Dear Francesco,
Yes, I just tried it, it can be save perfectly.


From: Francesco Montesano <franz.bergesund@googlemail.com>
To: Dorm Eight <dormeight@yahoo.com>; matplotlib-users@lists.sourceforge.net
Sent: Friday, March 30, 2012 8:01 PM
Subject: Re: [Matplotlib-users] (no subject)

> ________________________________
> From: Francesco Montesano <franz.bergesund@googlemail.com>
> To: Dorm Eight <dormeight@yahoo.com>
> Cc: "matplotlib-users@lists.sourceforge.net"
> <matplotlib-users@lists.sourceforge.net>
> Sent: Tuesday, March 27, 2012 3:38 PM
> Subject: Re: [Matplotlib-users] (no subject)
>
> Il 27 marzo 2012 05:08, Dorm Eight <dormeight@yahoo.com> ha scritto:
>> 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!
>>
>
> Hi Dorm
> If you can send more info about the operating system and matplotlib
> version, it's easier to help you
> (for the latter do
> import matplotlib
> print matplotlib.__version__
> )
>
> Cheers,
> Francesco
>
>>
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>
>Il 30 marzo 2012 13:23, Dorm Eight <dormeight@yahoo.com> ha scritto:

Dear Dorm,

please reply to all the list.
>  My system is Fedora 3.3.0-4.fc16.x86_64, after I recently updated the
> system with 'yum update', the problem appeared.
> the Matplotlib version is 1.10. I have no idea at all now.

I've tested your small example on python 2.6, matplotlib 1.0.0 with
MacOSX backend and on Kubuntu 11.04, python 2.7, matplotlib 1.1, with
TkAgg and Qt4Agg backends and the small code works for me. In all
cases I have set "plt.ion()"

If you save the figure instead of showing, does it work?
Which backend are you using: the name is stored in "matplotlib.backends.backend"

Cheers
Francesco