how to check missing values in dataframe code example

Example 1: count missing values by column in pandas

df.isna().sum()

Example 2: represent NaN with pandas in python

import pandas as pd

if pd.isnull(float("Nan")):
  print("Null Value.")

Example 3: 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)