using high performance time.perf_counter() to time functions

''' str_count_sub_timing_hperf.py
timing functions that count the number of sub_strings in a string
using high performance time.perf_counter()
new in Python 3.3 and higher
'''

import time
import re

def count_tony(text, sub):
    return sum(text[n:].startswith(sub)
           for n in range(len(text) - len(sub) + 1))

def count_snip(text, sub):
    return len(re.findall(r'(?={})'.format(sub), text))

def count_snee(text, sub, start=0):
    count = 0
    while True:
        ix = text.find(sub, start)
        if ix < 0: break
        start = ix + 1
        count += 1
    return count

text = "this person assesses your performance"
sub = "sses"

# returned value is in fractional seconds
start = time.perf_counter()
result1 = count_tony(text, sub)
end = time.perf_counter()

elapsed = end - start
print("count_tony('{}', '{}') = {}".format(text, sub, result1))
print("elapsed time = {:0.6f} micro_seconds".format(elapsed*1000000))

start2 = time.perf_counter()
result2 = count_snee(text, sub)
end2 = time.perf_counter()

elapsed2 = end2 - start2
print("count_snee('{}', '{}') = {}".format(text, sub, result2))
print("elapsed time = {:0.6f} micro_seconds".format(elapsed2*1000000))

start3 = time.perf_counter()
result3 = count_snip(text, sub)
end3 = time.perf_counter()

elapsed3 = end3 - start3
print("count_snip('{}', '{}') = {}".format(text, sub, result3))
print("elapsed time = {:0.6f} micro_seconds".format(elapsed3*1000000))

''' result (Python 3.4.1 64bit)-->
count_tony('this person assesses your performance', 'sses') = 2
elapsed time = 38.228700 micro_seconds

count_snee('this person assesses your performance', 'sses') = 2
elapsed time = 5.119915 micro_seconds

count_snip('this person assesses your performance', 'sses') = 2
elapsed time = 130.387175 micro_seconds

'''