Python allows you to easily create image verification codes,

Python allows you to easily create image verification codes,

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The verification codes demonstrated here are simple. You can also distort the characters.

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The Python third-party library is extremely powerful. PIL is a python d third-party image processing module. We can also use it to generate image verification codes.
PIL Installation
Command installation:

pip install pillow

Download the source code for installation:
Copy address: https://github.com/python-pillow/Pillow

PIL usage

Example: generate an image and fill it with text

#! /Usr/bin/python #-*-coding: UTF-8-*-from PIL import Image, ImageDraw, ImageFont, ImageFilter # instance: an Image object 240x60: width = 60*4 height = 60 # image color clo = (43, 34, 88) # I think it is purple-blue Image = image. new ('rgb ', (width, height), clo) # create a Font object: # font files can be downloaded using the operating system or from the Internet. truetype ('. /font/Arial. ttf', 36) # create a Draw object: draw = ImageDraw. draw (image) # output text: str1 = "ren Python" w = 4 # distance from the left of the image to h = 10 # distance from the top of the image to draw. text (w, h), str1, font = font) # blur: image. filter (ImageFilter. BLUR) code_name = 'test_code_img.jpg 'Save _ dir = '. /{}'. format (code_name) image. save (save_dir, 'jpeg ') print ("saved image :{}". format (save_dir ))

(Venv) allenwoo @~ /Renren/code $ python test2.py saved image:./test_code_img.jpg

The image is as follows:

Paste_Image.png

There is no color in the text. We can also add a color, just pass the fill parameter in the text.
Draw. text (w, h), str1, font = font, fill = (78, 64, 65 ))
Random color

Paste_Image.png

We can also make the background into many smaller points, and fill in other colors at intervals of n pixels, for example:

#! /Usr/bin/python #-*-coding: UTF-8-*-from PIL import Image, ImageDraw, ImageFont, ImageFilter # instance: an Image object 240x60: width = 60*4 height = 60 # image color clo = (43, 34, 88) # I think it is purple-blue Image = image. new ('rgb ', (width, height), clo) # create a Font object: # font files can be downloaded using the operating system or from the Internet. truetype ('. /font/Arial. ttf', 36) # create a Draw object: draw = ImageDraw. draw (image) # Fill pixel: # width every 20, height every 5, form coordinates x, y # Red:, 60for x in range (0, width, 20 ): for y in range (0, height, 5): draw. point (x, y), fill = (220, 20, 60) # output text: str1 = "we are renren" w = 4 # distance from the left of the image to h = 10 # distance from the top of the image to draw. text (w, h), str1, font = font, fill = (78, 64, 65) # blur: image. filter (ImageFilter. BLUR) code_name = 'test_code_img.jpg 'Save _ dir = '. /{}'. format (code_name) image. save (save_dir, 'jpeg ') print ("saved image :{}". format (save_dir ))

Result image:

Paste_Image.pngPIL

Using the above, and the random generator random we have learned before, we can create a verification code,
Generate Verification Code

#! /Usr/bin/python #-*-coding: UTF-8-*-from uuid import uuid1from PIL import Image, ImageDraw, ImageFont, ImageFilterimport randomdef rnd_char (): '''random letter or number: return: ''' # random letter or number I = random. randint (1, 3) if I = 1: # random digit ASCII Code an = random. randint (97,122) elif I = 2: # random lowercase letter ASCII Code an = random. randint (65, 90) else: # random uppercase letter ASCII Code an = random. randint (48, 57) # convert Ascii code into characters and return Return chr (an) # interference def rnd_dis (): ''' random disturbance word: return: ''' d = ['^ ','-','~ ','_','. '] I = random. randint (0, len (d)-1) return d [I] # two random colors specify different regions to prevent interference characters from being the same color as the verification code characters # random color 1: def rnd_color (): ''' random color, specified range: return: ''' return (random. randint (64,255), random. randint (64,255), random. randint (64,255) # random color 2: def rnd_color2 (): ''' random color, specified range: return: ''' return (random. randint (32,127), random. randint (32,127), random. randint (32,127) def create_code (): #240x60: width = 60*4 height = 60 image = Image. new ('rgb ', (width, height), (192,192,192) # create a Font object: font = ImageFont. truetype ('. /font/Arial. ttf', 36) # create a Draw object: draw = ImageDraw. draw (image) # Fill in each pixel: for x in range (0, width, 20): for y in range (0, height, 10): draw. point (x, y), fill = rnd_color () # fill in the character _ str = "" # fill in four random numbers or letters as the verification code for t in range (4): c = rnd_char () _ str = "{}{}". format (_ str, c) # random distance from the top of the image, but at least 30 pixels h = random. randint (1, height-30) # width. Each character occupies 1/4 of the image width, and a 10 pixel gap w = width/4 * t + 10 draw is added. text (w, h), c, font = font, fill = rnd_color2 () # in the actual project, the verification code is saved in the database, add the time field print ("Save the verification code {} to the Database ". format (_ str) # Add a character disturbance to the image. The density is controlled by w and h for j in range (0, width, 30): dis = rnd_dis () w = t * 15 + j # random distance from the top of the image, but at least 30 pixels h = random. randint (1, height-30) draw. text (w, h), dis, font = font, fill = rndColor () # Fuzzy: image. filter (ImageFilter. BLUR) # uuid1 generates a unique string as the verification code image name code_name = '00000000.jpg '. format (uuid1 () save_dir = '. /{}'. format (code_name) image. save (save_dir, 'jpeg ') print ("saved image :{}". format (save_dir) # When directly running the file is sum, run the following code: if _ name _ = "_ main _": create_code ()

(Venv) allenwoo @~ /Renren/code $ python test. py Save the verification code ef3k to the database saved picture:./c86e03c0-1c23-11e7-999d-f45c89c09e61.jpg (venv) allenwoo @~ /Renren/code $ python test. py Save the verification code I37X to the database saved picture:./cb8aed02-1c23-11e7-9b18-f45c89c09e61.jpg (venv) allenwoo @~ /Renren/code $ python test. py Save the verification code vVL1 to the database saved picture:./cc120da8-1c23-11e7-b762-f45c89c09e61.jpg (venv) allenwoo @~ /Renren/code $ python test. py Save the verification code K6w3 to the database saved picture:./cc891e05-1c23-11e7-b7ec-f45c89c09e61.jpg

Paste_Image.png
Paste_Image.png
Paste_Image.png
Paste_Image.png

What do you think is difficult? Finally, we need to understand some logic problems in the Code for generating the verification code.

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