parameters: (self, fd)
docstring: Return the key associated to a given file descriptor.
  
          Parameters:
          fd -- file descriptor
  
          Returns:
          corresponding key, or None if not found
docstring_summary: Return the key associated to a given file descriptor.
docstring_tokens: Return the key associated to a given file descriptor .
function: def _key_from_fd(self, fd):
          """Return the key associated to a given file descriptor.
  
          Parameters:
          fd -- file descriptor
  
          Returns:
          corresponding key, or None if not found
          """
          try:
              return self._fd_to_key[fd]
          except KeyError:
              return None
function_tokens: def _key_from_fd ( self , fd ) : try : return self . _fd_to_key [ fd ] except KeyError : return None