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Ran 24 Jul 2016 08:15PM UTC

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Committed 24 Jul 2016 07:57PM UTC coverage: 70.345% (-0.004%) from 70.349%

Job # PANDAS=pandas NOSE_ARGS=--with-coverage

Build Type

Pull #6821

travis-ci

Committed by

web-flow

Commit Message

Break reference cycle Line2D <-> Line2D._lineFunc.

Upon drawing, Line2D objects would store a reference to one of their own
bound methods as their `_lineFunc` argument.  This would lead to them
being gc'ed not when going out of scope, but only when the "true" gc
kicks in; additionally this led to some pickle-related bugs (#3627).

One can easily sidestep this problem by not storing this bound method.

To check the behavior, try (py3.4+ only):

```
import gc
import weakref
from matplotlib import pyplot as plt

def f():
    fig, ax = plt.subplots()
    img = ax.imshow([[0, 1], [2, 3]])
    weakref.finalize(img, print, "gc'ing image")
    l, = plt.plot([0, 1])
    weakref.finalize(l, print, "gc'ing line")
    fig.canvas.draw()
    img.remove()
    l.remove()

f()
print("we have left the function")
gc.collect()
print("and cleaned up our mess")
```

Before the patch, the AxesImage is gc'ed when the function exits but the
Line2D only upon explicit garbage collection.  After the patch, both are
collected immediately.

Pull Request Pull Request #6821: Break reference cycle Line2D <-> Line2D._lineFunc.

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