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df.concat(train,test)
published 15 Sep 2020, 09:24

please after performing this concatenation i encountered Null values in my target column. how do I handle this?

Bear with me, but I don't think you are meant to concatenate the datasets.

You can work with the train and test dataset separately but I want to perform Feature Eng on the dataset together, reasons why I concatenated.

Try using df = pd.concat([train, test]).reset_index(drop = True)

Yeah use this:

train['source']='train'

test['source']='test'

data = pd.concat([train, test],ignore_index=True) print (train.shape, test.shape, data.shape)