'00 'is not a valid 12-hour hour, but if your input date string is inconsistently formatted, you can leave with something like this:
>>> from datetime import datetime as dt
>>> date_as_string = '1/12/07 00:07 AM'
>>> format_12 = '%d/%m/%y %I:%M %p'
>>> format_24 = '%d/%m/%y %H:%M %p'
>>> date_string, time_string = date_as_string.split(' ', 1)
>>> try:
... dt.strptime(date_string + ' ' + time_string, format_12)
... except ValueError:
... dt.strptime(date_string + ' ' + time_string, format_24)
...
datetime.datetime(2007, 12, 1, 0, 7)
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