[Python-modules-team] Bug#731572: python3-matplotlib: When I import matplotlib.pyplot I get errors (perhaps python3-dateutil version in sid is too old)

[L. Rahyen]

Package: python3-matplotlib
Version: 1.3.1-1
Severity: important

Dear Maintainer, I cannot import matplotlib.pyplot in python3. I think
that the reason for import errors is that python3-dateutil (2.0+dfsg1-1) is too
old, according to http://matplotlib.1069221.n5.nabble.com/python3-and-matplotlib-installation-problem-td3704.html
python3-matplotlib requieres at least python3-dateutil 2.1.

   * What led up to the situation?
I installed python3-matplotlib (1.3.1-1). This also automatically installed
python3-dateutil (2.0+dfsg1-1).

   * What exactly did you do (or not do) that was effective (or
     ineffective)?
To reproduce the problem run python3 and then "import matplotlib.pyplot".

   * What was the outcome of this action?
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/matplotlib/pyplot.py", line 29, in
<module>
    from matplotlib.figure import Figure, figaspect
  File "/usr/lib/python3/dist-packages/matplotlib/figure.py", line 36, in
<module>
    from matplotlib.axes import Axes, SubplotBase, subplot_class_factory
  File "/usr/lib/python3/dist-packages/matplotlib/axes.py", line 22, in
<module>
    import matplotlib.dates as _  # <-registers a date unit converter
  File "/usr/lib/python3/dist-packages/matplotlib/dates.py", line 119, in
<module>
    from dateutil.rrule import (rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY,
  File "/usr/lib/python2.6/dist-packages/dateutil/rrule.py", line 55
    raise ValueError, "Can't create weekday with n == 0"
                    ^
SyntaxError: invalid syntax

   * What outcome did you expect instead?
No errors.
-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.11-2-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages python3-matplotlib depends on:
ii  libc6                               2.17-96
ii  libfreetype6                        2.4.9-1.1
ii  libgcc1                             1:4.8.2-5
ii  libpng12-0                          1.2.49-5
ii  libstdc++6                          4.8.2-5
ii  python-matplotlib-data              1.3.1-1
ii  python3                             3.3.2-17
ii  python3-dateutil                    2.0+dfsg1-1
ii  python3-nose                        1.3.0-2.1
ii  python3-numpy [python3-numpy-abi9]  1:1.7.1-3
ii  python3-pyparsing                   2.0.1+dfsg1-1
ii  python3-six                         1.4.1-1
ii  python3-tornado                     3.1.1-1
ii  python3-tz                          2012c-1
pn  python3:any                         <none>
ii  tcl8.5                              8.5.14-2
ii  tk8.5                               8.5.14-2

Versions of packages python3-matplotlib recommends:
pn  python3-imaging  <none>
ii  python3-tk       3.3.3-1

Versions of packages python3-matplotlib suggests:
ii  dvipng                        1.14-2
ii  ghostscript                   9.05~dfsg-8
ii  gir1.2-gtk-3.0                3.8.6-1
ii  inkscape                      0.48.4-2
pn  ipython3                      <none>
ii  librsvg2-common               2.40.0-1
pn  python-matplotlib-doc         <none>
pn  python3-cairo                 <none>
ii  python3-gi [python3-gobject]  3.10.1-1
pn  python3-pyqt4                 <none>
pn  python3-scipy                 <none>
pn  python3-sip                   <none>
ii  texlive-extra-utils           2013.20131112-1
ii  texlive-latex-extra           2013.20131112-1
ii  ttf-staypuft                  0.04-6