# -- coding: utf-8 --
import cProfile
import pstats

a = None
b = 'Test'

left_column_width = 20
loop_range = range(20000000)

def test1():
    for i in loop_range:
        if a == None:
            pass

def test2():
    for i in loop_range:
        if a is None:
            pass

def test3():
    for i in loop_range:
        if a != None:
            pass

def test4():
    for i in loop_range:
        if a is not None:
            pass

def test5():
    for i in loop_range:
        if b == None:
            pass

def test6():
    for i in loop_range:
        if b is None:
            pass

def test7():
    for i in loop_range:
        if b != None:
            pass

def test8():
    for i in loop_range:
        if b is not None:
            pass

test1_profile = cProfile.Profile()
test1_profile.runcall(test1)
test1_profile.print_stats(sort='cumtime')

test2_profile = cProfile.Profile()
test2_profile.runcall(test2)
test2_profile.print_stats(sort='cumtime')

test3_profile = cProfile.Profile()
test3_profile.runcall(test3)
test3_profile.print_stats(sort='cumtime')

test4_profile = cProfile.Profile()
test4_profile.runcall(test4)
test4_profile.print_stats(sort='cumtime')

test5_profile = cProfile.Profile()
test5_profile.runcall(test5)
test5_profile.print_stats(sort='cumtime')

test6_profile = cProfile.Profile()
test6_profile.runcall(test6)
test6_profile.print_stats(sort='cumtime')

test7_profile = cProfile.Profile()
test7_profile.runcall(test7)
test7_profile.print_stats(sort='cumtime')

test8_profile = cProfile.Profile()
test8_profile.runcall(test8)
test8_profile.print_stats(sort='cumtime')

print('number of loops:'.ljust(left_column_width, ' '), len(loop_range), '\n')

print('a == None:'.ljust(left_column_width, ' '), pstats.Stats(test1_profile).total_tt)
print('a is None:'.ljust(left_column_width, ' '), pstats.Stats(test2_profile).total_tt, '\n')

print('a != None:'.ljust(left_column_width, ' '), pstats.Stats(test3_profile).total_tt)
print('a is not None:'.ljust(left_column_width, ' '), pstats.Stats(test4_profile).total_tt, '\n')

print('b == None:'.ljust(left_column_width, ' '), pstats.Stats(test5_profile).total_tt)
print('b is None:'.ljust(left_column_width, ' '), pstats.Stats(test6_profile).total_tt, '\n')

print('b != None:'.ljust(left_column_width, ' '), pstats.Stats(test7_profile).total_tt)
print('b is not None:'.ljust(left_column_width, ' '), pstats.Stats(test8_profile).total_tt, '\n')