check if a value is nan pandas code example

Example 1: count nan pandas

#Python, pandas
#Count missing values for each column of the dataframe df

df.isnull().sum()

Example 2: check if a value in dataframe is nan

#return a subset of the dataframe where the column name value == NaN 
df.loc[df['column name'].isnull() == True]

Example 3: to detect if a data frame has nan values

> df.isnull().any().any()
True

Example 4: find nan values in a column pandas

df['your column name'].isnull().values.any()

Example 5: check if value is NaN

Number.isNaN(123)

Example 6: check if a value is nan pandas

import numpy as np
import pandas as pd

val = np.nan

print(pd.isnull(val))
# True