# Python – Values frequency across Dictionaries lists

Given two list of dictionaries, compute frequency corresponding to each value in dictionary 1 to second.

Input : test_list1 = [{“Gfg” : 6}, {“best” : 10}], test_list2 = [{“a” : 6}, {“b” : 10}, {“d” : 6}}]
Output : {‘Gfg’: 2, ‘best’: 1}
Explanation : 6 has 2 occurrence in 2nd list, 10 has 1.

Input : test_list1 = [{“Gfg” : 6}], test_list2 = [{“a” : 6}, {“b” : 6}, {“d” : 6}}]
Output : {‘Gfg’: 3}
Explanation : 6 has 3 occurrence in 2nd list.

Method : Using dictionary comprehension + count() + list comprehension

The combination of above functionalities can be used to solve this problem. In this, we perform this task using 2 steps, in first we extract all values from second list, and then perform mapping with frequency with first dictionary using list comprehension and count().

## Python3

 `# Python3 code to demonstrate working of  ` `# Values frequency across Dictionaries lists ` `# Using list comprehension + dictionary comprehension + count() ` ` `  `# initializing lists ` `test_list1 ``=` `[{``"Gfg"` `: ``6``}, {``"is"` `: ``9``}, {``"best"` `: ``10``}] ` `test_list2 ``=` `[{``"a"` `: ``6``}, {``"b"` `: ``10``}, {``"c"` `: ``9``}, {``"d"` `: ``6``}, {``"e"` `: ``9``}, {``"f"` `: ``9``}] ` ` `  `# printing original list ` `print``(``"The original list 1 : "` `+` `str``(test_list1)) ` `print``(``"The original list 2 : "` `+` `str``(test_list2)) ` ` `  `# extracting values from target dictionary ` `temp ``=` `[val ``for` `sub ``in` `test_list2 ``for` `key, val ``in` `sub.items()] ` ` `  `# frequency mapping from 1st dictionary keys  ` `res ``=` `{key : temp.count(val) ``for` `sub ``in` `test_list1 ``for` `key, val ``in` `sub.items()} ` ` `  `# printing result  ` `print``(``"The frequency dictionary : "` `+` `str``(res)) `

Output

```The original list 1 : [{'Gfg': 6}, {'is': 9}, {'best': 10}]
The original list 2 : [{'a': 6}, {'b': 10}, {'c': 9}, {'d': 6}, {'e': 9}, {'f': 9}]
The frequency dictionary : {'Gfg': 2, 'is': 3, 'best': 1}
```
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