How to use the mplcursors.HoverMode.Persistent function in mplcursors
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anntzer / mplcursors / tests / test_mplcursors.py View on Github 
"hover", [True, HoverMode.Persistent, 2, HoverMode.Transient])
def test_hover(ax, hover):
l1, = ax.plot([0, 1])
l2, = ax.plot([1, 2])
cursor = mplcursors.cursor(hover=hover)
_process_event("motion_notify_event", ax, (.5, .5), 1)
assert len(cursor.selections) == 0 # No trigger if mouse button pressed.
_process_event("motion_notify_event", ax, (.5, .5))
assert cursor.selections[0].artist == l1
_process_event("motion_notify_event", ax, (.5, 1))
assert bool(cursor.selections) == (hover == HoverMode.Persistent)
_process_event("motion_notify_event", ax, (.5, 1.5))
assert cursor.selections[0].artist == l2mplcursors
Interactive data selection cursors for Matplotlib.
