print statement inside of input returns with a “none”

by

input takes a prompt string as its argument, which it will print automatically, but print returns None; it is this that gets printed by input. Your code is equivalent to:

prompt = print(...) # prompt == None
ans = int(input(prompt))

Instead, use str.format to build the prompt and pass it straight to input:

ans = int(input('{0}x{1}='.format(multi, num)))

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