@RoyalSwish: As for why Python was designed that way, there are multiple reasons, too complicated to explain in an SO comment. But a really brief, inaccurate summary: It makes the errors in mixing up mutating vs. non-mutating methods obvious (they show up on the line that's wrong, not 30 lines later in another function).
This is probably unhelpful until you point out how people might end up getting a None out of something. An explicit foo = None is unlikely to be the problem; it's going to be foo = something() and you don't realize something() might return None when it doesn't succeed or the result set was empty or whatever. – tripleee
The problem is that grid returns None , not self . So, when you do this: decimalView = ttk.Entry(mainframe, state = DISABLED, background = "gray99", ...
26.07.2018 · 今天看python爬虫的视频，然后按照视频上的内容编写代码，运行时出现了AttributeError: 'NoneType' object has no attribute 'children'错误提示，看了好久代码也没发现错误，百度了网上有个博主发布了一条博客，发现他也是一样的错误，看了他的博客，然后再看我的代码，发现我们都是同一个单词写错了，代码 ...
I'm trying to place a scrollbar on a DISABLED Entry widget. However it keeps coming up with the error AttributeError: 'NoneType' object has no attribute ...