Notes taken during a Performance talk given at PyConUK.
c method instead
list comprehension is quicker than for loop over an emnumerator
What is op?
xrange vs range
– no wasted memory
NB: In python3 renamed range
Or use a c extension
l.sort vs sorted() – any iterator
look up operator -> operator.itemgetter
Can use on object attribute
“”.join([a, b, c]) faster but less readable
% method not that fast an ugly – don’t use
Int keys are faster than string keys
interned string keys – no garbage collection
sys.intern – P3
Variable look ups
Mentioned global variable trick
local var faster than global in general
Look up: Old style/new style classes??
Slot attributes ?? look up more just seemed to be attributes???
Don’t use exceptions as an often use case. => much faster say to use getattr than catch a valueexception
Try to rely on c methods
c profiler built into Python
cpython vs number – can make pythonrun as fast as C – suggestion