Python实现合并两个字典的8种方法

def merge(dict1, dict2):  
return(dict2.update(dict1))  
  
# Driver code  
dict1 = {'a': 10, 'b': 8}  
dict2 = {'d': 6, 'c': 4}  
  
# This returns None  
print(merge(dict1, dict2))  
  
# changes made in dict2  
print(dict2)

def merge(dict1, dict2):  
res = {**dict1, **dict2}  
  return res  
  
# Driver code  
dict1 = {'a': 10, 'b': 8}  
dict2 = {'d': 6, 'c': 4}  
dict3 = merge(dict1, dict2)  
print(dict3)  

def merge(dict1, dict2):  
    res = dict1 | dict2  
    return res  
  
# Driver code  
dict1 = {'x': 10, 'y': 8}  
dict2 = {'a': 6, 'b': 4}  
dict3 = merge(dict1, dict2)  
print(dict3)  

def merge(dict1, dict2):  
    for i in dict2.keys():  
        dict1[i]=dict2[i]  
    return dict1  
  
# Driver code  
dict1 = {'x': 10, 'y': 8}  
dict2 = {'a': 6, 'b': 4}  
dict3 = merge(dict1, dict2)  
print(dict3)

from collections import ChainMap  
  
# create the dictionaries to be merged  
dict1 = {'a': 1, 'b': 2}  
dict2 = {'c': 3, 'd': 4}  
  
# create a ChainMap with the dictionaries as elements  
merged_dict = ChainMap(dict1, dict2)  
  
# access and modify elements in the merged dictionary  
print(merged_dict['a'])  # prints 1  
print(merged_dict['c'])  # prints 3  
merged_dict['c'] = 5  # updates value in dict2  
print(merged_dict['c'])  # prints 5  
  
# add a new key-value pair to the merged dictionary  
merged_dict['e'] = 6  # updates dict1  
print(merged_dict['e'])  # prints 6

def merge_dictionaries(dict1, dict2):  
    merged_dict = dict1.copy()  
    merged_dict.update(dict2)  
    return merged_dict  
  
# Driver code  
dict1 = {'x': 10, 'y': 8}  
dict2 = {'a': 6, 'b': 4}  
  
print(merge_dictionaries(dict1, dict2))

# method to merge two dictionaries using the dict() constructor with the union operator (|)  
def merge(dict1, dict2):  
    # create a new dictionary by merging the items of the two dictionaries using the union operator (|)  
    merged_dict = dict(dict1.items() | dict2.items())  
    # return the merged dictionary  
    return merged_dict  
  
# Driver code  
dict1 = {'a': 10, 'b': 8}  
dict2 = {'d': 6, 'c': 4}  
  
# merge the two dictionaries using the Merge() function  
merged_dict = merge(dict1, dict2)  
  
# print the merged dictionary  
print(merged_dict)

from functools import reduce  
  
def merge_dictionaries(dict1, dict2):  
    merged_dict = dict1.copy()  
    merged_dict.update(dict2)  
    return merged_dict  
 
   
dict1 = {'a': 10, 'b': 8}  
dict2 = {'d': 6, 'c': 4}  
  
dict_list = [dict1, dict2]  # Put the dictionaries into a list  
  
result_dict = reduce(merge_dictionaries, dict_list)  
  
print(result_dict)