code: def initialize_env(env_file=None, fail_silently=True, load_globally=True):
      
      data = {}
      data.update(os.environ)
      if env_file:
          data.update(read_file_values(env_file, fail_silently))
      
      if load_globally:
          os.environ.update(data)
      
      return Environment(env_dict=data)
docs: Returns an instance of _Environment after reading the system environment an
      optionally provided file.