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# Python – Extract digits from Tuple list

• Last Updated : 12 Aug, 2021

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

 `# 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 extracted digits : "` `+` `str``(res))`
Output

```The original list is : [(15, 3), (3, 9), (1, 10), (99, 2)]
The extracted digits : {'1', '0', '3', '2', '9', '5'}```

Method #2: Using regex expression
This is yet another way in which this task can be performed. In this, an appropriate regex expression is used to extract the required unique digits.

## Python3

 `# 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 extracted digits : "` `+` `str``(res))`
Output
```The original list is : [(15, 3), (3, 9), (1, 10), (99, 2)]
The extracted digits : [5, 9, 2, 0, 1, 3]```

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