Matplotlib 的 NetworkX 错误

Question

我最近重新安装了 matplotlib，我注意到我几个月前编写的代码（功能齐全）使用 networkx 生成图形输出，现在在控制台上输出错误.我得到的错误详述如下。

C:\Python36\lib\site-packages\networkx\drawing\nx_pylab.py:126: MatplotlibDeprecationWarning: pyplot.hold is deprecated.
Future behavior will be consistent with the long-time default:
plot commands add elements without first clearing the
Axes and/or Figure.
b = plt.ishold()
C:\Python36\lib\site-packages\networkx\drawing\nx_pylab.py:138: MatplotlibDeprecationWarning: pyplot.hold is deprecated.
Future behavior will be consistent with the long-time default:
plot commands add elements without first clearing the
Axes and/or Figure.
plt.hold(b)
C:\Python36\lib\site-packages\matplotlib\__init__.py:917: UserWarning: axes.hold is deprecated. Please remove it from your matplotlibrc and/or style files.
warnings.warn(self.msg_depr_set % key)
C:\Python36\lib\site-packages\matplotlib\rcsetup.py:152: UserWarning: axes.hold is deprecated, will be removed in 3.0
warnings.warn("axes.hold is deprecated, will be removed in 3.0")
Traceback (most recent call last):
File "C:\Users\lukec\Dropbox\University\Year 2 Semester 2\ICS2210 Data Structures and Algorithms II\Assignment\launcher.py", line 33, in <module>
graph.draw()
File "C:\Users\lukec\Dropbox\University\Year 2 Semester 2\ICS2210 Data Structures and Algorithms II\Assignment\graph.py", line 122, in draw
nx.drawing.nx_pydot.write_dot(G, "graph.dot")   
File "<decorator-gen-232>", line 2, in write_dot
File "C:\Python36\lib\site-packages\networkx\utils\decorators.py", line 220, in _open_file
result = func(*new_args, **kwargs)
File "C:\Python36\lib\site-packages\networkx\drawing\nx_pydot.py", line 43, in write_dot
P=to_pydot(G)
File "C:\Python36\lib\site-packages\networkx\drawing\nx_pydot.py", line 175, in to_pydot
import pydotplus
ModuleNotFoundError: No module named 'pydotplus'

程序仍然可以正常运行，但是，我得到了正确的计算和图形输出，就像以前一样，唯一的区别是 matplotlib 的外观不同：

我的问题是：

Could this be due to the fact that matplotlib has recently been updated, and networkx seems to be using things from it which are outdated? (Matplotlib was updated last month I believe). Could it be from my code? Is there anything I can do to prevent these errors?

感谢任何帮助。

Answer 1

matlplotlib 的最新发布日期是 2017 年 2 月 20 日。

networkx 的最新发布日期是 2017 年 1 月 11 日

除了 pydotplus 消息之外，您收到的所有消息似乎都是警告，在不久的将来某些当前命令将无法使用（并提供有关如何正确访问这些未来命令的说明现在）。我不知道 pydotplus。我认为这与 matplotlib 无关。

是的，这是因为更新。这应该不是问题，但也许下一个版本的 networkx 需要使用新的 matplotlib。

我相信您会在这个问题中找到消除这些警告的说明：

Matplotlib 的 NetworkX 错误

NetworkX Bug with Matplotlib

python

matplotlib

networkx