# We have dataframe A with column name
# We have dataframe B with column name
# I want to see rows in A with name Y such that there exists rows in B with name Y.
# It's like set intersection.
intersected = reduce(lambda x, y: x | (A['name'] == y), [False] + list(B['name']))
intersection = A[intersected]

# other alternatives
intersection = pd.merge(A, B, how='inner', on=['name'])
intersection.dropna(inplace=True)