Another gotcha is that datetime.datetime.fromisoformat is picky about fractional seconds:
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2020-01-01T12:33:56
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2020-01-01T12:33:56.0
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2020-01-01T12:33:56.000 (milliseconds) -
2020-01-01T12:33:56.0000
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2020-01-01T12:33:56.000000 (microseconds) -
2020-01-01T12:33:56.00000 # commonly generated by JavaScript libraries -
2020-01-01T12:33:56.0000000
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2020-01-01T12:33:56.000000000 (nanoseconds) # golang, tc39 Temporal