So as part of a book I'm working through I'm trying to plot weather data using two different csv files and have implemented a function to do so.

import csv
from matplotlib import pyplot as plt

def get_high(filename, highs):
    with open(filename) as f:
        reader = csv.reader(f)
        header_row = next(reader)

        for row in reader:
            high = int(row[4])
            highs.append(high)

highs = []
get_high('report1.csv', highs)
fig = plt.figure(dpi=128, figsize=(15,9))
plt.plot(highs, c='red')

highs = []
get_high('report2.csv', highs)

plt.plot(highs, c='blue')

plt.title("January Tempatures in Miami 2020(red) vs 1970(blue)", fontsize=20)
plt.xlabel("Days", fontsize=10)
plt.ylabel('Tempatures (F)', fontsize=10)
plt.tick_params(axis='both', major='which', labelsize=16)
plt.show()

When I run this it gives me "high = int(row[4]) IndexError: list index out of range".

I've tried going back and changing 4. At 0 and 1 it tells me "ValueError: invalid literal for int() with base 10:" And as soon as I hit the 2nd index (where the integers start) it gives me the IndexError. I noticed when I hover over header_row it tells me that it can't be accessed and I think that's what's causing this problem but I can't find a fix for it.

EDIT; Also looking for a way to make it so the graph DOESN'T start mapping at 0.