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Author eric.smith
Recipients eric.smith, paul.moore, steve.dower, swarnila707, tim.golden, zach.ware
Date 2021-05-09.07:17:15
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1620544635.71.0.842018710581.issue44083@roundup.psfhosted.org>
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This is almost certainly not a bug in python. You're probably entering an empty string for "a".

Try it without using input(). For example, replace lines 2 and 3 with:
a = "3"
b = "4"
History
Date User Action Args
2021-05-09 07:17:15eric.smithsetrecipients: + eric.smith, paul.moore, tim.golden, zach.ware, steve.dower, swarnila707
2021-05-09 07:17:15eric.smithsetmessageid: <1620544635.71.0.842018710581.issue44083@roundup.psfhosted.org>
2021-05-09 07:17:15eric.smithlinkissue44083 messages
2021-05-09 07:17:15eric.smithcreate