Python Program to find tuple indices from other tuple list
Given Tuples list and search list consisting of tuples to search, our task is to write a Python Program to extract indices of matching tuples.
Input : test_list = [(4, 5), (7, 6), (1, 0), (3, 4)], search_tup = [(3, 4), (8, 9), (7, 6), (1, 2)]
Output : [3, 1]
Explanation : (3, 4) from search list is found on 3rd index on test_list, hence included in result.
Input : test_list = [(4, 5), (7, 6), (1, 0), (3, 4)], search_tup = [(3, 4), (8, 9), (7, 6), (1, 0)]
Output : [3, 1, 2]
Explanation : (3, 4) from search list is found on 3rd index on test_list, hence included in result.
Method #1 : Using lookup dictionary + enumerate() + list comprehension
In this, a lookup dictionary is formed to map all the tuples with matching one’s indices. Then lookup dictionary is used to get indices of mapped tuples as result using list comprehension.
Python3
# Python3 code to demonstrate working of# Find tuple indices from other tuple list# Using lookup dictionary + enumerate() + list comprehension # initializing listtest_list = [(4, 5), (7, 6), (1, 0), (3, 4)] # printing original listprint("The original list is : " + str(test_list)) # initializing search tuple search_tup = [(3, 4), (8, 9), (7, 6), (1, 2)] # creating lookup_dictlookup_dict = {val: key for key,val in enumerate(test_list)} # creating result listres = [lookup_dict[idx] for idx in search_tup if idx in lookup_dict] # printing resultprint("The match tuple indices : " + str(res)) |
Output:
The original list is : [(4, 5), (7, 6), (1, 0), (3, 4)] The match tuple indices : [3, 1]
Method #2 : Using list comprehension + enumerate()
In this, we perform the task of getting indices using enumerate(), and list comprehension is used for the task of iteration of all the elements of tuple and matching for equality.
Python3
# Python3 code to demonstrate working of# Find tuple indices from other tuple list# Using list comprehension + enumerate() # initializing listtest_list = [(4, 5), (7, 6), (1, 0), (3, 4)] # printing original listprint("The original list is : " + str(test_list)) # initializing search tuple search_tup = [(3, 4), (8, 9), (7, 6), (1, 2)] # enumerate() gets all the indices res = [idx for idx, val in enumerate(test_list) for ele in search_tup if ele == val] # printing resultprint("The match tuple indices : " + str(res)) |
Output:
The original list is : [(4, 5), (7, 6), (1, 0), (3, 4)] The match tuple indices : [1, 3]
