Bug report

Bug summary

When using PyQt5, QFontMetrics is not available in matplotlib.backends.qt_compat.QtWidgets. Originally reported in matplotlib/viscm#23

Code for reproduction

from matplotlib.backends.qt_compat import QtWidgets
QtWidgets.QFontMetrics

Actual outcome

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-3-6ef96c02dc84> in <module>()
----> 1 QtWidgets.QFontMetrics

AttributeError: module 'PyQt5.QtWidgets' has no attribute 'QFontMetrics'

Expected outcome

PyQt5.QtGui.QFontMetrics

Software versions

ubuntu xenial
matplottib: 2.0.0 (also verified on 1.5.3), installed via pip
PyQt5: 5.5.1+dfsg-3ubuntu4