Python Network Programming 简明教程

Python - WebForm Submission

通常，与网页的交互需要一些数据通过 html 页面中存在的表单提交到服务器。这些 web 表单通常用于诸如注册新帐户或提供姓名或学号等信息以检索考试结果的流程。 requests 模块使用 POST 方法及所需参数优雅地处理此类流程。

Often the interaction with a webpage needs some data to be submitted to the server through the forms present in the html page. These webforms are typically used for processes like signing up for a new account or supplying some information like name or roll number to retrieve the result of an examination. The requests module handles this gracefully using the POST method with the required parameters.

Example

在下面的示例中，我们通过提供用户 ID 和密码值，使用了某个网站的注册表单。在提交值之后，我们打印了响应。

In the below example we use the sign up form of a website by supplying the userid and password value. After the submission of the values we print the response.

import requests

ID_USERNAME = 'signup-user-name'
ID_PASSWORD = 'signup-user-password'
USERNAME = 'username'
PASSWORD = 'yourpassword'
SIGNUP_URL = 'http://codepad.org/login'
def submit_form():
    """Submit a form"""
    payload = {ID_USERNAME : USERNAME, ID_PASSWORD : PASSWORD,}

    resp = requests.get(SIGNUP_URL)
    print "Response to GET request: %s" %resp.content

    resp = requests.post(SIGNUP_URL, payload)
    print "Headers from a POST request response: %s" %resp.headers
#print "HTML Response: %s" %resp.read()

if __name__ == '__main__':
    submit_form()

当我们运行以上程序时，我们得到以下输出：

When we run the above program, we get the following output −

Response to GET request: <!DOCTYPE html>
<html>

<head>

    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <meta HTTP-EQUIV="Pragma" CONTENT="no-cache">
    <meta HTTP-EQUIV="Expires" CONTENT="-1">

    <title>Login - codepad</title>



    <link href="/main.css" media="screen" rel="stylesheet" type="text/css" />
    <style type="text/css">


    </style>
    <script src='https://www.google.com/recaptcha/api.js'></script>
    <script>
       function onRecaptcha(token) {
         document.getElementById("editor-form").submit();
       }
    </script>
</head>


    <body >

	.....................
	.....................