If you want to implement your own version of the extend functionality without relying on the extend() method from Python's core library, you can create a custom function that achieves the same result. Here's an example:
```python
def custom_extend(list1, list2):
    for item in list2:
        list1.append(item)

# Example usage:
somelist = ['banana']
element = ['apple', 'orange']
custom_extend(somelist, element)
print(somelist)  # Output: ['banana', 'apple', 'orange']
```

In the custom_extend() function, we iterate over each item in list2 and use the append() method to add it to list1. This achieves the same behavior as the extend() method, where the elements of list2 are added individually to list1.

By using this custom function, you can extend a list without relying on the built-in extend() method.
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