python-pandasHow to count dataframe NaN rows

Usage example

import pandas as pd

data = pd.DataFrame({
  'Vendor': ['US', 'US', None, 'KR', None],
  'Phone': ['ip5', 'ip6', 'ip8', 'sms', 'xi'],
  'Phone Price': [204, 304, 404, 405, 305]
})

res = len(data[data['Vendor'].isna()])
print(res)

output

2