Today I was looking for a quick and dirty way to profile a method of a class.
I was thinking that cProfile module had a decorator for this but I was
wrong so I decided to write one based on hotshot.
Would it be worth for inclusion?
#!/usr/bin/env python
import hotshot
import hotshot.stats
import tempfile
import pstats
def profile(sort='cumulative', lines=30, strip_dirs=False):
"""A decorator which profiles a callable.
Example usage:
>>> @profile()
... def factorial(n):
... n = abs(int(n))
... if n < 1:
... n = 1
... x = 1
... for i in range(1, n+1):
... x = i * x
... return x
...
>>> factorial(5)
1 function calls in 0.000 CPU seconds
Ordered by: internal time, call count
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.000 0.000 0.000 0.000 profiler.py:60(factorial)
0 0.000 0.000 profile:0(profiler)
120
>>>
"""
def outer(fun):
def inner(*args, **kwargs):
file = tempfile.NamedTemporaryFile()
prof = hotshot.Profile(file.name)
try:
ret = prof.runcall(fun, *args, **kwargs)
finally:
prof.close()
stats = hotshot.stats.load(file.name)
if strip_dirs:
stats.strip_dirs()
if isinstance(sort, tuple):
stats.sort_stats(*sort)
else:
stats.sort_stats(sort)
stats.print_stats(lines)
return ret
return inner
return outer
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