python find out how many rows are missing from a specific column in dataframe code example

Example 1: count missing values by column in pandas

df.isna().sum()

Example 2: getting the number of missing values in pandas

cols_to_delete = df.columns[df.isnull().sum()/len(df) > .90]
df.drop(cols_to_delete, axis = 1, inplace = True)