iseq.py

"""
iseq.py - A script for comparing the speed of is, ==, and neither with boolean values
csm10495 - Charles Machalow - MIT License
Hint: Usually == is slowest. Neither is fastest
"""

import timeit

def testN(n=1000):
    """
    Description: 
        Runs a loop n times comparing a boolean value using neither "is" or "=="
    """
    
    for i in range(n):
        if True:
            pass
        else:
            pass

def testIs(n=1000):
    """
    Description: 
        Runs a loop n times comparing a boolean value using "is"
    """
    
    for i in range(n):
        if True is True:
            pass
        else:
            pass
            
def testEq(n=1000):
    """
    Description: 
        Runs a loop n times comparing a boolean value using "=="
    """
    
    for i in range(n):
        if True == True:
            pass
        else:
            pass

def timeN(n=1000):
    """
    Description: 
        Uses the timeit module to time n boolean comparisons using neither "==" or "is"
    """
    
    return timeit.timeit("testN(n=" + str(n) + ")", "from __main__ import testN")
    
def timeIs(n=1000):
    """
    Description: 
        Uses the timeit module to time n boolean comparisons using "is"
    """
    
    return timeit.timeit("testIs(n=" + str(n) + ")", "from __main__ import testIs")
    
def timeEq(n=1000):
    """
    Description: 
        Uses the timeit module to time n boolean comparisons using "=="
    """
    
    return timeit.timeit("testEq(n=" + str(n) + ")", "from __main__ import testEq")
    
def isVsEqVsN(n=1000):
    """
    Description: 
        Times n boolean comparisons using both "==", "is", and neither
        Results are printed to stdout
    """
    
    print("running %i trials of ==, is, and neither..." % n)
    is_time = timeIs(n)
    eq_time = timeEq(n)
    n_time = timeN(n)
    
    vals = {is_time: "is", eq_time: "eq", n_time: "neither"}
    ordered_vals = []
    for i in sorted(vals):
        ordered_vals.append(vals[i])
    
    print("is_time: %s seconds" % str(is_time)[:20])
    print("eq_time: %s seconds" % str(eq_time)[:20])
    print("n_time:  %s seconds" % str(n_time)[:20])
    
    print("Order of speed (1st is fastest): %s" % ordered_vals)
    
def isVsEq(n=1000):
    """
    Description: 
        Times n boolean comparisons using both "==" and "is"
        Results are printed to stdout
    """
    
    print("running %i trials of == and is..." % n)
    is_time = timeIs(n)
    eq_time = timeEq(n)
    
    print("is_time: %s seconds" % str(is_time)[:20])
    print("eq_time: %s seconds" % str(eq_time)[:20])
    
    if is_time > eq_time:
        print("eq is faster than is")
    elif is_time == eq_time:
        print("eq and is ran at the same speed... that is rather unlikely")
    else:
        print("is is faster than eq")