new matplotlib tcl problem

[Marian Siwiak]

Hi,

I try to run a module starting with:

def mymodule(variables):
    import matplotlib
    matplotlib.use('Agg')
    from pymol import *

When I call it, I get error - piece of traceback is included below.

File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 343, in figure
    **kwargs)
  File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py", line 80, in new_figure_manager
    window = Tk.Tk()
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1712, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
TclError: no display name and no $DISPLAY environment variable

Google says this tclerror usually means that tk tries to get interactive, but I thought matplotlib.use('Agg') should prevent that.
Any advice?
Thanks in advance.

[Massimo Di Pierro]

Based on this: github.com/web2py/web2py

you are right

[Marian Siwiak]

Solved. 

Explanation below is for future reference, if someone will experience similar problem (as Massimo pointed it in a very gentle way, maybe not that obvious to an external reader, and this solution is applicable I guess to a very wide range of problems). 

Solution: It is always worth updating web2py to a newest version. 

I was a bit afraid it may screw something with my app, but I was SOOOO wrong!

Problem existed in version 1.99 and magically (yeach, sure!) disappeared in 2.5.1.

Thanks,

Marian

TAG: library problem, compatibility issues, environment variables, external library, matplotlib  

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[Marian Siwiak]

Ekhm. In a version 2.8 we go back to the very same problem from 1.99.
Did I miss something in matplotlib handling? search of the group didn't come with anything useful... there is a discussion on setting MPLCONFIGDIR setting to some tmp dir, but hey, in 2.5.1 everything works smoothly without it.

Very best regards,

On Wednesday, 17 July 2013 10:54:21 UTC+1, Marian Siwiak wrote:

Solved. 

Explanation below is for future reference, if someone will experience similar problem (as Massimo pointed it in a very gentle way, maybe not that obvious to an external reader, and this solution is applicable I guess to a very wide range of problems). 

Solution: It is always worth updating web2py to a newest version. 

I was a bit afraid it may screw something with my app, but I was SOOOO wrong!

Problem existed in version 1.99 and magically (yeach, sure!) disappeared in 2.5.1.

Thanks,

Marian

TAG: library problem, compatibility issues, environment variables, external library, matplotlib  

To unsubscribe from this group and all its topics, send an email to web2py+unsubscribe@googlegroups.com.