python-pandasHow to count unique values in a dataframe

Usage example

import pandas as pd

data = pd.DataFrame({
  'Vendor': ['US', 'US', 'US', 'KR', 'KR'],
  'Phone': ['ip5', 'ip6', 'ip8', 'sms', 'xi'],
  'Phone Price': [204, 304, 204, 405, 204]
})

res = data['Phone Price'].nunique()
print(res)

output

3