生成一个5行7列的随机数字矩阵并将其输出。
以下是生成一个5行7列的随机数字矩阵的Python代码：

```python
import random

matrix = [[random.randint(0, 9) for j in range(7)] for i in range(5)]

for row in matrix:
    print(row)
```

输出结果可能如下所示（每次运行结果不同）：

```
[1, 7, 8, 2, 1, 5, 6]
[8, 3, 3, 9, 7, 8, 3]
[1, 0, 7, 0, 8, 3, 9]
[0, 2, 8, 7, 1, 5, 7]
[8, 8, 9, 9, 1, 6, 8]
```