在Python中编写一个计算一组数字平均值的程序。
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
以下是Python代码：

```python
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
average = sum(numbers) / len(numbers)
print("The average is: ", average)
```

输出：

```
The average is: 5.5
```