用字典中的子串提取键值对的Python程序
给定一个字典列表，提取在特定键中存在子字符串的所有字典。
Input : [{“Gfg” : “4”, “best” : “1”}, {“Gfg” : “good CS content”, “best” : “10”}], K = “Gfg”, sub_str = “CS”
Output : [{‘Gfg’: ‘good CS content’, ‘best’: ’10’}]
Explanation : “Gfg” has “CS” as substring value.
Input : [{“Gfg” : “4”, “best” : “1”}, {“Gfg” : “good content”, “best” : “10”}], K = “Gfg”, sub_str = “CS”
Output : []
Explanation : No dictionary with “CS” as substring to “Gfg” key.
方法#1：使用列表理解
这是可以执行此任务的方法之一。在此，我们迭代所有字典并使用 in运算符检查键的值子字符串是否存在。
Python3
# Python3 code to demonstrate working of
# Dictionaries with Substring values
# Using list comprehension
# initializing lists
test_list = [{"Gfg": "4", "best": "1"},
{"Gfg": "good for CS", "best": "8"},
{"Gfg": "good CS content", "best": "10"}]
# printing original list
print("The original list : " + str(test_list))
# initializing K key
K = "Gfg"
# initializing target value
sub_str = "CS"
# list comprehension to extract values with
# substring values using in operator
res = [val for val in test_list if sub_str in val[K]]
# printing result
print("Dictionaries with particular substring values : " + str(res))Python3
# Python3 code to demonstrate working of
# Dictionaries with Substring values
# Using map() + in operator
# initializing lists
test_list = [{"Gfg": "4", "best": "1"},
{"Gfg": "good for CS", "best": "8"},
{"Gfg": "good CS content", "best": "10"}]
# printing original list
print("The original list : " + str(test_list))
# initializing K key
K = "Gfg"
# initializing target value
val = "CS"
# map() used to perform filtering
res = list(map(lambda sub: val in sub[K], test_list))
res = [test_list[idx] for idx, ele in enumerate(res) if res[idx]]
# printing result
print("Dictionaries with particular substring values : " + str(res))输出：
The original list : [{‘Gfg’: ‘4’, ‘best’: ‘1’}, {‘Gfg’: ‘good for CS’, ‘best’: ‘8’}, {‘Gfg’: ‘good CS content’, ‘best’: ’10’}]
Dictionaries with particular substring values : [{‘Gfg’: ‘good for CS’, ‘best’: ‘8’}, {‘Gfg’: ‘good CS content’, ‘best’: ’10’}]
方法#2：使用 map() + in运算符
这是可以执行此任务的另一种方式。在此，我们使用 map() + lambda函数提取具有所需子字符串的所有值。 in运算符用于检查键值中的子字符串。
蟒蛇3
# Python3 code to demonstrate working of
# Dictionaries with Substring values
# Using map() + in operator
# initializing lists
test_list = [{"Gfg": "4", "best": "1"},
{"Gfg": "good for CS", "best": "8"},
{"Gfg": "good CS content", "best": "10"}]
# printing original list
print("The original list : " + str(test_list))
# initializing K key
K = "Gfg"
# initializing target value
val = "CS"
# map() used to perform filtering
res = list(map(lambda sub: val in sub[K], test_list))
res = [test_list[idx] for idx, ele in enumerate(res) if res[idx]]
# printing result
print("Dictionaries with particular substring values : " + str(res))
输出：
The original list : [{‘Gfg’: ‘4’, ‘best’: ‘1’}, {‘Gfg’: ‘good for CS’, ‘best’: ‘8’}, {‘Gfg’: ‘good CS content’, ‘best’: ’10’}]
Dictionaries with particular substring values : [{‘Gfg’: ‘good for CS’, ‘best’: ‘8’}, {‘Gfg’: ‘good CS content’, ‘best’: ’10’}]