# Python – Test if common values are greater than K

• Last Updated : 01 Mar, 2020

Sometimes, while working with Lists, we can have a problem in which we need to track common elements in list. This is quite common and we often have constructs to solve this. But sometimes, we require to consider two list as matching if they contain aleast K matching elements. Lets discuss certain ways in which this can be performed.

Method #1 : Using `set() + len()`
The combination of above methods can be used to solve this task. In this we first convert each list into set and then use len() to check if matching elements are greater than K.

 `# Python3 code to demonstrate ``# Test if common values are greater than K``# using len() + set()`` ` `# Initializing lists``test_list1 ``=` `[``'Gfg'``, ``'is'``, ``'for'``, ``'Geeks'``]``test_list2 ``=` `[``1``, ``'Gfg'``, ``2``, ``'Geeks'``]`` ` `# printing original lists``print``(``"The original list 1 is : "` `+` `str``(test_list1))``print``(``"The original list 2 is : "` `+` `str``(test_list2))`` ` `# Initializing K ``K ``=` `2`` ` `# Test if common values are greater than K``# using len() + set()``res ``=` `len``(``set``(test_list1) & ``set``(test_list2)) >``=` `K`` ` `# printing result ``print` `(``"Are common elements greater than K ? : "` `+` `str``(res))`
Output :
```The original list 1 is : ['Gfg', 'is', 'for', 'Geeks']
The original list 2 is : [1, 'Gfg', 2, 'Geeks']
Are common elements greater than K ? : True
```

Method #2 : Using `sum()`
This is yet another way in which this problem can be solved. In this, we just take count of all the column elements and sum them using sum() and then check with K.

 `# Python3 code to demonstrate ``# Test if common values are greater than K``# using sum()`` ` `# Initializing lists``test_list1 ``=` `[``'Gfg'``, ``'is'``, ``'for'``, ``'Geeks'``]``test_list2 ``=` `[``1``, ``'Gfg'``, ``2``, ``'Geeks'``]`` ` `# printing original lists``print``(``"The original list 1 is : "` `+` `str``(test_list1))``print``(``"The original list 2 is : "` `+` `str``(test_list2))`` ` `# Initializing K ``K ``=` `2`` ` `# Test if common values are greater than K``# using sum()``res ``=` `sum``(i ``in` `test_list1 ``for` `i ``in` `test_list2) >``=` `2`` ` `# printing result ``print` `(``"Are common elements greater than K ? : "` `+` `str``(res))`
Output :
```The original list 1 is : ['Gfg', 'is', 'for', 'Geeks']
The original list 2 is : [1, 'Gfg', 2, 'Geeks']
Are common elements greater than K ? : True
```

My Personal Notes arrow_drop_up