Python exercise 022: Use recursive functions to reverse the string, python022

Python exercise 022: Use recursive functions to reverse the string, python022

[Python exercise 022]The input five characters are printed in reverse order using the recursive function call method.

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Another recursive question! However, with the experience of [Python exercise question 021: Recursive Method for factorial], it is not difficult to draw a factorial Based on Huludao. The Code is as follows:

Str = input ('enter several characters: ') def f (x): if x =-1: return ''else: return str [x] + f (x-1) print (f (len (str)-1 ))

The output result is as follows:

Enter several characters: abcdefg
Gfedcba

What if recursive functions are not required? It's much simpler: first convert the input string into a list, sort it in reverse order, and then join () together to bring it to the table. The Code is as follows:

Str = list (input ('enter several characters: ') str. reverse () print (''. join (str ))

It may be that my current level is too low to understand the power of recursive functions. A long journey ......

 

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Source: getting started with programming languages: 100 typical examples [Python]