(e)
return all(_is_Expr(i) for i in e.args)
_eapply helper to tell whether ``e`` and all its args
    are Exprs.
_eapply helper to tell whether ``e`` and all its args
    are Exprs.
_eapply helper to tell whether e and all its args are Exprs .
def _is_Expr(e):
    """_eapply helper to tell whether ``e`` and all its args
    are Exprs."""
    if not isinstance(e, Expr):
        return False
    return all(_is_Expr(i) for i in e.args)
def _is_Expr ( e ) : if not isinstance ( e , Expr ) : return False return all ( _is_Expr ( i ) for i in e . args )