给定一组数据，使用Python代码计算均值、中位数和众数。
data = [1, 2, 2, 3, 4, 5, 5, 5, 6, 7, 8, 8, 9]
```python
import statistics

data = [1, 2, 2, 3, 4, 5, 5, 5, 6, 7, 8, 8, 9]

mean = statistics.mean(data)
median = statistics.median(data)
mode = statistics.mode(data)

print("The mean is:", mean)
print("The median is:", median)
print("The mode is:", mode)
```

输出结果：

```
The mean is: 5.0
The median is: 5
The mode is: 5
```