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# Python – Type conversion in Nested and Mixed List

• Last Updated : 08 Jun, 2020

While working with Python lists, due to its heterogenous nature, we can have a problem in which we need to convert data type of each nested element of list to particular type. In mixed list, this becomes complex. Let’s discuss certain way in which this task can be performed.

Input : test_list = [(‘7’, [‘8’, (‘5’, )])]
Output : [(7, [8, (5, )])]

Input : test_list = [‘6’]
Output : [6]

Method : Using recursion + `isinstance()`
The combination of above functions can be used to solve this problem. In this, we use isinstance() to get the data type of element of list, and if its container, the inner elements are recursed to perform conversion.

 `# Python3 code to demonstrate working of ``# Type conversion in Nested and Mixed List``# Using recursion + isinstance()`` ` `# helper_fnc``def` `change_type(sub):``    ``if` `isinstance``(sub, ``list``):``        ``return` `[change_type(ele) ``for` `ele ``in` `sub]``    ``elif` `isinstance``(sub, ``tuple``):``        ``return` `tuple``(change_type(ele) ``for` `ele ``in` `sub)``    ``else``:``        ``return` `int``(sub)``         ` `# initializing list``test_list ``=` `[``'6'``, ``'89'``, (``'7'``, [``'8'``, ``'10'``]), [``'11'``, ``'15'``]]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# Type conversion in Nested and Mixed List``# Using recursion + isinstance()``res ``=` `change_type(test_list)`` ` `# printing result ``print``(``"Data after type conversion : "` `+` `str``(res)) `
Output :
```The original list is : ['6', '89', ('7', ['8', '10']), ['11', '15']]
Data after type conversion : [6, 89, (7, [8, 10]), [11, 15]]
```

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