A nested list can be flattened using recursion or list comprehensions.

1. Using Recursion:
   • A function that checks each element and processes it accordingly.
2. Code Example:
   
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   def flatten_list(nested_list):
       result = []
       for element in nested_list:
           if isinstance(element, list):
               result.extend(flatten_list(element))
           else:
               result.append(element)
       return result
   
   my_list = [1, [2, [3, 4], 5], 6]
   print(flatten_list(my_list))  # Output: [1, 2, 3, 4, 5, 6]
   

   
   
3. Using List Comprehensions:
   • A more concise approach.
4. Alternative Code:
   
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   def flatten_list(nested_list):
       return [element for sublist in nested_list for element in (flatten_list(sublist) if isinstance(sublist, list) else [sublist])]
   
   my_list = [1, [2, [3, 4], 5], 6]
   print(flatten_list(my_list))  # Output: [1, 2, 3, 4, 5, 6]
   

   
   
5. Explanation:
   • Both methods effectively handle nested structures of arbitrary depth.
   • The recursive approach is intuitive and easy to read.