count missing values in dataframe python code example

Example 1: number of columns with no missing values

null_cols = df.columns[df.isnull().all()]
df.drop(null_cols, axis = 1, inplace = True)

Example 2: pandas count number missing values

dfObj.isnull().sum()

Example 3: pandas count number missing values

dfObj.isnull().sum().sum()