Pyinstaller --- executable file with Google API --- obstacles I have:

• The first one we come across in many cases should be:

  pkg_resources.DistributionNotFound: The [distribution name] distribution was not found 
  

  where [distribution name] is among $\{$google-*-core, google-cloud-* $\}$ for various possible *. The first strategy is reinstallation. To somebody reinstalling the package in trouble will do. To me, I completely reinstall Python from 3.8 to just 3.7.5.
  
  And in order to keep projects' dependency separate enough, the first package I download is pipenv and installation of the second first package is done in pipenv shell.
• No module named [sth], to me [sth]'s are respectively google and then google.cloud. I have tried to edit .spec to include these packages as hiddenimports then pyinstaller xxx.spec.
  
  If problem persists, try to pip show [missing package] to get the location of problematic package, then add this location to pathex. In my case reinstalling Python gets rid of all the problems in this bullet point.
• After reinstallation, we have a very clean environment, the only problem left to me is again the google-cloud-vision, which is solved by adding hook-google.cloud.py the following
  
  
     data += copy_metadata('google-cloud-vision')


• After we get through all the trouble and successfully build an executable file, we may next encounter :

  Error: Exception in 'grpc._cython.cygrpc.ssl ............ pem_root_certs != nullptr

  To this we create a hook-grpc.py and type the following:

  from PyInstaller.utils.hooks import collect_data_files
  datas = collect_data_files('grpc')
  

At this point my journey battling with pyinstaller and google api is done, which spent me half of a day to get around all of these problems..., hope this article helps.