Python - Extract digits from Tuple list

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))  

Output :

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))  

Output :

The original list is : [(15, 3), (3, 9), (1, 10), (99, 2)]
The extrated digits : [5, 1, 2, 0, 9, 3]

My Personal Notes

Python – Extract digits from Tuple list

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