Think python（第二版）习题代码

3-2：python def do_twice(f, s1): f(s1) f(s1) def print_spam(s2): print(s2) def print_twice(s3): print(s3) print(s3) def do_four(f1,f2,s4): f1(f2,s4) f1(f2,s4) do_twice(print_twice, 'aaa') d

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