dataframeA, dataframeB
Id, name
if I want to make dataframeA's name None if Id exist in dataframeB
dataframA
ID, name
1 jake
2 kim
dataframe B
ID, name
1, None
result
ID, name
1 None
2 kim
sub.apply(lambda x: None if x.ImageId in noimages_list else x.EncodedPixels)