Python – 在字典值列表中将字符串转换为大写

给定带有值列表的字典，将所有字符串转换为大写。

Input : {“Gfg” : [“ab”, “cd”], “Best” : [“gh”], “is” : [“kl”]}
Output : {‘Gfg’: [‘AB’, ‘CD’], ‘Best’: [‘GH’], ‘is’: [‘KL’]}
Explanation : All value lists strings are converted to upper case.

Input : {“Gfg” : [“ab”, “cd”, “Ef”]}
Output : {‘Gfg’: [‘AB’, ‘CD’, “EF”]}
Explanation : All value lists strings are converted to upper case, already upper case have no effect.

方法#1：使用字典理解+upper()+列表理解

上述功能的组合可以用来解决这个问题。在此，我们使用 upper() 执行大写，列表推导用于遍历所有字符串，字典推导用于使用大写值重新制作字典。

Python3

# Python3 code to demonstrate working of 
# Convert Strings to Uppercase in Dictionary value lists
# Using dictionary comprehension + upper() + list comprehension
  
# initializing dictionary
test_dict = {"Gfg" : ["ab", "cd", "ef"],
             "Best" : ["gh", "ij"], "is" : ["kl"]}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# using upper to convert to upper case 
res = {key: [ele.upper() for ele in test_dict[key] ] for key in test_dict }
  
# printing result 
print("The dictionary after conversion " + str(res))

输出

The original dictionary is : {‘Gfg’: [‘ab’, ‘cd’, ‘ef’], ‘Best’: [‘gh’, ‘ij’], ‘is’: [‘kl’]}
The dictionary after conversion {‘Gfg’: [‘AB’, ‘CD’, ‘EF’], ‘Best’: [‘GH’, ‘IJ’], ‘is’: [‘KL’]}

方法 #2：使用 map() + upper() + 字典理解

上述功能的组合可以用来解决这个问题。在此，我们使用 map() 而不是列表推导来执行扩展大写逻辑的任务。

Python3

# Python3 code to demonstrate working of 
# Convert Strings to Uppercase in Dictionary value lists
# Using map() + upper() + dictionary comprehension
  
# initializing dictionary
test_dict = {"Gfg" : ["ab", "cd", "ef"],
             "Best" : ["gh", "ij"], "is" : ["kl"]}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# using map() to extend logic to all inner list 
res = {key: list(map(str.upper, test_dict[key])) for key in test_dict}
  
# printing result 
print("The dictionary after conversion " + str(res)) 

输出

The original dictionary is : {‘Gfg’: [‘ab’, ‘cd’, ‘ef’], ‘Best’: [‘gh’, ‘ij’], ‘is’: [‘kl’]}
The dictionary after conversion {‘Gfg’: [‘AB’, ‘CD’, ‘EF’], ‘Best’: [‘GH’, ‘IJ’], ‘is’: [‘KL’]}