import pylab error - from six import unichr

[Doug Barrett]

Hi,

 

I'm running a stand-alone Psychopy installation (1.81.00) on a Windows 7 machine. I'm trying to plot the coordinates in an numpy.array and cannot import pylab (these will be screen coordinated but I wanted to check them).

 

Here's the code:

 

# Calculate N(x,y) on circumference of a circle

import numpy as np                                  # for maths on arrays
import pylab                                              # see Tutorial 3 for call.
#import matplotlib.pyplot as plt                 # alternate call

# Generate n points around the centre of a circle centred at [0, 0]
def xyLocsCircle(R):
    n = 10                                                    # n locations
    a = 360/n                                               # angle
    ang = np.arange(0, 360, a)                   # vector of angles
    # R = 100                                              # radius
    orig = np.array( [0,0] )                           # origin (x,y)
    # plot x,y coordinates on circumference of a circle (transform angles in degs to radians for np.cos and np.sin functions)
    xyLocs = np.zeros( (2, n) )
    xyLocs[0, ] = [orig[0] + R * np.cos(i) for i in ang * np.pi/180]
    xyLocs[1, ] = [orig[1] + R * np.sin(i) for i in ang * np.pi/180]
    return xyLocs

xy = xyLocsCircle(100)
print xy
pylab.plot(xy[0, ], xy[1, ])

Here's the error:

 

Traceback (most recent call last):
  File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.81.00-py2.7.egg\psychopy\app\_psychopyApp.py", line 374, in openUpdater
    dlg = connections.InstallUpdateDialog(parent=None, ID=-1, app=self)
  File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.81.00-py2.7.egg\psychopy\app\connections.py", line 246, in __init__
    self.updateStatus()
  File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.81.00-py2.7.egg\psychopy\app\connections.py", line 260, in updateStatus
    msg = _translate("PsychoPy v%(latest)s is available\nYou are running v%(running)s") % {'latest':self.latest['version'], 'running':self.runningVersion}
TypeError: 'NoneType' object has no attribute '__getitem__'
Traceback (most recent call last):
  File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.81.00-py2.7.egg\psychopy\app\_psychopyApp.py", line 374, in openUpdater
    dlg = connections.InstallUpdateDialog(parent=None, ID=-1, app=self)
  File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.81.00-py2.7.egg\psychopy\app\connections.py", line 246, in __init__
    self.updateStatus()
  File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.81.00-py2.7.egg\psychopy\app\connections.py", line 260, in updateStatus
    msg = _translate("PsychoPy v%(latest)s is available\nYou are running v%(running)s") % {'latest':self.latest['version'], 'running':self.runningVersion}
TypeError: 'NoneType' object has no attribute '__getitem__'

 

I had a look on stackoverflow and there's a revlevant post at: http://stackoverflow.com/questions/25920510/python-matplotlib-not-importing-due-to-failure-to-import-unichr It's possible the version of six installed is out-of-date (I've got 1.3.0) but I'm not sure how to update this?

 

Any help, much appreciated!

 

Thanks.

 

 

[Jeremy Gray]

Hi Doug,

Based on the error (the actual error is: TypeError: 'NoneType' object has no attribute '__getitem__'), this looks like an issue in PsychoPy, and has nothing to do with importing pylab that I can see. (My guess is that self.latest is None, and so self.latest['version'] gives the NoneType error. This should not happen, or the error message should be more helpful than this.)

I suggest trying to start PsychoPy without running your script (e.g., double click the PsychoPy icon), do the update, and then try your script. Hopefully this will avoid trying to display the update dialog window, and avoid that issue.

Also, from the code you posted, the update window should not be displayed. So I am not sure that I understand the full story here.

--Jeremy

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[Rebecca Sharman]

Hi all,

I'm also having a problem making pylab work in 1.81. I am trying to use plotting scripts that had previously worked so I tried the simplest possible test and typed 'import pylab' into the shell window and it produced the following error.

import pylab

Traceback (most recent call last):

  File "<input>", line 1, in <module>

  File "C:\Program Files (x86)\My81PsychoPy2\lib\site-packages\pylab.py", line 1, in <module>

    from matplotlib.pylab import *

  File "C:\Program Files (x86)\My81PsychoPy2\lib\site-packages\matplotlib\pylab.py", line 231, in <module>

    import matplotlib.finance

  File "C:\Program Files (x86)\My81PsychoPy2\lib\site-packages\matplotlib\finance.py", line 38, in <module>

    from matplotlib.collections import LineCollection, PolyCollection

  File "C:\Program Files (x86)\My81PsychoPy2\lib\site-packages\matplotlib\collections.py", line 27, in <module>

    import matplotlib.backend_bases as backend_bases

  File "C:\Program Files (x86)\My81PsychoPy2\lib\site-packages\matplotlib\backend_bases.py", line 56, in <module>

    import matplotlib.textpath as textpath

  File "C:\Program Files (x86)\My81PsychoPy2\lib\site-packages\matplotlib\textpath.py", line 22, in <module>

    from matplotlib.mathtext import MathTextParser

  File "C:\Program Files (x86)\My81PsychoPy2\lib\site-packages\matplotlib\mathtext.py", line 26, in <module>

    from six import unichr

ImportError: cannot import name unichr

Generally I'm happy to give a bit of bug fixing a go, but in this case I don't even know where to start! Any ideas gratefully received.

Thanks,

Becky

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[Doug Barrett]

Hi Jeremy,

 

I've done as you suggested but I don't have the option to update as I'm running the latest version (I only downloaded it a couple of days ago and I've installed v1.81.00). My problem is identical to Rebecca's - when I try "import pylab" I get the idential "ImportError"

 

Thanks, Doug.

[Jonathan Peirce]

Apparently pylab requires a newer version of the module called `six` than the version that ships with python. But it's a single file so pretty easy to replace:

Go to the folder
    program files/psychopy2/Lib/site-packages
remove the two files
    six.py and six.pyc
These were six version 1.3.0

Copy into that folder the attached copy of six (v 1.8.0)

I'll make sure I build another full installer with the updated version for the next incremental release.

cheers,
Jon

To view this discussion on the web visit https://groups.google.com/d/msgid/psychopy-users/CAHnHNHeCG98MqdLQF-jgjTy_%3Dd435t1VRNRhgUOkdNOb06s12g%40mail.gmail.com.

For more options, visit https://groups.google.com/d/optout.

-- 
Jon Peirce
http://www.peirce.org.uk

[Rebecca Sharman]

Fantastic! Thanks for such an easy fix :)

Cheers,

Becky

To view this discussion on the web visit https://groups.google.com/d/msgid/psychopy-users/544E328F.6020708%40gmail.com.

[Doug Barrett]

Hi John, just-the-job thanks, it's plotting fine now.

 

Doug.