how to calculate unique values of a dataframe code example
Example 1: unique values in dataframe column count
df.groupby('mID').agg(['count', 'size', 'nunique']).stack()
dID hID uID
mID
A count 5 5 5
size 5 5 5
nunique 3 5 5
B count 2 2 2
size 2 2 2
nunique 2 2 2
C count 1 1 1
size 1 1 1
nunique 1 1 1
Example 2: values of unique from dataframe with count
data = df.groupby('ColumnName')['IDColumnName'].nunique()
print(data)