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Speeds up the execution of Python code

'Psyco' helps execute Python code at speeds approaching that of fully compiled languages by using a technique called "specialization". This extension module for the unmodified interpreter accelerates user programs with little or no change in their sources. An increase in speed of 2 to 10 times is common.


User guide available in HTML format from; User guide available in PostScript format from
"IRC [] " IRC Help channel

"IRC [] " IRC development channel


Download version 1.6 (stable)
released on 16 December 2007

VCS Checkout



LicenseVerified byVerified onNotes
X11Janet Casey4 March 2004

Leaders and contributors

Armin Rigo Maintainer

Resources and communication

AudienceResource typeURI
DeveloperVCS Repository Webview
SupportMailing List Info/Archive

Software prerequisites

Required to usePython 2.1 or later (2.2.2 or later recommended)

This entry (in part or in whole) was last reviewed on 3 March 2017.


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