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Python Generators
PySthlm Meetup #15 – Python
Best Practices – Oct 31, 2013
Samuel Lampa

twitter.com/smllmp
The “normal” (bad) way
The “normal” (bad) way

New temporary data structures
created and kept in memory
== BAD!!!
Using Generator function
Using Generator function

A yield (“return”) for
every iteration, so it can
be used immediately
without temp data structure
== GOOD!
Using Generator function

A yield (“return”) for
every iteration, so it can
be used immediately
without temp data structure
== GOOD!

So, this is the
generator function
Using Generator function

A yield (“return”) for
every iteration, so it can
be used immediately
without temp data structure
== GOOD!

So, this is the
generator function

… which can be
iterated over, like this ...
Using list-comprehension syntax
Using list-comprehension syntax

Here, the generator function
Is defined in one row
Chaining generator functions
Chaining generator functions
Creds and more info:
●

David Beazleys Python Generator intro:

→dabeaz.com/generators
David Beazley on twitter: @dabeaz
Thank you!
Samuel Lampa
G+: gplus.to/saml
twitter: @smllmp
Blog: saml.rilspace.org
Developer @
www.uppmax.uu.se
www.farmbio.uu.se
www.rilpartner.se

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Python Generators - Talk at PySthlm meetup #15