# pyhton2 - python3 compatibility
from __future__ import division
from __future__ import absolute_import
from __future__ import print_function
from __future__ import unicode_literals
#
import numpy as np
import matplotlib.pyplot as plt

ym=[2.31,1.27,4.40,4.98,5.40,6.98,7.53,8.54,9.65,10.15]
xm=range(1,11)
plt.errorbar(xm,ym,yerr=0.5,fmt='ro')
plt.xlabel('x')
plt.ylabel('y')
x=np.linspace(0.,11.,100)
y=x+0.5
plt.plot(x,y)
plt.show()