python - Checking if an input is in sql alchemy data-type format -

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so i'm parsing information excel sheet , running data-type issues.

there different fields, dates , strings, etc. problem people idiots , inputting things incorrectly. date field might 'na' or that. trying condition if it's not correct format, replace none.

so in psuedo-code

if not( expiration_date date.format):        expiration_date = none

however can't find online can me. there efficient way of doing this?

in case wanted code, here go:

import datetime  expiration_date=datetime.datetime.now()  if  type(expiration_date) != datetime.datetime:     expiration_date = none

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