parameters: (self, filename)
return_statement: return ext in _file_openers.keys()
docstring: Test if the filename is a zip file by looking at the file extension.
docstring_summary: Test if the filename is a zip file by looking at the file extension.
docstring_tokens: Test if the filename is a zip file by looking at the file extension .
function: def _iszip(self, filename):
          """Test if the filename is a zip file by looking at the file extension.
          """
          fname, ext = os.path.splitext(filename)
          return ext in _file_openers.keys()
function_tokens: def _iszip ( self , filename ) : fname , ext = os . path . splitext ( filename ) return ext in _file_openers . keys ( )