回答此问题可获得 20 贡献值,回答如果被采纳可获得 50 分。
<p>尝试运行这段源于matplotlib文档<a href="https://matplotlib.org/gallery/images_contours_and_fields/image_transparency_blend.html#sphx-glr-gallery-images-contours-and-fields-image-transparency-blend-py" rel="nofollow noreferrer">Blend transparency with color in 2-D images</a>的代码时:</p>
<pre><code>import numpy as np
import matplotlib.pyplot as plt
test = np.random.random((300, 300))
plt.figure()
plt.imshow(test, alpha = test/test.max())
plt.show()
</code></pre>
<p>我的结局是:</p>
<pre><code><matplotlib.image.AxesImage at 0x7f8bfe8cc610>Traceback (most recent call last):
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/backends/backend_qt5.py", line 508, in _draw_idle
self.draw()
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/backends/backend_agg.py", line 388, in draw
self.figure.draw(self.renderer)
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/artist.py", line 38, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/figure.py", line 1709, in draw
renderer, self, artists, self.suppressComposite)
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/image.py", line 135, in _draw_list_compositing_images
a.draw(renderer)
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/artist.py", line 38, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/axes/_base.py", line 2647, in draw
mimage._draw_list_compositing_images(renderer, self, artists)
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/image.py", line 135, in _draw_list_compositing_images
a.draw(renderer)
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/artist.py", line 38, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/image.py", line 619, in draw
renderer, renderer.get_image_magnification())
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/image.py", line 881, in make_image
unsampled=unsampled)
File "/Users/darkvador/opt/anaconda3/lib/python3.7/site-packages/matplotlib/image.py", line 530, in _make_image
np.asarray(alpha_channel, np.float32) * out_alpha * alpha,
ValueError: operands could not be broadcast together with shapes (740,740) (300,300)
</code></pre>
<p>我在macos catalina手下,与python合作:</p>
<pre><code>Python 3.7.7 (default, Mar 26 2020, 10:32:53)
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
</code></pre>
<p>请注意,如果出现以下情况,则不会发生错误:</p>
<ul>
<li>我评论<code>plt.show()</code></li>
<li>我使用一个常量<code>alpha</code>-value</li>
<li>我在linux发行版的经典python 3.6下运行这段代码</li>
</ul>