Answers for "how to check not nan in pandas"

count nan pandas

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

df.isnull().sum()

find nan value in dataframe python

# to mark NaN column as True
df['your column name'].isnull()

check if a value is nan pandas

import numpy as np
import pandas as pd

val = np.nan

print(pd.isnull(val))
# True