import pandas as pd
from io import StringIO

csv_data = \
    '''A,B,C,D
    1.0,2.0,3.0,4.0
    5.0,6.0,,8.0
    10.0,11.0,12.0,'''

df = pd.read_csv(StringIO(csv_data))

print(df.isnull().sum())
print('test')
