hi, everybody!

when I run my script, why there is no figure show up? I downloaded the demos 
from matplotlib gallery and it didn't work either. 

>>> 
>>> x=np.arange(100)
>>> y=x**2+3*x-1
>>> pl.plot(x,y)
[<matplotlib.lines.Line2D object at 0x2581050>]
>>> pl.show()
>>> 
there is no error, no figure pop-up!

Thank you for any answer!
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