自動生成驗證碼

 import random
    # 定義變量，用於畫面的背景色、寬、高
    bgcolor = (random.randrange(20, 100), random.randrange(
        20, 100), 255)
    width = 100
    height = 25
    # 創建畫面對象
    im = Image.new('RGB', (width, height), bgcolor)
    # 創建畫筆對象
    draw = ImageDraw.Draw(im)
    # 調用畫筆的point()函數繪製噪點
    for i in range(0, 100):
        xy = (random.randrange(0, width), random.randrange(0, height))
        fill = (random.randrange(0, 255), 255, random.randrange(0, 255))
        draw.point(xy, fill=fill)
    # 定義驗證碼的備選值
    str1 = 'ABCD123EFGHIJK456LMNOPQRS789TUVWXYZ0'
    # 隨機選取4個值作爲驗證碼
    rand_str = ''
    for i in range(0, 4):
        rand_str += str1[random.randrange(0, len(str1))]
    # 構造字體對象，ubuntu的字體路徑爲“/usr/share/fonts/truetype/freefont”
    font = ImageFont.load_default().font
    # 構造字體顏色
    fontcolor = (255, random.randrange(0, 255), random.randrange(0, 255))
    # 繪製4個字
    draw.text((5, 2), rand_str[0], font=font, fill=fontcolor)
    draw.text((25, 2), rand_str[1], font=font, fill=fontcolor)
    draw.text((50, 2), rand_str[2], font=font, fill=fontcolor)
    draw.text((75, 2), rand_str[3], font=font, fill=fontcolor)
    # 釋放畫筆
    del draw