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import os
import numpy as np 
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
df=pd.read_csv("drug200.csv", sep=",")
df.head()
df.groupby(['BP'])[['Age']].count()
df.isna().sum()
Age            0
Sex            0
BP             0
Cholesterol    0
Na_to_K        0
Drug           0
dtype: int64