python - How do I keep an ID in a pandas DF that has duplicates only if all of its records in another column have the same value? -


i want keep research id if of test grades same, if not cannot rely on integrity of data , must discard id.

i tried creating dictionary, research id below, l4 saved value.

researchid  testgrade    1026379     l4   1026379     l2 1026379     l4 1026379     l4   1026379     l4

you groupby research id , keep ids length of unique test grades equal 1, using filter.

df.groupby('researchid').filter(lambda g: len(g.testgrade.unique()) == 1)

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