Generate Captcha Code Using Python

A comprehensive guide on how to generate Captcha code using Python with the `captcha` library. This guide will help you understand how to create a simple Captcha to protect your forms from spam and bots.

This article introduces how to use the captcha library in Python to generate a Captcha image easily, helping you protect your website from automated bot access.

Python Code

from captcha.image import ImageCaptcha
import random
import string

# Create an ImageCaptcha object
image_captcha = ImageCaptcha(width=280, height=90)

# Generate a random string of 5 characters
captcha_text = ''.join(random.choices(string.ascii_uppercase + string.digits, k=5))

# Generate the Captcha image from the random string
image = image_captcha.generate_image(captcha_text)

# Save the Captcha image
image.save("captcha_example.png")
print(f"Generated Captcha: {captcha_text}")

Detailed explanation:

1. from captcha.image import ImageCaptcha: Imports the ImageCaptcha class from the captcha library to generate the Captcha image.
2. import random and import string: Used to generate a random character string for the Captcha code.
3. image_captcha = ImageCaptcha(width=280, height=90): Initializes an ImageCaptcha object with specific image dimensions.
4. captcha_text = ''.join(random.choices(string.ascii_uppercase + string.digits, k=5)): Generates a random string of 5 characters including uppercase letters and digits.
5. image = image_captcha.generate_image(captcha_text): Creates the Captcha image from the generated string.
6. image.save("captcha_example.png"): Saves the Captcha image as a PNG file.

System Requirements:

• Python 3.6 or newer
• captcha library (latest version)

How to install the libraries needed to run the Python code above:

Install the captcha library using the following command:

pip install captcha

Tips:

• You can customize the size or font of the Captcha to increase complexity.
• Avoid displaying Captcha where it is unnecessary to prevent user inconvenience.

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