全自动区分计算机和人类的公开图灵测试（Completely Automated Public Turing test to tell Computers and Humans Apart）

简称CAPTCHA, 俗称验证码

windows

1.安装tesseract, 

安装路径加入path, 设置TESSDATA_PREFIX环境变量

否则报错：

‘Error opening data file \\exe\\Tesseract-OCR\\tessdata/eng.traineddata
Please make sure the TESSDATA_PREFIX environment variable is set to the parent directory of your "tessdata" directory.
Failed loading language \\‘eng\\‘
Tesseract couldn\\‘t load any languages!
Could not initialize tesseract.
‘

2.pip install pytesseract  

python使用tesseract-ocr完成验证码识别