parameters: (self, msg=None)
docstring: Internal: raise an IOError if file is not readable
docstring_summary: Internal: raise an IOError if file is not readable
docstring_tokens: Internal : raise an IOError if file is not readable
function: def _checkReadable(self, msg=None):
          """Internal: raise an IOError if file is not readable
          """
          if not self.readable():
              raise IOError("File or stream is not readable."
                            if msg is None else msg)
function_tokens: def _checkReadable ( self , msg = None ) : if not self . readable ( ) : raise IOError ( "File or stream is not readable." if msg is None else msg )