special.py 文件源码

def Subscript_slice(t, x):

    if isinstance(x.slice, ast.Slice):
        slice = x.slice
        t.unsupported(x, slice.step and slice.step != 1, "Slice step is unsupported")
        args = []
        if slice.lower:
            args.append(slice.lower)
        else:
            args.append(JSNum(0))
        if slice.upper:
            args.append(slice.upper)

        return JSCall(JSAttribute(x.value, 'slice'), args)