[Python] Counting number of separate events in dataframe

I am trying to count the number of separate events in a Dataframe (not number of occurences)

Let's say i have this dataframe :

df = pd.DataFrame([1, 2, 2, 2, 1, 1, 1, 1, 2, 1], columns=["events"])


And i want to count the number of separate events. If i use

df.value_counts()


It' going to give me the number of occurences of each event : events

1 6
2 4
Name: count, dtype: int64.


But i want to count the number of separate events regardless of their lenght. The result should be something like this :

events
1 3
2 2


I wanted to know if there is a built in function for this. Any help or advice would be greatly appreciated. Thank you

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