[Python] Python: convert string to datetime object failed if the format is with comma

So i try to convert my string to date time object without knowing the format this way:

date = '019-03-13 17:35:35.855'
date_object = datetime.fromisoformat(date)


So this works fine but in case the datetime object failed if the format is with comma this fail:

date = '019-03-13 17:35:35,855'
date_object = datetime.fromisoformat(date)

ValueError: Invalid isoformat string: '2019-03-13 17:35:35,855'
​

And most of my files written with this comma format.

Any suggestions ?

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