Pyplot lines example

matplotlib_backend.py

import matplotlib
gui_env = ['Qt4Agg','WXAgg', 'TKAgg','GTKAgg']
for gui in gui_env:
    try:
        print("testing", gui)
        matplotlib.use(gui,warn=False, force=True)
        from matplotlib import pyplot as plt
        break
    except:
        continue
print("Using:",matplotlib.get_backend())

y.py

import matplotlib.pyplot as plt
import numpy as np

n = 10
for pos in np.linspace(-n, 2*n, 3*n+1):
    plt.vlines(pos, 0, n)
    plt.hlines(pos, 0, n)
for pos in np.linspace(-n, 2*n, 3*n*10+1):
    plt.axline((pos, 0), slope=1, color='k', transform=plt.gca().transAxes)
    plt.axline((pos, 0), slope=-1, color='k', transform=plt.gca().transAxes)

plt.ylim([0, n])
plt.xlim([0, n])
plt.show()