count unique values column pandas code example
Example 1: pandas unique values in column
#List unique values in the df['name'] column
df.name.unique()
Example 2: pandas count the number of unique values in a column
df['hID'].nunique()
5
Example 3: 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 4: count unique pandas
df.nunique()