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Version 2.2.2
matplotlib
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matplotlib.pyplot.draw

matplotlib.pyplot.draw()

Redraw the current figure.

This is used to update a figure that has been altered, but not automatically re-drawn. If interactive mode is on (ion()), this should be only rarely needed, but there may be ways to modify the state of a figure without marking it as stale. Please report these cases as bugs.

A more object-oriented alternative, given any Figure instance, fig, that was created using a pyplot function, is:

fig.canvas.draw_idle()