python - How to check if an element in the list exists in another list -

how check if element in list exists in list?and if append list.how can make values in list?

common=[]  def findcommon(interactor,interactor1):     in interactor:         if in interactor1:             common.append(a)     return common interactor=['rishi kapoor','kalkidan','aishwarya'] interactor1=['aishwarya','suman ranganathan','rishi kapoor'] 

you can using list comprehensions:

common = [x x in iter_actor1 if x in iter_actor2] 

or using sets:

common = set(iter_actor1).intersection(iter_actor2)