# Python – Test Record existence in Dictionary

• Last Updated : 03 Jun, 2021

Sometimes while working with pool of records, we can have problem in which we need to check the presence of particular value of a key for existence. This can have application in many domains such as day-day programming or web development. Lets discuss certain ways in which this task can be performed.
Method #1 : Using any() + generator expression
The combination of above functions can be used to perform this task. In this, we simply test for all elements using any(), iterated using generator expression.

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## Python3

 `# Python3 code to demonstrate working of``# Test Record existence in Dictionary``# Using any() + generator expression` `# initializing list``test_list ``=` `[{ ``'name'` `: ``'Nikhil'``, ``'age'` `: ``22``},``             ``{ ``'name'` `: ``'Akshat'``, ``'age'` `: ``23``},``             ``{ ``'name'` `: ``'Akash'``, ``'age'` `: ``23``}]`  `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))` `# initializing key and value``test_key ``=` `'name'``test_val ``=` `'Nikhil'` `# Test Record existence in Dictionary``# Using any() + generator expression``res ``=` `any``(sub[test_key] ``=``=` `test_val ``for` `sub ``in` `test_list)` `# printing result``print``(``"Does key value contain in dictionary list : "` `+` `str``(res))`
Output :

The original list is : [{‘name’: ‘Nikhil’, ‘age’: 22}, {‘name’: ‘Akshat’, ‘age’: 23}, {‘name’: ‘Akash’, ‘age’: 23}]
Does key value contain in dictionary list : True

Method #2 : Using filter() + lambda
The combination of above functions can be used to perform this task. In this, we check for all values using filter and iteration using lambda function.

## Python3

 `# Python3 code to demonstrate working of``# Test Record existence in Dictionary``# Using filter() + lambda` `# initializing list``test_list ``=` `[{ ``'name'` `: ``'Nikhil'``, ``'age'` `: ``22``},``             ``{ ``'name'` `: ``'Akshat'``, ``'age'` `: ``23``},``             ``{ ``'name'` `: ``'Akash'``, ``'age'` `: ``23``}]`  `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))` `# initializing key and value``test_key ``=` `'name'``test_val ``=` `'Nikhil'` `# Test Record existence in Dictionary``# Using filter() + lambda``res ``=` `filter``(``lambda` `sub: test_val ``in` `sub.values(), test_list)``if` `len``(``list``(res)):``    ``res ``=` `True``else` `:``    ``res ``=` `False` `# printing result``print``(``"Does key value contain in dictionary list : "` `+` `str``(res))`
Output :

The original list is : [{‘name’: ‘Nikhil’, ‘age’: 22}, {‘name’: ‘Akshat’, ‘age’: 23}, {‘name’: ‘Akash’, ‘age’: 23}]
Does key value contain in dictionary list : True

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