Generating Image Captcha in Python Using graphic-verification-code and captcha Libraries

The article presents two practical methods for generating image captcha (verification code) images in Python.

Method 1: graphic-verification-code library Install the library with pip install graphic-verification-code. Then import and generate a captcha image and its corresponding text:

import gvcode
a, m = gvcode.generate()  # unpack the tuple
a.show()                     # display the generated image
print(m)                     # print the captcha text

The resulting image and the printed code are shown as the execution result.

Method 2: captcha library Install the library with pip install captcha. Use ImageCaptcha to create an image from a given string:

from captcha.image import ImageCaptcha
img = ImageCaptcha().generate_image("176AK0")
img.show()

This also displays the generated image.

Advanced usage: random 4‑character captcha By importing randint and defining a list of alphanumeric characters, you can generate a random 4‑character string and create its image:

from captcha.image import ImageCaptcha
from random import randint
list = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z']

data = ''
for i in range(4):
    data += list[randint(0,62)]
img = ImageCaptcha().generate_image(data)
img.show()

Sample output images for each method are included in the original article.