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Python – Filter String Tuples if String lengths equals K
• Last Updated : 02 Sep, 2020

Given List of tuples, filter tuples, whose element strings have length equal to K.

Input : test_list = [(“ABC”, “Gfg”, “CS1”), (“Gfg”, “Best”), (“Gfg”, “WoOW”)], K = 3
Output : [(‘ABC’, ‘Gfg’, ‘CS1’)]
Explanation : All Strings have length 3 in above tuple.

Input : test_list = [(“ABCD”, “Gfg”, “CS1”), (“Gfg”, “Best”), (“Gfg”, “WoOW”)], K = 3
Output : []
Explanation : No Strings have length 3 in above tuples.

Method #1 : Using loop

In this, we run nested loop to test each string, if equals to K, then the tuple is appended to result list, else its omitted.

## Python3

 `# Python3 code to demonstrate working of ``# Filter String Tuples if String lengths equals K``# Using loop`` ` `# initializing list``test_list ``=` `[(``"ABC"``, ``"Gfg"``, ``"CS1"``), (``"Gfg"``, ``"Best"``), (``"Gfg"``, ``"WoW"``)]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initializing K ``K ``=` `3`` ` `res_list ``=` `[]``for` `sub ``in` `test_list:``    ``res ``=` `True` `    ``for` `ele ``in` `sub:``         ` `        ``# check using len() the lengths``        ``if` `len``(ele) !``=` `K :``            ``res ``=` `False` `            ``break``    ``if` `res:``        ``res_list.append(sub)`` ` `# printing result ``print``(``"The filtered tuples : "` `+` `str``(res_list))`
Output
```The original list is : [('ABC', 'Gfg', 'CS1'), ('Gfg', 'Best'), ('Gfg', 'WoW')]
The filtered tuples : [('ABC', 'Gfg', 'CS1'), ('Gfg', 'WoW')]
```

Method #2 : Using all() + list comprehension

Compacted way, uses all() to check for lengths equivalence and iteration using list comprehension.

## Python3

 `# Python3 code to demonstrate working of ``# Filter String Tuples if String lengths equals K``# Using all() + list comprehension`` ` `# initializing list``test_list ``=` `[(``"ABC"``, ``"Gfg"``, ``"CS1"``), (``"Gfg"``, ``"Best"``), (``"Gfg"``, ``"WoW"``)]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initializing K ``K ``=` `3`` ` `# all checks for all lengths equals K ``res ``=` `[sub ``for` `sub ``in` `test_list ``if` `all``(``len``(ele) ``=``=` `K ``for` `ele ``in` `sub)]`` ` `# printing result ``print``(``"The filtered tuples : "` `+` `str``(res))`
Output
```The original list is : [('ABC', 'Gfg', 'CS1'), ('Gfg', 'Best'), ('Gfg', 'WoW')]
The filtered tuples : [('ABC', 'Gfg', 'CS1'), ('Gfg', 'WoW')]
```

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