Are these list-comprehensions written the fastest possible way? [migrated]

Are these list-comprehensions written the fastest possible way? [migrated]

References

Reference NO 1

http://codereview.stackexchange.com/questions/23441/are-these-list-comprehensions-written-the-fastest-possible-way

Reference NO 2

http://wiki.python.org/moin/PythonSpeed/PerformanceTips

Reference NO 3

http://www.pytables.org/moin/FAQ

Reference NO 4

http://c2.com/cgi/wiki?PythonVsRuby

Reference NO 5

http://python3porting.com/problems.html

Reference NO 6

http://education.byu.edu/diversity/culture.html

Reference NO 7

http://blogs.esri.com/esri/arcgis/2012/08/30/field-mapping-and-python-scripting/

Reference NO 8

http://www.superteacherworksheets.com/animal-articles.html