code: def load_dot_env_file(dot_env_path):
      
      if not os.path.isfile(dot_env_path):
          return {}
  
      logger.log_info("Loading environment variables from {}".format(dot_env_path))
      env_variables_mapping = {}
  
      with io.open(dot_env_path, 'r', encoding='utf-8') as fp:
          for line in fp:
              # maxsplit=1
              if "=" in line:
                  variable, value = line.split("=", 1)
              elif ":" in line:
                  variable, value = line.split(":", 1)
              else:
                  raise exceptions.FileFormatError(".env format error")
  
              env_variables_mapping[variable.strip()] = value.strip()
  
      utils.set_os_environ(env_variables_mapping)
      return env_variables_mapping
docs: load .env file.
  
      Args:
          dot_env_path (str): .env file path
  
      Returns:
          dict: environment variables mapping
  
              {
                  "UserName": "debugtalk",
                  "Password": "123456",
                  "PROJECT_KEY": "ABCDEFGH"
              }
  
      Raises:
          exceptions.FileFormatError: If .env file format is invalid.