val, str):
        val = val.strip()
        if not val or val.lower() == 'none' or val.lower() == 'nan':
            return True
    #from numpy import datetime64
    # if isinstance(val, datetime64):
    #    return val == datetime64('NaT')
    return False