python - Gtk* backend requires pygtk to be installed -


from within virtual environment, trying load script uses matplotlib's gtkagg backend, fail following traceback:

traceback (most recent call last):   file "<stdin>", line 1, in <module>   file "/home/user/.virtualenvs/venv/local/lib/python2.7/site-packages/matplotlib/pyplot.py", line 97, in <module>     _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()   file "/home/user/.virtualenvs/venv/local/lib/python2.7/site-packages/matplotlib/backends/__init__.py", line 25, in pylab_setup     globals(),locals(),[backend_name])   file "/home/user/.virtualenvs/venv/local/lib/python2.7/site-packages/matplotlib/backends/backend_gtkagg.py", line 10, in <module>     matplotlib.backends.backend_gtk import gtk, figuremanagergtk, figurecanvasgtk,\   file "/home/user/.virtualenvs/venv/local/lib/python2.7/site-packages/matplotlib/backends/backend_gtk.py", line 16, in <module>     raise importerror("gtk* backend requires pygtk installed.") importerror: gtk* backend requires pygtk installed.

the code ran in order produce importerror follows:

import matplotlib mpl mpl.use('gtkagg') import matplotlib.pyplot plt

when running same code after deactivating virtual environment, goes well.

i assumed may due version differences; indeed, such differences exist on machine. however, version in virtual environment newer (1.2.0 versus 1.1.1rc), not expecting less support.

in case not clear: question how allow importing pyplot gtkagg backend on new version of matplotlib, or @ least attempt understand reasons import failure.

you created virtual evn like:

 $ virtualenv ~/.virtualenvs/my_env

by default can see none of system-installed packages (including pygtk) when try run mpl rightly complains not have pygtk installed because (with in context of virtualenv) not.

you can either build , install pygtk within virtualenv or can use

$ virtualenv --system-site-packages ~/.virtualenvs/my_env

(doc) make virtualenv inherit global packages.


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