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使用json.loads() 函数解析json字符串报错json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 3 (char 2)import jsonstr = '''[{'type': 'O3', 'value': 3, 'collectTime': '', 'tag': ''}'''json.load(str)# 报错解决办法pip install

标题使用functools模块中的cmp_to_key函数自定义排序import functoolsdef cmp(a, b): if b < a: return -1 if a < b: return 1 return 0a = [1, 2, 5, 4]print(sorted(a, key=functools.cmp_...

from itertools import permutations, combinationsres = permutations(range(3), 2)print(list(res))# (0,1), (0,2), (1,0), (1,2), (2,0), (2,1)res = permutations([0,0,1,1], 2)print(set(list(res)))re...