Web16 mrt. 2024 · 本文是笔者重写了旧博客中的python使用set来去重碰到TypeError: unhashable type，并增加了一些更为深入的内容。. 概述. 我们在 Python 日常使用和开发中，经常会使用 set 和 dict，set 是用 dict 来实现，因为本身 dict 的 key 就是会被去重的，value 设置为 None 即可作为 set 使用。 WebSolution. To solve this problem, you can use f [“name”] as the name of the fruits_more_than_three dictionary key. Let’s look at the change in the revised code. # Fix by using the value associated with the key "name" instead of using the dictionary as the key. for f in fruits: if f ["left"] ≻ 3: fruits_more_than_three [f ["name"]] = f ...

Python初学者之TypeError: unhashable type:

http://icejoywoo.github.io/2024/03/16/python-unhashable-type-error.html Web22 feb. 2024 · 在 Python 的类型体系中，有些类型是支持计算哈希值，有些并不支持。 所以我们可以知道，使用不支持计算哈希值的类型作为 dict 或 set 的 key 就会报错。 错误案例 以下皆报错 TypeError: unhashable type: 'list' # list 作为 dict 的 key key = ["news", "hot"] news = {} news [key] = ["news_1", "news_2"] # list 作为 set 的 key 来去重 categories = … simplex innovations

Python字典的操作方法有哪些 - 开发技术 - 亿速云

Web11 apr. 2024 · A function is returning a None value instead of an iterable object. Here's an example: my_list = None a, b, c = my_list. In this case, we've assigned the value None to the variable my_list. When we try to unpack my_list into a, b, and c, Python raises a TypeError, because None is not an iterable object. This results in the following output … WebFirst, we define ‘a’ as a list of tuples to hold the key-value pairs. Next, we pass ‘list’ to defaultdict (), and store this in ‘b’. This tells the interpreter that b will hold a dictionary with values that are list. Then, we traverse on the tuples using names ‘I’ and ‘j’ with a for-loop. WebThe easiest way to fix the TypeError: unhashable type: 'list' is to use a hashable tuple instead of a non-hashable list as a dictionary key. For example, whereas d[my_list] will … rayman legends music levels