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def intersect(*args):
res = []
for x in args[0]: # scan first sequence
for other in args[1:]: # for all other args
if x not in other: break # item in each one?
else: # no: break out of loop
res.append(x) # yes: add items to end
return res
def union(*args):
res = []
for seq in args: # for all args
for x in seq: # for all nodes
if not x in res:
res.append(x) # add new items to result
return res
s1, s2, s3 = "SPAM", "SCAM", "SLAM"
intersect(s1, s2), union(s1, s2) # 2 operands
intersect([1,2,3], (1,4)) # mixed types
intersect(s1, s2, s3) # 3 operands
union(s1, s2, s3)
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