Matplotlib exercises in Python

import matplotlib.pyplot as plt
import numpy as np


# Task 1: Import what you need from Matplotlib to plot out graphs
m = np.linspace(0,10,11)
c = 299792458
E = m * (c*c)

fig,axes = plt.subplots()
axes.plot(m, E, color = "red", linewidth = 4)
axes.set_xlabel('Mass in Grams')
axes.set_ylabel('Energy in Joules')
axes.set_title('E=mc^2')
axes.set_xlim(xmin = 0, xmax = 10)

# How to plot logarithmic scale on y axis
axes.set_yscale('log')

# How to set a grid on y axis
axes.yaxis.grid(True, which='minor')


# Task 2: Figure out how to plot both curves on the same Figure
labels = ['1 Mo','3 Mo','6 Mo','1 Yr','2 Yr','3 Yr','5 Yr','7 Yr','10 Yr','20 Yr','30 Yr']
july16_2007 =[4.75,4.98,5.08,5.01,4.89,4.89,4.95,4.99,5.05,5.21,5.14]
july16_2020 = [0.12,0.11,0.13,0.14,0.16,0.17,0.28,0.46,0.62,1.09,1.31]

fig = plt.figure(figsize = (5,4),dpi=400)
axes1 = fig.add_axes([0,0,1,1])

axes1.plot(labels, july16_2007, label = 'july16_2007') # for first curve
axes1.set_ylim(ymin = 0, ymax = 5.5)

axes1.plot(labels, july16_2020,  label = 'july16_2020') # for second curve
axes1.legend(loc = [1.05, 0.5]) # the legend is set out of the plot


# Task 3: Create two different plots
fig1,axes2 = plt.subplots(nrows=2, ncols = 1, dpi = 200, figsize = (10,6))
axes2[0].plot(labels,july16_2007)
axes2[0].set_xlabel('july16_2007', loc = 'center')
axes2[1].plot(labels,july16_2020)
axes2[1].set_xlabel('july16_2020', loc = 'center')

fig1.tight_layout()


# Task 4: How to add two y axis and changed their color
x = labels
y1 = july16_2007
y2 = july16_2020

fig, ax1 = plt.subplots()
ax2 = ax1.twinx()

ax1.plot(x, y1, color = 'blue')
ax2.plot(x, y2, color = 'red')

ax1.set_ylabel('2007', color='blue')
ax2.set_ylabel('2020', color='red')

ax2.spines['left'].set_color('blue')
ax2.spines['right'].set_color('red')