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import matplotlib.pyplot as plt

import numpy as np # linear algebra

import pandas as pd # data processing, CSV file I/O (e.g. pd.read_csv)

import seaborn as sns

df = pd.read_csv('../input/world-population-dataset/world_population.csv')

df.shape

df.isnull().sum()

df.notnull()

df.dropna()

df.fillna

df = np.random.rand(10, 12)
ax = sns.heatmap(df)