Question

我正在尝试使用Requests获取页面内容.URL有3个参数：

唯一网页ID
用户名
密码

我的初始代码块如下所示：

import requests

id = raw_input("Enter the unique id:")
user = raw_input("Enter your username:")
password = raw_input("Enter corresponding password:")

try:
    r = requests.get('http://test.com/request.pl?id=' + id, auth=(user, password))
    if r.status_code == 404:
        print "No such page exists.Please check the ID and try again"
        ## Ask for input again
    else:
        print r.text 
except requests.ConnectionError:
    print "Server is refusing connections.Please try after sometime"
    sys.exit(1)

我的问题是在注释行上，我希望再次提示用户输入。如何将控制流传递回脚本的顶部。

我有一种模糊的感觉，我可能会以非常粗暴的方式这样做，并且可能会有更优雅的解决方案使用函数。如果有，请赐教我。

Answer 1

这将做你想要的。

import requests

def user_input():
    id1 = raw_input("Enter the unique id:")
    user = raw_input("Enter your username:")
    password = raw_input("Enter corresponding password:")

    try:
        r = requests.get('http://test.com/request.pl?id='+ id1 + user + password)
        if r.status_code == 404:
            print "No such page exists.Please check the ID and try again"
        ## Ask for input again
            user_input()
        else:
            print r.text
    except requests.ConnectionError:
        print "Server is refusing connections.Please try after sometime"
        sys.exit(1)
user_input()

Answer 2

最简单（但不一定是最具扩展性）的方法是将所有内容放在while True循环中。

import requests

while True:
    id = raw_input("Enter the unique id:")
    user = raw_input("Enter your username:")
    password = raw_input("Enter corresponding password:")

    try:
        r = requests.get('http://test.com/request.pl?id=' + id, auth=(user, password))
        if r.status_code == 404:
            print "No such page exists.Please check the ID and try again"
            ## control flow will reach the bottom and return to the top
        else:
            print r.text
            break
    except requests.ConnectionError:
        print "Server is refusing connections.Please try after sometime"
        sys.exit(1) ## Exit condition of the loop

Answer 3

我会将此代码放在while循环中，该循环始终在True时执行：并且有一个标志，允许您适当地突破循环。

Python-将控制流传递回脚本顶部

3 个答案: