要修改pytesser.py文件，tesseract_exe_name为绝对路径：
tesseract_exe_name = 'D:\Python27\Lib\site-packages\pytesser_v0.0.1\tesseract' # Name of executable to be called at command line
网上百家言，有时候要综合好几个来试，路漫漫其修远兮