brettpetch

import pandas as pd  # Use pandas instead to map the data easily
import matplotlib.pyplot as plt  # Use Matplotlib PyPlot to create graph
import numpy as np  # Use Numpy to take mean


def all_temp_plot(filename="London_mean_etr_max_etr_min.csv"):
    # Note: This will not drop years with incomplete datsets.
    # Read CSV, but only 3 columns because no one cares about the other ones
    # then group years, then take mean of months and append it to a new column in a new dataframe.
    df = pd.read_csv(filename, delimiter=',', usecols=[0, 1, 2],