centos环境下 pytesseract.image_to_string() 发生OSError: [Errno 2] No such file or directory

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word = pytesseract.image_to_string(bw)

File "/usr/lib/python2.7/site-packages/pytesseract/pytesseract.py", line 193, in image_to_string

return run_and_get_output(image, 'txt', lang, config, nice)

File "/usr/lib/python2.7/site-packages/pytesseract/pytesseract.py", line 140, in run_and_get_output

run_tesseract(**kwargs)

File "/usr/lib/python2.7/site-packages/pytesseract/pytesseract.py", line 111, in run_tesseract

proc = subprocess.Popen(command, stderr=subprocess.PIPE)

File "/usr/lib64/python2.7/subprocess.py", line 711, in __init__

errread, errwrite)

File "/usr/lib64/python2.7/subprocess.py", line 1327, in _execute_child

raise child_exception

OSError: [Errno 2] No such file or directory

经查询，centos环境下执行：yum install tesseract 

安装tesseract 即可。