how to count all the null the null values in each column of a datframe in python code example

Example 1: python count null values in dataframe

# Count total missing values in a dataframe

df.isnull().sum().sum()

# Gives a integer value

Example 2: number of columns with no missing values

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

Example 3: number of columns with no missing values

df = df[df.columns[~df.isnull().all()]]