如何检查对象是列表还是元组(而不是字符串)? [英] How to check if an object is a list or tuple (but not string)?

问题描述

这是我通常要执行的操作，以确定输入是list/tuple-而不是str.因为很多时候我偶然发现了一个错误，即一个函数错误地传递了一个str对象，而目标函数却假定lst实际上是一个list或tuple来执行for x in lst.

This is what I normally do in order to ascertain that the input is a list/tuple - but not a str. Because many times I stumbled upon bugs where a function passes a str object by mistake, and the target function does for x in lst assuming that lst is actually a list or tuple.

assert isinstance(lst, (list, tuple))

我的问题是:有没有更好的方法来实现这一目标?

My question is: is there a better way of achieving this?

推荐答案

仅在python 2中(不是python 3):

In python 2 only (not python 3):

assert not isinstance(lst, basestring)

实际上就是您想要的，否则您会错过很多像列表一样的东西，但它们不是list或tuple的子类.

Is actually what you want, otherwise you'll miss out on a lot of things which act like lists, but aren't subclasses of list or tuple.

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