Difference between revisions of "Matplotlib dateutil bug"

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(Created page with "== Background == == See also == Category:matplotlib")
 
Line 1: Line 1:
 
== Background ==
 
== Background ==
 +
When you create a range in relax, it is created as an xrange object.<br>
 +
 +
You cannot by default slice through xrange objects.
 +
 +
The '''dateutil.rrule''' package used in matplotlib/pylab creates some list, which it expects it can slice through.<br>
 +
But relax will create these as '''xrange''' which is not-sliceable.
 +
 +
Let's try it out.
 +
 +
<source lang="python">
 +
USER@MACHINE: $ python
 +
 +
>>> x=range(10)
 +
>>> type(x)
 +
<type 'list'>
 +
>>> print x[:3]
 +
[0, 1, 2]
 +
>>> y=xrange(10)
 +
>>> type(y)
 +
<type 'xrange'>
 +
>>> print y[:3]
 +
Traceback (most recent call last):
 +
  File "<stdin>", line 1, in <module>
 +
TypeError: sequence index must be integer, not 'slice'
 +
</source>
 +
 +
<source lang="python">
 +
USER@MACHINE: $ relax
 +
 +
relax> x=range(10)
 +
relax> type(x)
 +
<type 'xrange'>
 +
relax> print x[:3]
 +
Traceback (most recent call last):
 +
  File "<console>", line 1, in <module>
 +
TypeError: sequence index must be integer, not 'slice'
 +
relax> y=list(range(10))
 +
relax> print y[:3]
 +
[0, 1, 2]
 +
relax>
 +
</source>
 +
 +
== The error when importing matplotlib / pyplot ==
 +
<source lang="python">
 +
USER@MACHINE: $ relax
 +
 +
relax> from pylab import *
 +
Traceback (most recent call last):
 +
  File "<console>", line 1, in <module>
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/pylab.py", line 1, in <module>
 +
    from matplotlib.pylab import *
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/pylab.py", line 221, in <module>
 +
    from matplotlib import mpl  # pulls in most modules
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/mpl.py", line 3, in <module>
 +
    from matplotlib import axes
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/axes.py", line 19, in <module>
 +
    import matplotlib.dates as mdates
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/dates.py", line 119, in <module>
 +
    from dateutil.rrule import rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY, \
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/dateutil/rrule.py", line 26, in <module>
 +
    MDAY366MASK = tuple(M31+M29+M31+M30+M31+M30+M31+M31+M30+M31+M30+M31+M31[:7])
 +
TypeError: unsupported operand type(s) for +: 'xrange' and 'xrange'
 +
</source>
 +
 +
== Change bug ==
 +
<source lang="bash">
 +
bash
 +
MFILE=`python -c "import dateutil.rrule; print(dateutil.rrule.__file__)"`
 +
echo $MFILE
 +
 +
</source>
 +
 +
Test if it worked
 +
<source lang="bash">
 +
$ relax
 +
relax> from pylab import *
 +
Traceback (most recent call last):
 +
  File "<console>", line 1, in <module>
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/pylab.py", line 1, in <module>
 +
    from matplotlib.pylab import *
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/pylab.py", line 221, in <module>
 +
    from matplotlib import mpl  # pulls in most modules
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/mpl.py", line 3, in <module>
 +
    from matplotlib import axes
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/axes.py", line 19, in <module>
 +
    import matplotlib.dates as mdates
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/dates.py", line 119, in <module>
 +
    from dateutil.rrule import rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY, \
 +
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/dateutil/rrule.py", line 26, in <module>
 +
    MDAY366MASK = tuple(M31+M29+M31+M30+M31+M30+M31+M31+M30+M31+M30+M31+M31[:7])
 +
TypeError: unsupported operand type(s) for +: 'xrange' and 'xrange'
 +
</source>
  
 
== See also ==
 
== See also ==
 
[[Category:matplotlib]]
 
[[Category:matplotlib]]

Revision as of 12:47, 10 December 2013

Background

When you create a range in relax, it is created as an xrange object.

You cannot by default slice through xrange objects.

The dateutil.rrule package used in matplotlib/pylab creates some list, which it expects it can slice through.
But relax will create these as xrange which is not-sliceable.

Let's try it out. 

USER@MACHINE: $ python

>>> x=range(10)
>>> type(x)
<type 'list'>
>>> print x[:3]
[0, 1, 2]
>>> y=xrange(10)
>>> type(y)
<type 'xrange'>
>>> print y[:3]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: sequence index must be integer, not 'slice'

USER@MACHINE: $ relax

relax> x=range(10)
relax> type(x)
<type 'xrange'>
relax> print x[:3]
Traceback (most recent call last):
  File "<console>", line 1, in <module>
TypeError: sequence index must be integer, not 'slice'
relax> y=list(range(10))
relax> print y[:3]
[0, 1, 2]
relax>

The error when importing matplotlib / pyplot

USER@MACHINE: $ relax

relax> from pylab import *
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/pylab.py", line 1, in <module>
    from matplotlib.pylab import *
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/pylab.py", line 221, in <module>
    from matplotlib import mpl  # pulls in most modules
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/mpl.py", line 3, in <module>
    from matplotlib import axes
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/axes.py", line 19, in <module>
    import matplotlib.dates as mdates
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/dates.py", line 119, in <module>
    from dateutil.rrule import rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY, \
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/dateutil/rrule.py", line 26, in <module>
    MDAY366MASK = tuple(M31+M29+M31+M30+M31+M30+M31+M31+M30+M31+M30+M31+M31[:7])
TypeError: unsupported operand type(s) for +: 'xrange' and 'xrange'

Change bug

bash
MFILE=`python -c "import dateutil.rrule; print(dateutil.rrule.__file__)"`
echo $MFILE

Test if it worked 

$ relax
relax> from pylab import *
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/pylab.py", line 1, in <module>
    from matplotlib.pylab import *
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/pylab.py", line 221, in <module>
    from matplotlib import mpl  # pulls in most modules
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/mpl.py", line 3, in <module>
    from matplotlib import axes
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/axes.py", line 19, in <module>
    import matplotlib.dates as mdates
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/dates.py", line 119, in <module>
    from dateutil.rrule import rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY, \
  File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/dateutil/rrule.py", line 26, in <module>
    MDAY366MASK = tuple(M31+M29+M31+M30+M31+M30+M31+M31+M30+M31+M30+M31+M31[:7])
TypeError: unsupported operand type(s) for +: 'xrange' and 'xrange'

See also

Retrieved from "http://wiki.nmr-relax.com/wiki/index.php?title=Matplotlib_dateutil_bug&oldid=1843"