Given Matrix, extract all the rows which has elements which have all elements which can be represented as dictionary key, i.e immutable.
Input : test_list = [[4, 5, [2, 3, 2]], [“gfg”, 1, (4, 4)], [{5:4}, 3, “good”], [True, “best”]]
Output : [[‘gfg’, 1, (4, 4)], [True, ‘best’]]
Explanation : All elements in tuples are immutable.
Input : test_list = [[4, 5, [2, 3, 2]], [“gfg”, 1, (4, 4), [3, 2]], [{5:4}, 3, “good”], [True, “best”]]
Output : [[True, ‘best’]]
Explanation : All elements in tuples are immutable.
Method #1 : Using all() + isinstance()
In this, we check for all elements to be of the instance of immutable data types, rows that return True for all elements, is filtered.
Python3
# Python3 code to demonstrate working of # Filter Dictionary Key Possible Element rows # Using all() + isinstance() # initializing list test_list = [[4, 5, [2, 3, 2]], ["gfg", 1, (4, 4)], [{5: 4}, 3, "good"], [ True, "best"]] # printing original list print("The original list is : " + str(test_list)) # checking for each immutable data type res = [row for row in test_list if all(isinstance(ele, int) or isinstance(ele, bool) or isinstance(ele, float) or isinstance(ele, tuple) or isinstance(ele, str) for ele in row)] # printing result print("Filtered rows : " + str(res)) |
Output:
The original list is : [[4, 5, [2, 3, 2]], [‘gfg’, 1, (4, 4)], [{5: 4}, 3, ‘good’], [True, ‘best’]]
Filtered rows : [[‘gfg’, 1, (4, 4)], [True, ‘best’]]
Method #2 : Using filter() + lambda + isinstance() + all()
In this, we perform task of filtering using filter() + lambda function, rest all functionalities are performed as above method.
Python3
# Python3 code to demonstrate working of # Filter Dictionary Key Possible Element rows # Using filter() + lambda + isinstance() + all() # initializing list test_list = [[4, 5, [2, 3, 2]], ["gfg", 1, (4, 4)], [{5: 4}, 3, "good"], [ True, "best"]] # printing original list print("The original list is : " + str(test_list)) # checking for each immutable data type # filtering using filter() res = list(filter(lambda row: all(isinstance(ele, int) or isinstance(ele, bool) or isinstance(ele, float) or isinstance(ele, tuple) or isinstance(ele, str) for ele in row), test_list)) # printing result print("Filtered rows : " + str(res)) |
Output:
The original list is : [[4, 5, [2, 3, 2]], [‘gfg’, 1, (4, 4)], [{5: 4}, 3, ‘good’], [True, ‘best’]]
Filtered rows : [[‘gfg’, 1, (4, 4)], [True, ‘best’]]
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