Gráficos com Python

#import cvs and matplotlib libary
import matplotlib.pyplot as plt
import csv

listax = []
listay = []

f = csv.reader(open('eggs.csv'), delimiter=',')
for x,y in f:
     listax.append(int(x))
     listay.append(float(y))

#plotando dados
plt.plot(listax, listay, linestyle="dashed", marker="o", color="green")

#configurando Eixo X
plt.xlim(0.5,4.5)
plt.xticks(listax)

#configurando Eixo Y
plt.ylim(19.8,21.2)
plt.yticks(listay)

#show plot
plt.show()