code: def github_token(token_path=None, token=None):
      
      if token is None:
          if token_path is None:
              # Try the default token
              token_path = '~/.sq_github_token'
          token_path = os.path.expandvars(os.path.expanduser(token_path))
  
          if not os.path.isfile(token_path):
              print("You don't have a token in {0} ".format(token_path))
              print("Have you run github-auth?")
              raise EnvironmentError("No token in %s" % token_path)
  
          with open(token_path, 'r') as fdo:
              token = fdo.readline().strip()
  
      return token
docs: Return a github oauth token as a string.  If `token` is defined, it is
      has precendece.  If `token` and `token_path` are `None`,
      `~/.sq_github_token` looked for as a fallback.
  
      Parameters
      ----------
      token_path : str, optional
          Path to the token file. The default token is used otherwise.
  
      token: str, optional
          Literial token string. If specifified, this value is used instead of
          reading from the token_path file.
  
      Returns
      -------
      token : `string`
          Hopefully, a valid github oauth token.