python3 pandas: how to fast find the latest number of months that have value is not 0

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There is Dataframe as following:

id  year month y sinx
 1  2019  1    0   1
 1  2019  2    0   2
 1  2019  3    1   3
 1  2019  4    0   4 
 1  2019  5    0


                      
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