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import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import seaborn as sns

df = pd.read_csv("C:\\Users\\Avinash\\Documents\\jovian\\petrol.csv")
df
mean_df = df.mean()
mean_df
Delhi      68.582299
Kolkata    71.781872
Mumbai     76.686176
Chennai    70.895348
dtype: float64
 

Year Wise Analysis

def return_corresponding_year_df(year):
    return df[df["Date"].str.contains(year)]