The following code creates a function to make a general intersection utility:
#for every item in the first argument, #if that item is also in the second argument, #append the item to the result. # from ww w . j a va2s. c om def intersect(seq1, seq2): res =  # Start empty for x in seq1: # Scan seq1 if x in seq2: # Common item? res.append(x) # Add to end return res s1 = "TEST" s2 = "SCAM" i= intersect(s1, s2) # Strings print( i )
Here, we've passed in two strings, and we get back a list containing the characters in common.
The function could be replaced with a single list comprehension expression:
l= [x for x in s1 if x in s2] print( l )