perl 和 python中的回调函数

就是向函数的参数为   一个函数的引用sub  callback1 {    ......}sub  callback2 {   ......}sub run {   my $func_ref = shift;  .....  ....}if (a>b) {     run(\&callback1);}else {    run(\&callback2);}def my_callback(input):    print "function my_callback was called with %s input" % (input,)def caller(input, func):    func(input)for i in range(5):    caller(i, my_callback)C:\Python27\python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/cookbook/a3.pyfunction my_callback was called with 0 inputfunction my_callback was called with 1 inputfunction my_callback was called with 2 inputfunction my_callback was called with 3 inputfunction my_callback was called with 4 inputdef apply_async(func, args,  callback):# Compute the result  result = func(*args)# Invoke the callback with the result  callback(result)def print_result(result):    print('Got:', result)def add(x, y):    return x + y*2print  apply_async(add, (2, 3), print_result)C:\Python27\python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/cookbook/a4.py('Got:', 8)None