When it is required to filter the tuples by the 'K'th element from a list, list comprehension and 'in' operators can be used.
A list can be used to store heterogeneous values (i.e data of any data type like integer, floating point, strings, and so on).
A list of tuple basically contains tuples enclosed in a list. The 'in' operators checks to see if the specific data is present in the iterable/data or not.
The list comprehension is a shorthand to iterate through the list and perform operations on it.
Below is a demonstration of the same −
Example
my_list = [(1, 21), (25, 'abc', 'mnq'), (89, 45.65)]
print("The check list has been initialized")
check_list = [1, 25, 10, 21]
print("The list is :")
print(my_list)
k=1
print("The 'k' value has been initialized to 1")
my_result = [elem for elem in my_list if elem[k] in check_list]
print("The filtered tuples are : ")
print(my_result)Output
The check list has been initialized The list is : [(1, 21), (25, 'abc', 'mnq'), (89, 45.65)] The 'k' value has been initialized to 1 The filtered tuples are : [(1, 21)]
Explanation
- A list of tuple is defined, and displayed on the console.
- Another list is defined, and displayed on the console.
- The value of 'k' is initialized.
- The lists are iterated over to check if the element in the second list is present in the first list.
- If it is present, it is retained in the list, else it is eliminated
- This is then converted to a list.
- This operation is assigned to a variable.
- This variable is the output that is displayed on the console.