pyplot导入引发了一场恐慌

Question

我有一个奇怪的问题尝试导入matplotlib。每当我做导入的时候

导入matplotlib.pyplot

我收到以下错误消息（仅导入matplotlib时没有错误：

Vendor:  Continuum Analytics, Inc.
Package: mkl
Message: trial mode expires in 30 days
Traceback (most recent call last):
  File "C:\Users\Pierre\Anaconda3\lib\site-packages\matplotlib\backends\qt_compat.py", line 159, in <module>
    from PySide import QtCore, QtGui, __version__, __version_info__
ImportError: No module named 'PySide'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:/Users/Pierre/Dropbox/piR/Coding/Python/Eigene Projekte/GPX_reader/main.py", line 6, in <module>
    import matplotlib.pyplot as plt
  File "C:\Users\Pierre\Anaconda3\lib\site-packages\matplotlib\pyplot.py", line 114, in <module>
    _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
  File "C:\Users\Pierre\Anaconda3\lib\site-packages\matplotlib\backends\__init__.py", line 32, in pylab_setup
    globals(),locals(),[backend_name],0)
  File "C:\Users\Pierre\Anaconda3\lib\site-packages\matplotlib\backends\backend_qt4agg.py", line 18, in <module>
    from .backend_qt5agg import FigureCanvasQTAggBase as _FigureCanvasQTAggBase
  File "C:\Users\Pierre\Anaconda3\lib\site-packages\matplotlib\backends\backend_qt5agg.py", line 15, in <module>
    from .backend_qt5 import QtCore
  File "C:\Users\Pierre\Anaconda3\lib\site-packages\matplotlib\backends\backend_qt5.py", line 31, in <module>
    from .qt_compat import QtCore, QtGui, QtWidgets, _getSaveFileName, __version__
  File "C:\Users\Pierre\Anaconda3\lib\site-packages\matplotlib\backends\qt_compat.py", line 162, in <module>
    "Matplotlib qt-based backends require an external PyQt4, PyQt5,\n"
ImportError: Matplotlib qt-based backends require an external PyQt4, PyQt5,
or PySide package to be installed, but it was not found.

我在Windows 10的Anaconda发行版中使用Python 3.5。有人遇到同样的问题吗？我的设置中最近唯一的变化是（强制）升级到Windows 10...

谢谢并致以最良好的祝愿

皮埃尔

Answer 1

您没有安装PySide或PyQt，错误消息很清楚，因为matplotlib依赖于其中任何一个

要安装PySide run

pip install -U PySide

在命令行中，-U代表升级，意味着将您安装的所有软件包升级到最新版本

从pip的手册页

-U, --upgrade
              Upgrade all packages to  the  newest  available  version.   This
              process  is  recursive  regardless  of  whether  a dependency is
              already satisfied.

但你应该做得很好

pip install PySide

如果出于某种原因，您不想升级pip安装的其他软件包