Identify column values that are in train but missing in test

@mohdsanadzakirizvi wrote:

I have data of the following structure

Screen Shot 2017-07-11 at 13.35.42.png909x237 23.6 KB

I want to check how many values of the column "Item_Identifier" are missing in the test data.

I have already got a list of unique "Item_Identifier" from the test by

item_ids_in_test = test.Item_Identifier.unique()

Surely I can run loops and check but the dataset is large , it will take time and I am looking for a better way , if pandas provide it?

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