[Matplotlib-users] Importing pyplot blocks input thread

[John M. <mcf...@gm...>]

I am trying to write some code that uses an input thread to check for user
input while another thread is running some calculations (see example below). 
What I have noticed is that just including an import of pyplot (regardless
of whether it is used by the code or not) causes the call to raw_input in
the input thread to block the main thread.  It works fine when I don't
import pyplot.  Importing pyplot is a consequence of other libraries that I
need to use in the code, so I would like to find a way to make this work.

I have python 2.7.3, matplotlib 1.2.0, and am currently using the GTKAgg
backend.  Any help is much appreciated.

Here is the example code:

import time
import threading
import matplotlib.pyplot  # Works fine if this is commented out

def input_thread():
    raw_input('Press a key:')
    print "Input data received"

thread = threading.Thread(target=input_thread)
thread.start()
time.sleep(.01)
print

# Main thread (e.g. a calculation that can take some time)
for i in xrange(10):
    print i
    time.sleep(.5)



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