Fix Python – Counting unique values in a column in pandas dataframe like in Qlik?

If I have a table like this:
df = pd.DataFrame({
‘hID’: [101, 102, 103, 101, 102, 104, 105, 101],
‘dID’: [10, 11, 12, 10, 11, 10, 12, 10],
‘uID’: [‘James’, ‘Henry’, ‘Abe’, ‘James’, ‘Henry’, ‘Brian’, ‘Claude’, ‘James’],
‘mID’: [‘A’, ‘B’, ‘A’, ‘B’, ‘A’, ‘A’, ‘A’, ‘C’]
})

I can do count(distinct hID) in Qlik to ….