Bug summary

I can't draw anything. it trays to open something but it closes immediately.

Code for reproduction

import matplotlib.pyplot as plt
import numpy as np

x = np.arange(0, 5, 0.1)
y = np.sin(x)
plt.plot(x, y)

Actual outcome

It doesn't print something in console. it just doesn't opens

Expected outcome

Open Plot figure

Matplot version: 1.5.3
Python version: 2.7
OS: MacOS

I installed it with pip

$ pip install matplotlib

Thanks !