请用字典推导式Python写一段查询害内容是否在已有字典里面的运行输出代码

```python
def check_key_in_dict(dictionary, key):
return key in dictionary

my_dict = {'a': 1, 'b': 2, 'c': 3}
key_to_check = 'a'
result = check_key_in_dict(my_dict, key_to_check)
print(result)
```