It doesn't apply in descending order.

Dictionaries don't have an order.

If you want to sort, you can change it to a list, but if you wrote a dictionary for the purpose of counting, what's better is the collections counter.

But then again, the ID to count seems to be a column in the data frame. It is best to write value_counts.

id_ounter = df["ID"].value_counts()

Sort and escalating factors can determine whether to sort or not and the direction of sorting.

https://pandas.pydata.org/docs/reference/api/pandas.Series.value_counts.html#