my_dict['my_key'] = my_list except (TypeError, ValueError) as e: print("Error:", e) 验证是否赋值成功 print(my_dict.get('my_key', 'Key not found')) 通过使用异常处理,可以确保代码的健壮性,避免在运行时发生不可预料的错误。 五、在实践中的应用 在实际应用中,将列表赋给字典中的key通常用...
传入的参数为两个列表,list1准备作为key,list2准备作为value,key和value位置一一对应。 deflist_dic(list1,list2):'''two lists merge a dict,a list as key,other list as value :param list1:key :param list2:value :return:dict'''dic= dict(map(lambdax,y:[x,y], list1,list2))returndicif_...
#根据序列(作为key),创建字典,并指定统一的值 v = dict.fromkeys(['k1',2,3], 2)#等价于v = {‘k1’:2, 2:2,3:2}
fromcollectionsimportdefaultdictdefflatten_dict(dct,parent_key='',sep='_'):flattened=defaultdict(lis...
dummy = [1,2,3]# creates a list object and assigns reference to the name 'dummy'd =dict() d['some key'] = dummy# creates the key 'some key' in the dictionary and assigns its value as the reference to the name 'dummy'dummy.append(4)# mutates the list referred to by name 'du...
Why can't I use a list as a dict key in python? Exactly what can and cannot be used, and why? Ask Question Asked 12 years, 11 months ago Modified 1 year, 2 months ago Viewed 177k times 141 I found that the following are all valid:>...
给定两个可为空的列表,生成以list1[i]的值为key,以 list2[i] 为value 方式1: defcreate_new_dict(lst1,lst2):""" lst as key, lst2 as val, return dict """res={}length1=len(lst1)length2=len(lst2)iflength1>=length2:foriinrange(0,length2):printlst1[i]res[lst1[i]]=lst2[i]...
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python 提取dict_key python 提取dataframe中某一列为list python 提取dict_key 如下所示: import numpy as np import pandas as pd from pandas import Sereis, DataFrame ser = Series(np.arange(3.)) data = DataFrame(np.arange(16).reshape(4,4),index=list('abcd'),columns=list('wxyz'))...
._asdict():将具名元组以collections.OrderedDict形式返回 —— [(key1, value1), (key2, value2), ...] # --- 平行赋值 --- lax_coordinates = (33.3, 44.4) latitude, longitude = lax_coordinates print(latitude, longitude) # --- *运算符拆包 --- def add_func(x1, x2): return x1 ...