python之为什么请求返回 "None"

import requests 
 
def get(url): 
    if url[:7] == 'http://': 
        if url[7:11] == 'www.': 
            print url 
            response = requests.get(url) 
            if response.status_code == 200: 
                return 'ok' 
 
            else: 
                return 'error' 
        else: 
            print(url) 
            url = 'http://www.' + url[7:] 
            get(url) 
    else: 
        print(url) 
        url = 'http://' + url 
        get(url) 
 
print get('example.com') 

谁能告诉我为什么这段代码返回“无”

请您参考如下方法:

您不会从对 get() 函数的递归调用中返回结果。

您需要返回递归调用 get() 函数的结果，示例 -

import requests 
 
def get(url): 
    if url[:7] == 'http://': 
        if url[7:11] == 'www.': 
            print url 
            response = requests.get(url) 
            if response.status_code == 200: 
                return 'ok' 
 
            else: 
                return 'error' 
        else: 
            print(url) 
            url = 'http://www.' + url[7:] 
            return get(url) 
    else: 
        print(url) 
        url = 'http://' + url 
        return get(url) 
 
print get('example.com')