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Python – Extract Tuples with all Numeric Strings
• Last Updated : 02 Sep, 2020

Given a list of tuples, extract only those tuples which have all numeric strings.

Input : test_list = [(“45”, “86”), (“Gfg”, “1”), (“98”, “10”)]
Output : [(’45’, ’86’), (’98’, ’10’)]
Explanation : Only number representating tuples filtered.

Input : test_list = [(“Gfg”, “1”)]
Output : []
Explanation : No tuple containing just numbers.

Method #1 : Using list comprehension + all() + isdigit()

In this, we check for string being numeric string using isdigit() and all() is used to check for all strings. List comprehension is used to iterate all tuples.

## Python3

 `# Python3 code to demonstrate working of ``# Extract Tuples with all Numeric Strings``# Using all() + list comprehension + isdigit()`` ` `# initializing list``test_list ``=` `[(``"45"``, ``"86"``), (``"Gfg"``, ``"1"``), (``"98"``, ``"10"``), (``"Gfg"``, ``"Best"``)]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# all() checks for all digits()``res ``=` `[sub ``for` `sub ``in` `test_list ``if` `all``(ele.isdigit() ``for` `ele ``in` `sub)]`` ` `# printing result ``print``(``"Filtered Tuples : "` `+` `str``(res))`
Output
```The original list is : [('45', '86'), ('Gfg', '1'), ('98', '10'), ('Gfg', 'Best')]
Filtered Tuples : [('45', '86'), ('98', '10')]
```

Method #2 : Using lambda + filter() + isdigit()

In this, we perform task of filtering using filter() + lambda, and isdigit() is used to check for numerics.

## Python3

 `# Python3 code to demonstrate working of ``# Extract Tuples with all Numeric Strings``# Using lambda + filter() + isdigit()`` ` `# initializing list``test_list ``=` `[(``"45"``, ``"86"``), (``"Gfg"``, ``"1"``), (``"98"``, ``"10"``), (``"Gfg"``, ``"Best"``)]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# all() checks for all digits()``res ``=` `list``(``filter``(``lambda` `sub : ``all``(ele.isdigit() ``for` `ele ``in` `sub), test_list))`` ` `# printing result ``print``(``"Filtered Tuples : "` `+` `str``(res))`
Output
```The original list is : [('45', '86'), ('Gfg', '1'), ('98', '10'), ('Gfg', 'Best')]
Filtered Tuples : [('45', '86'), ('98', '10')]
```

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