Function example code of django implementing verification code in python

This article mainly introduces the function example code of python django to implement Verification Code, which has certain reference value. Interested friends can For reference

I have just learned Python and don’t understand much of Django soon, so now I want to record it while learning and discuss it with everyone!

Verification code function At the beginning, I found a lot of demos on the Internet, but when I imitated their writing, I found that it could not run on my version. When the front-end page was displayed, the image was cracked. Maybe it’s because I’m using Python 3.5 and Django is version 1.10. I looked at a lot of versions last night and they are all 2.7, so I asked a lot of seniors and experts and finally found out the reason. I’ve got the code. I'll post it below.

This is my project directory.

#To successfully display the verification code, you must have a verification code Generator, so you need to write a verification code generator. I created a new py file check_coed.py file in the app, which is the verification code generator. The code is as follows

import random
from PIL import Image, ImageDraw, ImageFont, ImageFilter

_letter_cases = "abcdefghjkmnpqrstuvwxy" # 小写字母，去除可能干扰的i，l，o，z
_upper_cases = _letter_cases.upper() # 大写字母
_numbers = ''.join(map(str, range(3, 10))) # 数字
init_chars = ''.join((_letter_cases, _upper_cases, _numbers))

def create_validate_code(size=(120, 30),
       chars=init_chars,
       img_type="GIF",
       mode="RGB",
       bg_color=(255, 255, 255),
       fg_color=(0, 0, 255),
       font_size=18,
       font_type="Monaco.ttf",
       length=4,
       draw_lines=True,
       n_line=(1, 2),
       draw_points=True,
       point_chance=2):
 """
 @todo: 生成验证码图片
 @param size: 图片的大小，格式（宽，高），默认为(120, 30)
 @param chars: 允许的字符集合，格式字符串
 @param img_type: 图片保存的格式，默认为GIF，可选的为GIF，JPEG，TIFF，PNG
 @param mode: 图片模式，默认为RGB
 @param bg_color: 背景颜色，默认为白色
 @param fg_color: 前景色，验证码字符颜色，默认为蓝色#0000FF
 @param font_size: 验证码字体大小
 @param font_type: 验证码字体，默认为 ae_AlArabiya.ttf
 @param length: 验证码字符个数
 @param draw_lines: 是否划干扰线
 @param n_lines: 干扰线的条数范围，格式元组，默认为(1, 2)，只有draw_lines为True时有效
 @param draw_points: 是否画干扰点
 @param point_chance: 干扰点出现的概率，大小范围[0, 100]
 @return: [0]: PIL Image实例
 @return: [1]: 验证码图片中的字符串
 """

 width, height = size # 宽高
 # 创建图形
 img = Image.new(mode, size, bg_color)
 draw = ImageDraw.Draw(img) # 创建画笔

 def get_chars():
  """生成给定长度的字符串，返回列表格式"""
  return random.sample(chars, length)

 def create_lines():
  """绘制干扰线"""
  line_num = random.randint(*n_line) # 干扰线条数

  for i in range(line_num):
   # 起始点
   begin = (random.randint(0, size[0]), random.randint(0, size[1]))
   # 结束点
   end = (random.randint(0, size[0]), random.randint(0, size[1]))
   draw.line([begin, end], fill=(0, 0, 0))

 def create_points():
  """绘制干扰点"""
  chance = min(100, max(0, int(point_chance))) # 大小限制在[0, 100]

  for w in range(width):
   for h in range(height):
    tmp = random.randint(0, 100)
    if tmp > 100 - chance:
     draw.point((w, h), fill=(0, 0, 0))

 def create_strs():
  """绘制验证码字符"""
  c_chars = get_chars()
  strs = ' %s ' % ' '.join(c_chars) # 每个字符前后以空格隔开

  # font = ImageFont.truetype(font_type, font_size)
  font = ImageFont.load_default().font
  font_width, font_height = font.getsize(strs)

  draw.text(((width - font_width) / 3, (height - font_height) / 3),
     strs, font=font, fill=fg_color)

  return ''.join(c_chars)

 if draw_lines:
  create_lines()
 if draw_points:
  create_points()
 strs = create_strs()

 # 图形扭曲参数
params = [1 - float(random.randint(1, 2)) / 100,0, 0, 0,1 - float(random.randint(1, 10)) / 100,float(random.randint(1, 2)) / 500, 0.001,float(random.randint(1, 2)) / 500] 
img = img.transform(size, Image.PERSPECTIVE, params) # 创建扭曲 
img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) # 滤镜，边界加强（阈值更大）

In the html front-end

You don’t need to add the last few sentences in the front-end, but for the sake of formality, add them. In this way, the verification code can be refreshed

The project is almost completed here, but there is still a font file missing, so that the font can be adjusted up or down and the font can be set at will. This can be downloaded online, so I won’t post it here. The file name is

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