# Testa matplotlib.pyplot. Se https://matplotlib.org/3.1.0/tutorials/ 
import matplotlib.pyplot as plt

# Skapa en lista x=[0, 0.02, 0.04, 0.06, ...]
i=0
x=[i]
while i<=2:
   i+=0.02   
   x.append(i)

# Skapa 2 nya listor med kvadraterna och kuberna av x:
x_qud = [e*e for e in x]
x_cub = [e**3 for e in x]

# Matplotlib’s AXES-object manages the content that apperas in the
# window. Matplotlib’s FIGURE object manages the window in which
# the AXES appear.
fig, ax = plt.subplots() 
ax.grid()

plt.plot(x,x, 'm--', linewidth=7, label='linear')
plt.plot(x, x_qud, 'cs', label='quadratic') #color='c(yan)', marker=s(quare)
plt.plot(x, x_cub, 'y^', label='cubic') #color='y(ellow)', ls=^(triangle)
plt.axis([0,2,0,8])
plt.lable('HEJ')
plt.xlabel('x values')
plt.ylabel('y values')
plt.title("Simple Plot")
plt.legend() # Skriver ut labels i separat ruta
fig.savefig("7_1.png") # Spara bilden
plt.show()