How to implement a Python CAPTCHA verification program?

2 years ago
Noah Thompson
2 minutes

To implement a captcha verification program, you can follow these steps:

  1. Generate verification code: Use Python’s random number generating function (such as the random module) to create a random string of verification code and display it to the user.
  2. Enter verification code: Prompt the user to enter the verification code and use the input() function to retrieve the user’s input string.
  3. Verify validation code: Compare the user-input code with the generated code to determine if they match. Use an if statement for the comparison and if they match, display a message indicating successful validation; otherwise, display a message indicating failed validation.

Here is a simple example code:

import random

# 生成验证码
def generate_captcha(length):
    captcha = ''
    for _ in range(length):
        captcha += random.choice('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
    return captcha

# 主程序
def main():
    captcha = generate_captcha(4)
    print("验证码：", captcha)
    user_input = input("请输入验证码：")
    
    if user_input.lower() == captcha.lower():
        print("验证码校验成功！")
    else:
        print("验证码校验失败！")

if __name__ == '__main__':
    main()

After running the program, a 4-digit verification code will be generated and users will be prompted to enter the code. Once entered, the program will verify it and provide corresponding feedback. Please note, this is just a simple example, in reality more complex verification code generation and validation logic may be required.

bannerAds