timeit Questions
1
Solved
I am trying to run a particular test multiple times in ipython using the
%timeit magic function. For demonstration purposes, I will just use -n1 instead of
-n3 here, and use a simple print(1) funct...
1
Solved
I am trying to the run the following code but I get a local variable 'a' referenced before assignment.
a = [x for x in range(10)]
b = [x for x in range(10)]
%timeit a+=b
The statement works wit...
1
I'm new to Python and trying to plot the computational speeds of two functions. For example, having defining two functions (see below), how can I return the time for each iteration using the timeit...
Dissever asked 11/1, 2018 at 11:24
5
Suppose I have some function that takes an array and changes every element to be 0.
def function(array):
for i in range(0,len(array)):
array[i] = 0
return array
I want to test how long this fu...
2
Solved
I can't seem to get timeit.timeit to work when I have exceptions in the statement argument passed as string:
# after the first and third semicolon, I put 4 spaces
timeit.timeit('try:; a=1;except:...
5
Solved
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:...
4
Solved
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 ...
Smatter asked 4/6, 2010 at 7:26
2
Solved
I need to time the execution of a function across variable amounts of data.
def foo(raw_data):
preprocessed_data = preprocess_data(raw_data)
time = timeit.Timer('module.expensive_func(preprocess...
Taishataisho asked 10/9, 2014 at 15:4
4
Solved
I am new to using the timeit module, and I'm having a hard time getting multi-line code snippets to run inside timeit.
What works:
timeit.timeit(stmt = "if True: print('hi');")
What does not wo...
1
Solved
I'm running Python 2.7.10 on a 16GB, 2.7GHz i5, OSX 10.11.5 machine.
I've observed this phenomenon many times in many different types of examples, so the example below, though a bit contrived, is...
Lalise asked 27/9, 2016 at 18:37
2
Solved
I want to measure the number of clock cycles it takes to do an addition operation in Python 3.
I wrote a program to calculate the average value of the addition operation:
from timeit import tim...
2
Trying to time different random functions to see fastest way to choose random item from list. %timeit wants to give me "best of 3" fastest times, but because the runs are random, there's high varia...
1
Solved
I do not see the rationale why python's timeit module measures the time using the best of 3. Here is an example from my console:
~ python -m timeit 'sum(range(10000))'
10000 loops, best of 3: 119 ...
Barcus asked 28/12, 2015 at 19:46
1
Solved
Sorting a list of tuples (dictionary keys,values pairs where the key is a random string) is faster when I do not explicitly specify that the key should be used (edit: added operator.itemgetter(0) f...
Fourflush asked 24/12, 2015 at 16:35
1
Solved
I would like to evaluate the performance of numexpr module in python (2.7). For that purpose, I created a random sparse matrix of size (10^5, 10^5). However, the script below throws an error at the...
Frangipane asked 20/11, 2015 at 10:41
1
Solved
I don't know how to interpret the output from Python's timeit.timeit() function. My code is as follows:
import timeit
setup = """
import pydash
list_of_objs = [
{},
{'a': 1, 'b': 2, 0: 0},
{'a...
Isherwood asked 17/8, 2015 at 20:3
2
Solved
In all of the places I read about timeit I found only that I can use variables in this way:
s1 = 'abc'
s2 = 'abc'
timeit.timeit('s1==s2', 'from __main__ import s1, s2', number=10**4)
or
s...
7
Solved
I need to measure the time certain parts of my program take (not for debugging but as a feature in the output). Accuracy is important because the total time will be a fraction of a second.
I was g...
2
I'd like to measure the execution speed of the following code:
def pe1():
l = []
for i in range(1000):
if i%3 == 0 or i%5 == 0:
l.append(i)
print sum(l)
I stored this code under pe1m.py .
N...
Yalonda asked 12/4, 2012 at 22:12
1
Solved
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 ...
Hydrostatics asked 6/1, 2015 at 15:35
5
Let me start off by saying I know almost nothing about python but have to write a program in three different languages (already done in java and c++).
I need to be able to time the execution of a ...
2
Solved
I want to capture and plot the results from 5 or so timeit calls with logarithmically increasing sizes of N to show how methodX() scales with input.
So far I have tried:
output = %timeit -r 10 re...
Tinsmith asked 26/6, 2013 at 2:48
3
Solved
Below the performance difference between Slice and manual reverse operation. If this is the case, What is the reason for that?
timeit.timeit("a[::-1]","a=[1,2,3,4,5,6]",number=100)
6.0543279687408...
Snowfield asked 12/8, 2014 at 7:29
1
Solved
I think these 3 are logically equivalent, returning the set {1, 3, 4}:
set(sum(((1, 3), (4,), (1,)), ()))
set(sum([[1, 3], [4], [1]], []))
functools.reduce(operator.or_, ({1, 3}, {4}, {1}), set())...
3
Solved
I was playing around with timeit and noticed that doing a simple list comprehension over a small string took longer than doing the same operation on a list of small single character strings. Any ex...
Distend asked 26/5, 2014 at 1:9
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