python3网络爬虫开发实战

适用命令行pip install tesserocr 安装tesserocr时出现报错Microsoft Windows [版本 6.1.7601]
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C:\Users\Administrator>pip install tesserocr
Collecting tesserocr
Using cached tesserocr-2.5.0.tar.gz (54 kB)
Building wheels for collected packages: tesserocr
Building wheel for tesserocr (setup.py) … error
ERROR: Command errored out with exit status 1:
command: ‘c:\users\administrator\appdata\local\programs\python\python38-32\py
thon.exe’ -u -c ‘import sys, setuptools, tokenize; sys.argv[0] = ‘"’"‘C:\Users
\Administrator\AppData\Local\Temp\pip-install-kv0214pl\tesserocr\setup.py’
"’"’; file=’"’"‘C:\Users\Administrator\AppData\Local\Temp\pip-install-
kv0214pl\tesserocr\setup.py’"’"’;f=getattr(tokenize, ‘"’"‘open’"’"’, open)(f
ile);code=f.read().replace(’"’"’\r\n’"’"’, ‘"’"’\n’"’"’);f.close();exec(compil
e(code, file, ‘"’"‘exec’"’"’))’ bdist_wheel -d ‘C:\Users\Administrator\AppDa
ta\Local\Temp\pip-wheel-ky53j_jh’
cwd: C:\Users\Administrator\AppData\Local\Temp\pip-install-kv0214pl\tesse
rocr
Complete output (12 lines):
C:\Users\Administrator\AppData\Local\Temp\pip-install-kv0214pl\tesserocr\setup
.py:72: SyntaxWarning: “is not” with a literal. Did you mean “!=”?
if subversion is not None and subversion is not “”:
C:\Users\Administrator\AppData\Local\Temp\pip-install-kv0214pl\tesserocr\setup
.py:134: DeprecationWarning: The ‘warn’ method is deprecated, use ‘warning’ inst
ead
_LOGGER.warn(‘Failed to extract tesseract version from executable: {}’.forma
t(e))
Failed to extract tesseract version from executable: [WinError 2] 系统找不到指
定的文件。
Supporting tesseract v3.04.00
Building with configs: {‘libraries’: [‘tesseract’, ‘lept’], ‘cython_compile_ti
me_env’: {‘TESSERACT_VERSION’: 50593792}}
running bdist_wheel
running build
running build_ext
building ‘tesserocr’ extension
error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C+

• Build Tools": https://visualstudio.microsoft.com/downloads/

  ERROR: Failed building wheel for tesserocr
  Running setup.py clean for tesserocr
  Failed to build tesserocr
  Installing collected packages: tesserocr
  Running setup.py install for tesserocr … error
  ERROR: Command errored out with exit status 1:
  command: ‘c:\users\administrator\appdata\local\programs\python\python38-32
  python.exe’ -u -c ‘import sys, setuptools, tokenize; sys.argv[0] = ‘"’"‘C:\User
  s\Administrator\AppData\Local\Temp\pip-install-kv0214pl\tesserocr\setup.p
  y’"’"’; file=’"’"‘C:\Users\Administrator\AppData\Local\Temp\pip-instal
  l-kv0214pl\tesserocr\setup.py’"’"’;f=getattr(tokenize, ‘"’"‘open’"’"’, open)(_
  file_);code=f.read().replace(’"’"’\r\n’"’"’, ‘"’"’\n’"’"’);f.close();exec(comp
  ile(code, file, ‘"’"‘exec’"’"’))’ install --record ‘C:\Users\Administrator\A
  ppData\Local\Temp\pip-record-8sn912s2\install-record.txt’ --single-version-exter
  nally-managed --compile --install-headers ‘c:\users\administrator\appdata\local
  programs\python\python38-32\Include\tesserocr’
  cwd: C:\Users\Administrator\AppData\Local\Temp\pip-install-kv0214pl\tes
  serocr
  Complete output (12 lines):
  C:\Users\Administrator\AppData\Local\Temp\pip-install-kv0214pl\tesserocr\set
  up.py:72: SyntaxWarning: “is not” with a literal. Did you mean “!=”?
  if subversion is not None and subversion is not “”:
  C:\Users\Administrator\AppData\Local\Temp\pip-install-kv0214pl\tesserocr\set
  up.py:134: DeprecationWarning: The ‘warn’ method is deprecated, use ‘warning’ in
  stead
  LOGGER.warn(‘Failed to extract tesseract version from executable: {}’.for
  mat(e))
  Failed to extract tesseract version from executable: [WinError 2] 系统找不到
  指定的文件。
  Supporting tesseract v3.04.00
  Building with configs: {‘libraries’: [‘tesseract’, ‘lept’], 'cython_compile
  time_env’: {‘TESSERACT_VERSION’: 50593792}}
  running install
  running build
  running build_ext
  building ‘tesserocr’ extension
  error: Microsoft Visual C++ 14.0 is required. Get it with “Microsoft Visual
  C++ Build Tools”: https://visualstudio.microsoft.com/downloads/

ERROR: Command errored out with exit status 1: ‘c:\users\administrator\appdata\l
ocal\programs\python\python38-32\python.exe’ -u -c ‘import sys, setuptools, toke
nize; sys.argv[0] = ‘"’"‘C:\Users\Administrator\AppData\Local\Temp\pip-ins
tall-kv0214pl\tesserocr\setup.py’"’"’; file=’"’"‘C:\Users\Administrator
\AppData\Local\Temp\pip-install-kv0214pl\tesserocr\setup.py’"’"’;f=getattr(
tokenize, ‘"’"‘open’"’"’, open)(file);code=f.read().replace(’"’"’\r\n’"’"’,
‘"’"’\n’"’"’);f.close();exec(compile(code, file, ‘"’"‘exec’"’"’))’ install -
-record ‘C:\Users\Administrator\AppData\Local\Temp\pip-record-8sn912s2\install-r
ecord.txt’ --single-version-externally-managed --compile --install-headers ‘c:\u
sers\administrator\appdata\local\programs\python\python38-32\Include\tesserocr’
Check the logs for full command output.

然后找了一上午的解决方法，包括寻找版本是否正确、配置环境变量等等！。
当时在找版本配置时我就奇怪为什么所有说版本配置的都是python3.7及以下的，完全没有看见有3.8版本的。只是以为没有找到最新版本的下载地址而已，于是继续去找了tesserocr-2.5.0.tar（ps:其实pip下载的也是这个版本，我下载的teseract是最新版的，不过下载旧版的估计也不行，因为我的python版本是3.8的）。下载下来的tesserocr-2.5.0.tar在命令行使用pip install +（文件名拖拽过来的地址）还是不行，报错的内容是不适应这个平台。这时我才反应过来，tesserocr可能有问题，但是我并不知道它的新名字。
兜兜转转又是重新下载旧版的teseract和tesserocr，以及按照博主的文章配置环境变量等等，还是失败了。直到找到19年的关于配置teseract出现了pyteseract才知道原来的tesserocr换了一个名字。
之后的安装过程就和书上差不多，只是将tesserocr换成pyteseract，然后使用pip安装，只是需要修改一点点内容，可以参见https://blog.youkuaiyun.com/Dongzizhu/article/details/100805894?depth_1-utm_source=distribute.pc_relevant.none-task&utm_source=distribute.pc_relevant.none-task。
还有就是image_to_text变成了image_to_string。其它的暂时没有发现问题。