Sometimes, while working with Python lists, we can have a problem in which we need to perform extraction of all the digits from tuple list. This kind of problem can find its application in data domains and day-day programming. Let’s discuss certain ways in which this task can be performed.
Input : test_list = [(15, 3), (3, 9)]
Output : [9, 5, 3, 1]Input : test_list = [(15, 3)]
Output : [5, 3, 1]
Method #1 : Using map() + chain.from_iterable() + set() + loop
The combination of above functions can be used to solve this problem. In this, we perform the task of flattening list using chain.from_iterable(), and then the digits are extracted using brute method. set() is used to remove duplicate digits.
# Python3 code to demonstrate working of # Extract digits from Tuple list # Using map() + chain.from_iterable() + set() + loop from itertools import chain # initializing list test_list = [(15, 3), (3, 9), (1, 10), (99, 2)] # printing original list print("The original list is : " + str(test_list)) # Extract digits from Tuple list # Using map() + chain.from_iterable() + set() + loop temp = map(lambda ele: str(ele), chain.from_iterable(test_list)) res = set() for sub in temp: for ele in sub: res.add(ele) # printing result print("The extrated digits : " + str(res)) |
The original list is : [(15, 3), (3, 9), (1, 10), (99, 2)]
The extrated digits : {'0', '5', '3', '1', '2', '9'}
Method #2 : Using regex expression
This is yet another way in which this task can be performed. In this, appropriate regex expression is used to extract the required unique digits.
# Python3 code to demonstrate working of # Extract digits from Tuple list # Using regex expression import re # initializing list test_list = [(15, 3), (3, 9), (1, 10), (99, 2)] # printing original list print("The original list is : " + str(test_list)) # Extract digits from Tuple list # Using regex expression temp = re.sub(r'[\[\]\(\), ]', '', str(test_list)) res = [int(ele) for ele in set(temp)] # printing result print("The extrated digits : " + str(res)) |
The original list is : [(15, 3), (3, 9), (1, 10), (99, 2)] The extrated digits : [5, 1, 2, 0, 9, 3]
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