使用matplotlib不会阻塞的呼叫：
使用draw()：
from matplotlib.pyplot import plot, draw, show
plot([1,2,3])
draw()
print 'continue computation'
# at the end call show to ensure window won't close.
show()
使用交互模式：
from matplotlib.pyplot import plot, ion, show
ion() # enables interactive mode
plot([1,2,3]) # result shows immediatelly (implicit draw())
print 'continue computation'
# at the end call show to ensure window won't close.
show()
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