_string.py 文件源码

def syn_Subscript(self, ctx, e):
        slice_ = e.slice 
        if isinstance(slice_, ast.Ellipsis):
            raise _errors.TyError("stringing slice cannot be an Ellipsis.", e)
        elif isinstance(slice_, ast.ExtSlice):
            raise _errors.TyError("stringing slice can only have one dimension.", e)
        elif isinstance(slice_, ast.Index):
            ctx.ana(slice_.value, _numeric.num)
        else: # if isinstance(slice_, ast.Slice):
            lower, upper, step = slice_.lower, slice_.upper, slice_.step
            if lower is not None:
                ctx.ana(lower, _numeric.num)
            if upper is not None:
                ctx.ana(upper, _numeric.num)
            if not _is_None(step):
                ctx.ana(step, _numeric.num)
        return self