Bug report

Bug summary

I have a script that loads some data, plots it, and then trains a machine learning model. When I manually try to close the figure window, the script continues, but the figure remains open until the script finishes execution.

Code for reproduction

import numpy as np
import matplotlib.pyplot as plt
import time

x = np.arange(5)
y = np.arange(5)

plt.plot(x, y)
plt.show()

time.sleep(30)

Actual outcome

When I try to close the figure window, it remains open until the entire script finishes execution.

Expected outcome

When I close the figure window, the figure should disappear immediately.

Matplotlib version

• Operating system: macOS 10.13.6 (High Sierra)
• Matplotlib version: 2.2.3 (conda)
• Matplotlib backend: MacOSX
• Python version: 3.6.5 (conda)