python-pandasHow to aggregate (groupby) dataframe using count

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, 404, 405, 305]
})

res = data.groupby(['Vendor']).count()
print(res)

output

        Phone  Phone Price
Vendor                    
KR          2            2
US          3            3