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Check Single Distinct Element

Write a Python function to check whether a list of numbers contains only one distinct element or not.


```python [main.nopy]
unique_element([1, 1, 1])  # Returns: True
unique_element([1, 2, 1, 2])  # Returns: False
unique_element([1, 2, 3, 4, 5])  # Returns: False
```
def unique_element(arr):
    """
    Check if the list contains only one distinct element.

    Args:
        arr (list): A list of numbers.

    Returns:
        bool: True if the list contains only one distinct element, False otherwise.
    """
    # Your code here
    pass
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