#!/usr/bin/python

import numpy as np
import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(111)

ax.bar(0.0, 69.0 , 0.1 , color='k')
ax.bar(0.0, -20.5 , 0.1 , color='w', hatch='///')

y_value_min = -20.5
if y_value_min % 10 != 0:
    yaxismin = y_value_min - (y_value_min % -10) - 10
else:
    yaxismin = y_value_min

print y_value_min
print yaxismin
plt.yticks(np.arange(yaxismin,101,10))

plt.tight_layout()
plt.show()