Honestly, I just use `pandas` for this.
```python
import pandas as pd
df = pd.json_normalize(data, sep='_')
print(df.filter(like='a').values.flatten())
```
Might be overkill, but it's handy if you're already using pandas.
```python
import pandas as pd
df = pd.json_normalize(data, sep='_')
print(df.filter(like='a').values.flatten())
```
Might be overkill, but it's handy if you're already using pandas.