How python uses functions as return values

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Use a function as the return value

As mentioned earlier, Python also supports the use of functions as return values for other functions. For example, the following procedures:

Def get_math_func (type): # define a local function to square def square (n): # ① return n * n # define a local function to calculate cubic def cube (n): # ② return n * n * n # define a local function to calculate factorial def factorial (n): # ③ Result = 1 for index in range (2 N + 1): result * = index return result # returns the local function if type = = "square": return square if type = = "cube": return cube else: return factorial# calls get_math_func () The program returns a nested function math_func = get_math_func ("cube") # to get cube function print (math_func (5)) # output 125math_func = get_math_func ("square") # to get square function print (math_func (5)) # output 25math_func = get_math_func ("other") # to get factorial function print (math_func (5)) # output

In the program, a get_math_func () function is defined, which returns another function. Next, three local functions are defined in the bold code of ①, ②, and ③ in the body of the get_math_func () function. Finally, the get_math_func () function uses one of these three local functions as the return value according to the passed parameters.

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