Python – 从其他字典中替换字典值

给定两个字典，如果键存在于其他字典中，则更新其他字典中的值。

Input : test_dict = {“Gfg” : 5, “is” : 8, “Best” : 10, “for” : 8, “Geeks” : 9},
updict = {“Geeks” : 10, “Best” : 17}
Output : {‘Gfg’: 5, ‘is’: 8, ‘Best’: 17, ‘for’: 8, ‘Geeks’: 10}
Explanation : “Geeks” and “Best” values updated to 10 and 17.

Input : test_dict = {“Gfg” : 5, “is” : 8, “Best” : 10, “for” : 8, “Geeks” : 9},
updict = {“Geek” : 10, “Bet” : 17}
Output : {‘Gfg’: 5, ‘is’: 8, ‘Best’: 10, ‘for’: 8, ‘Geeks’: 9}
Explanation : No values matched, hence original dictionary.

方法#1：使用循环

这是可以执行此任务的粗暴方式。在此，我们为目标字典中的每个键运行一个循环，并在该值存在于其他字典中的情况下进行更新。

Python3

# Python3 code to demonstrate working of 
# Replace dictionary value from other dictionary
# Using loop
  
# initializing dictionary
test_dict = {"Gfg" : 5, "is" : 8, "Best" : 10, "for" : 8, "Geeks" : 9}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# initializing updict
updict = {"Gfg"  : 10, "Best" : 17}
  
for sub in test_dict:
      
    # checking if key present in other dictionary
    if sub in updict:
        test_dict[sub]  = updict[sub]
  
# printing result 
print("The updated dictionary: " + str(test_dict))

输出

The original dictionary is : {‘Gfg’: 5, ‘is’: 8, ‘Best’: 10, ‘for’: 8, ‘Geeks’: 9}
The updated dictionary: {‘Gfg’: 10, ‘is’: 8, ‘Best’: 17, ‘for’: 8, ‘Geeks’: 9}

方法#2：使用字典理解

这是可以执行此任务的一种线性方法。在此，我们迭代所有字典值并在字典理解中以单线方式更新。

Python3

# Python3 code to demonstrate working of 
# Replace dictionary value from other dictionary
# Using dictionary comprehension
  
# initializing dictionary
test_dict = {"Gfg" : 5, "is" : 8, "Best" : 10, "for" : 8, "Geeks" : 9}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# initializing updict
updict = {"Gfg"  : 10, "Best" : 17}
  
res = {key: updict.get(key, test_dict[key]) for key in test_dict}
  
# printing result 
print("The updated dictionary: " + str(res)) 

输出

The original dictionary is : {‘Gfg’: 5, ‘is’: 8, ‘Best’: 10, ‘for’: 8, ‘Geeks’: 9}
The updated dictionary: {‘Gfg’: 10, ‘is’: 8, ‘Best’: 17, ‘for’: 8, ‘Geeks’: 9}