How to filter lines if column is without variable name - Python

Question

I have some excel data that I imported into a Python dataframe (Base_Eventos). I need to summarize a variable (idPartida), then use:

Base_Eventos.groupby (by = 'idPartida '). count()

Only the result comes out with the counter column without a variable name. And I’ll need to use that count output to make a filter. base ex:

The second column is empty (variable name). Is it possible to add a name? Or there’s another way to filter without adding a name. 'Cause I want to select the idPartida with more than 1000 events.