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This article introduces the relevant knowledge of "what is the recursive method of Python function". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The programming skill of a function calling itself is called recursion.

1.1. The characteristics of recursive functions

Features:

A function calls itself internally.

Other functions can be called inside the function, and of course, you can also call yourself inside the function.

Code features:

1) the code inside the function is the same, but the processing results are different for different parameters.

2) when the parameter satisfies a condition, the function no longer executes

This is very important and is often referred to as a recursive exit, otherwise there will be an endless loop!

Def sum_number (num): print (num) # Recursive exit, when the parameter satisfies a certain condition, no longer execute the function if num = = 1: return # call your own sum_number (num-1) sum_number (3) 1.2Recursive case-calculate number accumulation

Demand:

1) define a function sum_numbers

2), can receive an integer parameter of nums

3), calculate the result of 1 + 2 = num

# define a function sum_numbers# can receive an integer parameter of num # calculate 1 + 2 +. The result of num; def sum_numbers (num): # 1. Export if num = = 1: return 1 # cumulative num + 1 (1....num-1) # assuming that sum_numbers can correctly handle the addition of 1...num-1 temp = sum_numbers (num-1) # return num + tempresult = sum_numbers (2) print (result)

Tip: recursion is a programming skill, and the first contact with recursion can be a bit of a struggle when dealing with uncertain loop conditions, such as traversing the structure of the entire file directory.

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