python number of NaN values in each column code example
Example 1: count nan pandas
#Python, pandas
#Count missing values for each column of the dataframe df
df.isnull().sum()
Example 2: 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