Answers for "how to find nans count for col in pandas"

find the number of nan per column pandas

In [1]: s = pd.Series([1,2,3, np.nan, np.nan])

In [4]: s.isna().sum()   # or s.isnull().sum() for older pandas versions
Out[4]: 2

knowing the sum null values in a specific row in pandas dataframe

note:df is syour dataframe 

print(df['emp_title'].isnull().sum())