380162267qq at gmail.com writes: > A=["1","2","3"] > print(list(map(float,A)).insert(0,1)) > > I want to insert 1 at the head of the list but this gives me a surprise Is it the same surprise that you get from print([1,2,3].insert(0,1))? Or the more advanced surprise from print(A.insert(0,1))?