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up vote 2 down vote favorite

I am trying to plot a simple function in Python. I use the following code:

# lineplot.py
import numpy as np
import pylab as pl
# Make an array of x values
x = [1, 2, 3, 4, 5]
# Make an array of y values for each x value
y = [1, 4, 9, 16, 25]
# use pylab to plot x and y
pl.plot(x, y)
# show the plot on the screen
pl.show()

However, the last line in which I want to see the output results in the following error:

AttributeError: 'NoneType' object has no attribute 'get_default_size'

Does anybody have any idea where I'm going wrong?

Full traceback of the error:

>>> pl.show()
Traceback (most recent call last):
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_gtk.py", line 394,\    in expose_event
    self._render_figure(self._pixmap, w, h)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_gtkagg.py", line 75, in _render_figure
    FigureCanvasAgg.draw(self)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 394, in draw
    self.figure.draw(self.renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/figure.py", line 798, in draw
    func(*args)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/axes.py", line 1946, in draw
    a.draw(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/axis.py", line 1017, in draw
    tick.draw(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/axis.py", line 234, in draw
    self.label1.draw(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/text.py", line 526, in draw
    bbox, info = self._get_layout(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/text.py", line 300, in _get_layout
    ismath=False)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 180, in get_text_width_height_descent
    font = self._get_agg_font(prop)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 226, in _get_agg_font
    size = prop.get_size_in_points()
    File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line 798, in get_size_in_points
    default_size = fontManager.get_default_size()
    AttributeError: 'NoneType' object has no attribute 'get_default_size'
    Traceback (most recent call last):
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_gtk.py", line 394, in expose_event
    self._render_figure(self._pixmap, w, h)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_gtkagg.py", line 75, in _render_figure
    FigureCanvasAgg.draw(self)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 394, in draw
    self.figure.draw(self.renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/figure.py", line 798, in draw
    func(*args)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/axes.py", line 1946, in draw
    a.draw(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/axis.py", line 1017, in draw
    tick.draw(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/axis.py", line 234, in draw
    self.label1.draw(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/text.py", line 526, in draw
    bbox, info = self._get_layout(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/text.py", line 300, in _get_layout
    ismath=False)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 180, in get_text_width_height_descent
    font = self._get_agg_font(prop)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 226, in _get_agg_font
    size = prop.get_size_in_points()
    File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line 798, in get_size_in_points
    default_size = fontManager.get_default_size()
    AttributeError: 'NoneType' object has no attribute 'get_default_size'
    Traceback (most recent call last):
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_gtk.py", line 394, in expose_event
    self._render_figure(self._pixmap, w, h)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_gtkagg.py", line 75, in _render_figure
    FigureCanvasAgg.draw(self)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 394, in draw
    self.figure.draw(self.renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/figure.py", line 798, in draw
    func(*args)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/axes.py", line 1946, in draw
    a.draw(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/axis.py", line 1017, in draw
    tick.draw(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/axis.py", line 234, in draw
    self.label1.draw(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
    File "/usr/lib64/python2.7/site-packages/matplotlib/text.py", line 526, in draw
    bbox, info = self._get_layout(renderer)
    File "/usr/lib64/python2.7/site-packages/matplotlib/text.py", line 300, in _get_layout
    ismath=False)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 180, in get_text_width_height_descent
    font = self._get_agg_font(prop)
    File "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_agg.py", line 226, in _get_agg_font
    size = prop.get_size_in_points()
    File "/usr/lib64/python2.7/site-packages/matplotlib/font_manager.py", line 798, in get_size_in_points
    default_size = fontManager.get_default_size()
    AttributeError: 'NoneType' object has no attribute 'get_default_size'
share|improve this question
 
What version of python and matplotlib are you using? The code ran fine here so there might be something else wrong. –  M4rtini Jan 7 at 20:40
 
Can you try using matplotlib directly instead of going through pylab? i.e. import matplotlib.pyplot as pl instead of import pylab as pl? –  Hannes Ovrén Jan 7 at 20:40
 
@M4rtini I'd say it's my backend, or whatever device i'm using to plot within. Version of python is 2.7. Matplotlib is version 1.0.1 –  stars83clouds Jan 7 at 20:42
 
@HannesOvrén - I still get the same error when i use matplotlib directly. –  stars83clouds Jan 7 at 20:44
1  
What backend do you use? You should get it from python -c 'import matplotlib; print(matplotlib.backends.backend)' –  Francesco Montesano Jan 7 at 20:53
show 7 more comments

1 Answer

up vote 1 down vote accepted

The problem was the version (1.0.1) of matplotlib used by the OP. Upgrading it solved the problem (as the discussion in chat clarified).

This is how we solved the problem (it should work on Linux):

  1. Download the latest matplotlib tar file from the download page
  2. extract the tar.gz archive
  3. cd into the matplotlib directory

  4. run 

    python setup.py build

    If it fails complaining about some header file (e.g. png.h) install the relevant -devel packages from the system repository. For sure python-devel and libpng12-devel are needed

  5. run

    python setup.py install --user

    It will install matplotlib in $HOME/.local/lib/pythonX.X/site-packages. This directory is loaded in the python path before any of the system wide ones. Plus there are no risks of messing up the system wide installations.

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