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      什么是真假?它与真假有什么不同?

      时间:2024-04-21

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                本文介绍了什么是真假?它与真假有什么不同?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                问题描述

                I just learned there are truthy and falsy values in python which are different from the normal True and False.

                Can someone please explain in depth what truthy and falsy values are? Where should I use them? What is the difference between truthy and True values and falsy and False values?

                解决方案

                As the comments described, it just refers to values which are evaluated to True or False.

                For instance, to see if a list is not empty, instead of checking like this:

                if len(my_list) != 0:
                   print("Not empty!")
                

                You can simply do this:

                if my_list:
                   print("Not empty!")
                

                This is because some values, such as empty lists, are considered False when evaluated for a boolean value. Non-empty lists are True.

                Similarly for the integer 0, the empty string "", and so on, for False, and non-zero integers, non-empty strings, and so on, for True.

                The idea of terms like "truthy" and "falsy" simply refer to those values which are considered True in cases like those described above, and those which are considered False.

                For example, an empty list ([]) is considered "falsy", and a non-empty list (for example, [1]) is considered "truthy".

                See also this section of the documentation.

                这篇关于什么是真假?它与真假有什么不同?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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