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Name: [002] Ian Ozsvald
Member: 128 months
Authored: 181 videos
Description: I am the co-founder of ShowMeDo (see, author of `The Screencasting Handbook <>`_ and the founder of the professional screencast production company `ProCasts <>`_: .. image:: ...

Variable Scope [ID:744] (3/14)

in series: Python Beginners - Common Variables and Containers

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Python has scoping rules - not all variables are global. Depending on your programming background you may be familiar with the idea of scope, you may well not know Python's scoping rules.

There is one particular 'gotcha' regarding global variables which I'll show - I've seen many beginners from other languages caught out by this.

Links - Scope Pitfalls, global notes,'s rules for scope.

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  • Published: 98 months ago

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Once again, very useful video, gives good overview of topic, what the pitfalls are in using local vs global variable scope, and references to other articles on topic.

Well explained. Thanks!

Learned a lot, thanks.

14. anonymous Wed, 29 Jul 2009 08:31

it good

Very Good! As one who has used Python for years I had joined to use the Boa Constructor Videos (quite good also).. I decided to examine the Python beginner and intermediate videos. I am not disappointed. Great refresher for all programmers as well as new programmers and transitioning programmers new to python.

I intend on sitting through all python tutorials available educational and entertaining.

Thanks for the effort.

Quite good. I need to figure out the scope rules.

makes sense so far...

thank you!

Coming to python with a background in VB and perl I had no idea about these scope issues. Thanks for the leg up!

Really makes clear the pitfall of using global. Thanks

Very nice tutorial, building on the previous tutorial and making the subject crystal-clear. Thanks a million!

Very nice tutorial, building on the previous tutorial and making the subject crysta-clear. Thanks a million!

Excellent tutorial - Well thought out example, clear, with a logical progression that builds on itself. In the end the goal of the tut is attained very well.

Great tutorial. Since I am not used to see global variables, I was quite surprised too, that it actually altered the global variable in that local scope.

I'm eager to watch the rest of this series. Please complete it yesterday!

Video published, thanks for contributing to ShowMeDo

Showmedo is a peer-produced video-tutorials and screencasts site for free and open-source software (FOSS)- with the exception of some club videos, the large majority are free to watch and download.

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Educating the Open-source Community With Showmedo

Although as important as the software it supports, education and documentation are relatively neglected in the Open-source world. Coders love to code, and explaining how best to use or improve the software tends to be deferred or even sidelined.

At Showmedo we believe the community can play a vital role here and also say thanks for the tools and software that make our lives easier. If you have a piece of software you love or a programming langugage you are enthusiastic about, why not make a screencast showing others how to use it? All the stuff you wish you'd been told, the tips, tricks, insights that would have saved you time and frustration.

Screencasting is easier than you think, and we're happy to help you. You can emailus for advice or just use some of the how-to screencasts on the site. This screencasting learning-pathis a good place to start.

Kudos and Thanks for Ian

3 Minute Oveview (What Does Python Look Like?)

simple and informative. you draw me in
70 months ago


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