[Matplotlib-users] Trying to migrate to Python 3.2, Matplotlib 1.2.1

[John L. <joh...@sb...>]

Hello everyone,

After not using Matplotlib for over a year, I'm returning to it. 
Meanwhile, I have upgraded from Python 2.7 to Python 3.2, and I want to 
do all of my software development in Python 3 from now on.

My OS is Ubuntu 12.04.1.  Python 2.7 is still the default Python for 
Ubuntu, and many of the Python 3 packages are not offered as official 
repositories yet. I downloaded Matplotlib 1.2.1, then built it using 
Python 3.  Eventually, I got no build error messages, and proceeded to 
install. (I always have to pick through dependency problems one error 
message at a time.  I wish there was a better way.  The Matplotlib docs 
could be a little better in this respect.)

When I open a Python3 interpreter, I can import matplotlib.  But I am 
not seeing ANYTHING with commands like plt.show().  It executes, and 
then returns.  No output is generated.

This very short and simple test program of mine used to produce output 
with Python 2.7 and Matplotlib 1.1.0.  But with Python 3 and Matplolib 
1.2.1, I am getting nothing...

import numpy as np
import matplotlib.pyplot as plt

x = np.arange(0, 5, 0.1);
y = np.sin(x)
plt.plot(x, y)
plt.show()

It runs.  No error messages are generated.  But I don't get a graph. I 
don't even see a graph flicker on to the screen and disappear an instant 
later.

Any advice will be appreciated!