我一直在使用 matplotlib 一段时间没有问题。自从我需要交互式绘图功能（使用了 Tkaag）以来已经有一段时间了。从那以后我更新了 matplotlib 几次。
我今天尝试使用它，但它产生了一个错误。
/usr/local/lib/python2.7/dist-packages/matplotlib/backends/tkagg.py in <module>()
----> 1 import _tkagg
2 import Tkinter as Tk
3
4 def blit(photoimage, aggimage, bbox=None, colormode=1):
5 tk = photoimage.tk
ImportError: No module named _tkagg
我尝试了一个不同的后端，添加了
backend : GTKAgg
到 matplotlibrc。只是为了获得不同模块的相同错误。
ImportError: No module named _backend_gdk
当我在 /usr/local/lib/python2.7/dist-packages/matplotlib/backends/ 中浏览后端时，我注意到所有带下划线的必需模块都丢失了。
alan@linux /usr/local/lib/python2.7/dist-packages/matplotlib/backends $ ls
backend_agg.py backend_macosx.py backend_template.pyc
backend_agg.pyc backend_macosx.pyc backend_tkagg.py
_backend_agg.so backend_mixed.py backend_tkagg.pyc
backend_cairo.py backend_mixed.pyc backend_wxagg.py
backend_cairo.pyc backend_pdf.py backend_wxagg.pyc
backend_cocoaagg.py backend_pdf.pyc backend_wx.py
backend_cocoaagg.pyc backend_ps.py backend_wx.pyc
backend_emf.py backend_ps.pyc __init__.py
backend_emf.pyc backend_qt4agg.py __init__.pyc
backend_fltkagg.py backend_qt4agg.pyc Matplotlib.nib
backend_fltkagg.pyc backend_qt4.py qt4_compat.py
backend_gdk.py backend_qt4.pyc qt4_compat.pyc
backend_gdk.pyc backend_qtagg.py qt4_editor
backend_gtkagg.py backend_qtagg.pyc tkagg.py
backend_gtkagg.pyc backend_qt.py tkagg.pyc
backend_gtkcairo.py backend_qt.pyc windowing.py
backend_gtkcairo.pyc backend_svg.py windowing.pyc
backend_gtk.py backend_svg.pyc
backend_gtk.pyc backend_template.py
我当前的 matplotlib 版本：
matplotlib - 1.1.1 - active development (/usr/local/lib/python2.7/dist-packages)
我试过卸载并重新安装matplotlib：
pip uninstall matplotlib
pip install matplotlib
一切顺利。
关于设置让交互式绘图再次运行的提示？
BUILDING MATPLOTLIB
matplotlib: 1.1.1
python: 2.7.3rc2 (default, Apr 22 2012, 22:35:38) [GCC
4.6.3]
platform: linux2
REQUIRED DEPENDENCIES
numpy: 1.6.2
freetype2: 14.1.8
OPTIONAL BACKEND DEPENDENCIES
libpng: 1.2.49
Tkinter: no
* Using default library and include directories for
* Tcl and Tk because a Tk window failed to open.
* You may need to define DISPLAY for Tk to work so
* that setup can determine where your libraries are
* located. Tkinter present, but header files are not
* found. You may need to install development
* packages.
pkg-config: looking for pygtk-2.0 gtk+-2.0
* Package pygtk-2.0 was not found in the pkg-config
* search path. Perhaps you should add the directory
* containing `pygtk-2.0.pc' to the PKG_CONFIG_PATH
* environment variable No package 'pygtk-2.0' found
* Package gtk+-2.0 was not found in the pkg-config
* search path. Perhaps you should add the directory
* containing `gtk+-2.0.pc' to the PKG_CONFIG_PATH
* environment variable No package 'gtk+-2.0' found
* You may need to install 'dev' package(s) to
* provide header files.
Gtk+: no
* Could not find Gtk+ headers in any of
* '/usr/local/include', '/usr/include', '.'
Mac OS X native: no
Qt: no
Qt4: Qt: 4.8.1, PyQt4: 4.9.1
PySide: no
Cairo: 1.8.8
OPTIONAL DATE/TIMEZONE DEPENDENCIES
datetime: present, version unknown
dateutil: matplotlib will provide
pytz: matplotlib will provide
adding pytz
OPTIONAL USETEX DEPENDENCIES
dvipng: 1.14
ghostscript: 9.05
latex: 3.1415926
pdftops: 0.18.4