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Key Points:
<span>request</span>usually refers to operations related to sending HTTP requests in programming. In Python, the<span>requests</span>library is a commonly used third-party library for sending HTTP requests. It conveniently simulates a browser to send various types of requests (such as GET, POST, etc.) to a server and retrieves the server’s response. -
Function：In practical applications, the
<span>requests</span>library has a wide range of uses. For example, in web scraping, it is used to send requests to obtain the HTML content of web pages and extract the required data; when interacting with APIs, it sends requests to the API server to retrieve data or perform specific operations; during web service testing, it simulates different requests to verify the correctness and stability of the service, etc. -
Code Example 1: Sending a GET Request
import requests
# Send a GET request to the specified URL
response = requests.get('https://www.example.com')
# Print the response status code
print('Status Code:', response.status_code)
# Print the response text content
print('Response Content:', response.text)
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Explanation：First, import the
<span>requests</span>library, then use the<span>requests.get()</span>method to send a GET request to<span>https://www.example.com</span>, storing the returned response object in the<span>response</span>variable. Next, print the response status code (to determine if the request was successful) and the response text content (i.e., the HTML code of the webpage). -
Code Execution Analysis：During program execution, the
<span>requests.get()</span>method establishes a connection with the server, sends the GET request, and the server processes the request and returns a response. The program stores the response in the<span>response</span>variable and finally prints the status code and text content. -
Result：A status code of 200 typically indicates that the request was successful, and the response content will display the HTML code of the
<span>https://www.example.com</span>webpage. -
Code Example 2: Sending a GET Request with Parameters
import requests
# Define request parameters
params = {'key1': 'value1', 'key2': 'value2'}
# Send a GET request with parameters
response = requests.get('https://www.example.com', params=params)
# Print the response URL, including request parameters
print('Requested URL:', response.url)
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Explanation：First, define a dictionary
<span>params</span>to store the request parameters, then pass these parameters in the<span>requests.get()</span>method using the<span>params</span>argument, which appends the parameters to the URL. Finally, print the actual requested URL. -
Code Execution Analysis：During program execution, the
<span>requests</span>library encodes the parameters in the<span>params</span>dictionary and appends them to the specified URL before sending the GET request. The server processes the request based on this parameterized URL and returns a response, and the program prints the actual requested URL. -
Result：The printed URL will include a parameter section like
<span>key1=value1&key2=value2</span>. -
Code Example 3: Sending a POST Request
import requests
# Define the data for the POST request
data = {'username': 'testuser', 'password': 'testpass'}
# Send a POST request
response = requests.post('https://www.example.com/login', data=data)
# Print the response status code
print('Status Code:', response.status_code)
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Explanation：Define a dictionary
<span>data</span>to store the data to be sent in the POST request, using the<span>requests.post()</span>method to send a POST request to<span>https://www.example.com/login</span>, passing the data through the<span>data</span>argument. Finally, print the response status code. -
Code Execution Analysis：During program execution, the
<span>requests.post()</span>method encapsulates the data in the request body and sends it to the server. The server processes the data upon receiving the request and returns a response, and the program prints the status code. -
Result：A status code of 200 indicates that the request was successful, and different servers may return different results based on the POST data.
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Code Example 4: Sending a Request and Handling JSON Response
import requests
# Send a GET request to a JSON API
response = requests.get('https://api.example.com/data')
# Parse the response content as JSON
json_data = response.json()
# Print the parsed JSON data
print('JSON Data:', json_data)
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Explanation：Use the
<span>requests.get()</span>method to send a GET request to<span>https://api.example.com/data</span>to obtain the server’s response. Then, use the<span>response.json()</span>method to parse the response content into a Python dictionary or list (if the response is in valid JSON format), and finally print the parsed JSON data. -
Code Execution Analysis：After sending the request, the server returns a response in JSON format. The
<span>response.json()</span>method attempts to parse the response content into a Python object, storing it in the<span>json_data</span>variable if successful, and finally prints that variable. -
Result：The parsed JSON data will be printed in the form of a Python dictionary or list.
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Summary of Key Points (in ordered list)：
<span>requests</span>library is used to send HTTP requests, supporting various request types such as GET and POST.- GET requests can be sent using the
<span>requests.get()</span>method, with request parameters passed through the<span>params</span>argument. - POST requests can be sent using the
<span>requests.post()</span>method, with request data passed through the<span>data</span>argument. - The response status code can be obtained using
<span>response.status_code</span>to determine if the request was successful. - For JSON format responses, the
<span>response.json()</span>method can be used to parse it into a Python object.
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