count unique values in dataframe column code example

Example 1: pandas count the number of unique values in a column

df['hID'].nunique()
5

Example 2: values of unique from dataframe with count

data = df.groupby('ColumnName')['IDColumnName'].nunique()
print(data)

Example 3: how to count unique values in a column dataframe in python

dataframe.column.nunique()