Question

我运行以下代码，用matplotlib面向对象的API绘制单行。

$ ipython --pylab
In [1]: fig = plt.figure() # An empty figure is shown in popped up window here
In [2]: ax = fig.add_subplot(1,1,1)
In [3]: ax.plot(arange(10)) # no figure is shown up here
Out[3]: [<matplotlib.lines.Line2D at 0x7fb134118400>]
In [4]: fig.show()

执行fig = plt.figure()时，会弹出一个新窗口并显示一个空图。在按ax.plot(arange(10))绘图后，没有自动显示数字，因此我尝试按fig.show()显示该数字，我收到此错误。

AttributeError                            Traceback (most recent call last)
<ipython-input-6-6ebedab27258> in <module>()
----> 1 fig.show()

~/.pyenv/versions/3.6.4/envs/analysis/lib/python3.6/site-packages/matplotlib/figure.py in show(self, warn)
    409         if manager is not None:
    410             try:
--> 411                 manager.show()
    412                 return
    413             except NonGuiException:

~/.pyenv/versions/3.6.4/envs/analysis/lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py in show(self)
    560             self.canvas.draw_idle()
    561         # Raise the new window.
--> 562         self.canvas.manager.window.attributes('-topmost', 1)
    563         self.canvas.manager.window.attributes('-topmost', 0)
    564         self._shown = True

AttributeError: 'NoneType' object has no attribute 'attributes'

但像这样丑陋的单行正确地显示折线图。

plt.figure().add_subplot(1,1,1).plot(arange(10))

好像IPython shell多次无法显示相同的数字。我该如何避免这种行为？

Answer 1

问题是我如何用空图处理窗户。我总是在执行fig = plt.figure()后立即关闭它。我不应该这样做。保持打开允许ax.plot()在打开的数字上绘制线条。

如何在IPython shell中多次显示相同的matplotlib图？

1 个答案: