timeit

What is the best way to create a new empty list in Python? l = [] or l = list() I am asking this because of two reasons: Technical reasons, as to which is faster. (creating a class causes overhead?) Code readability - which one is the standard convention. unutbu Here is how you can test which piece of code is faster: % python -mtimeit "l=[]" 10000000 loops, best of 3: 0.0711 usec per loop % python -mtimeit "l=list()" 1000000 loops, best of 3: 0.297 usec per loop However, in practice, this initialization is most likely an extremely small part of your program, so worrying about this is probably

I'm trying to find out how much time it takes to execute a Python statement, so I looked online and found that the standard library provides a module called timeit that purports to do exactly that: import timeit def foo(): # ... contains code I want to time ... def dotime(): t = timeit.Timer("foo()") time = t.timeit(1) print "took %fs\n" % (time,) dotime() However, this produces an error: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 3, in dotime File "/usr/local/lib/python2.6/timeit.py", line 193, in timeit timing = self.inner(it, self.timer) File

I obtained very surprising results with timeit, can someone tell me if I am doing something wrong ? I am using Python 2.7. This is the contents of file speedtest_init.py: import random to_count = [random.randint(0, 100) for r in range(60)] These are the contents of speedtest.py: __author__ = 'BlueTrin' import timeit def test_init1(): print(timeit.timeit('import speedtest_init')) def test_counter1(): s = """\ d = defaultdict(int); for i in speedtest_init.to_count: d[i] += 1 """ print(timeit.timeit(s, 'from collections import defaultdict; import speedtest_init;')) def test_counter2(): print

I'm trying to time some code. First I used a timing decorator: #!/usr/bin/env python import time from itertools import izip from random import shuffle def timing_val(func): def wrapper(*arg, **kw): '''source: http://www.daniweb.com/code/snippet368.html''' t1 = time.time() res = func(*arg, **kw) t2 = time.time() return (t2 - t1), res, func.__name__ return wrapper @timing_val def time_izip(alist, n): i = iter(alist) return [x for x in izip(*[i] * n)] @timing_val def time_indexing(alist, n): return [alist[i:i + n] for i in range(0, len(alist), n)] func_list = [locals()[key] for key in locals()

I've a python script which works just as it should, but I need to write the execution time. I've googled that I should use timeit but I can't seem to get it to work. My Python script looks like this: import sys import getopt import timeit import random import os import re import ibm_db import time from string import maketrans myfile = open("results_update.txt", "a") for r in range(100): rannumber = random.randint(0, 100) update = "update TABLE set val = %i where MyCount >= '2010' and MyCount < '2012' and number = '250'" % rannumber #print rannumber conn = ibm_db.pconnect("dsn=myDB","usrname",