How do I find missing month in a list of sorted dateformat in pymongo-CodePudding

This is the Data that have to check where the month is missing and I went to find this missing month in the list format

[datetime.datetime(2017, 8, 1, 0, 0),
 datetime.datetime(2017, 9, 1, 0, 0),
 datetime.datetime(2017, 10, 1, 0, 0),
 datetime.datetime(2017, 11, 1, 0, 0),
 datetime.datetime(2017, 12, 1, 0, 0),
 datetime.datetime(2018, 1, 1, 0, 0),
 datetime.datetime(2018, 2, 1, 0, 0),
 datetime.datetime(2018, 3, 1, 0, 0),
 datetime.datetime(2018, 4, 1, 0, 0),
 datetime.datetime(2018, 5, 1, 0, 0),
 datetime.datetime(2018, 6, 1, 0, 0),
 datetime.datetime(2018, 7, 1, 0, 0),
 datetime.datetime(2018, 8, 1, 0, 0),
 datetime.datetime(2018, 9, 1, 0, 0),
 datetime.datetime(2018, 10, 1, 0, 0),
 datetime.datetime(2018, 11, 1, 0, 0),
 datetime.datetime(2018, 12, 1, 0, 0),
 datetime.datetime(2019, 1, 1, 0, 0),
 datetime.datetime(2019, 2, 1, 0, 0),
 datetime.datetime(2019, 3, 1, 0, 0),
 datetime.datetime(2019, 4, 1, 0, 0),
 datetime.datetime(2019, 5, 1, 0, 0),
 datetime.datetime(2019, 6, 1, 0, 0),
 datetime.datetime(2019, 7, 1, 0, 0),
 datetime.datetime(2019, 8, 1, 0, 0),
 datetime.datetime(2019, 9, 1, 0, 0),
 datetime.datetime(2019, 10, 1, 0, 0),
 datetime.datetime(2019, 11, 1, 0, 0),
 datetime.datetime(2019, 12, 1, 0, 0),
 datetime.datetime(2020, 1, 1, 0, 0),
 datetime.datetime(2020, 2, 1, 0, 0),
 datetime.datetime(2020, 3, 1, 0, 0),
 datetime.datetime(2020, 4, 1, 0, 0),
 datetime.datetime(2020, 5, 1, 0, 0),
 datetime.datetime(2020, 6, 1, 0, 0),
 datetime.datetime(2020, 7, 1, 0, 0),
 datetime.datetime(2020, 8, 1, 0, 0),
 datetime.datetime(2020, 9, 1, 0, 0)]

Want to find where year X has not the month Y in this data

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