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Issue #28469: timeit now uses the sequence 1, 2, 5, 10, 20, 50,... instead

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of 1, 10, 100,... for autoranging.
This commit is contained in:
Serhiy Storchaka 2016-10-23 15:17:05 +03:00
parent f8d7d41507
commit d3ff784f2d
4 changed files with 63 additions and 47 deletions
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25
Lib/timeit.py
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@ -208,22 +208,23 @@ class Timer:
def autorange(self, callback=None):
"""Return the number of loops so that total time >= 0.2.
Calls the timeit method with *number* set to successive powers of
ten (10, 100, 1000, ...) up to a maximum of one billion, until
the time taken is at least 0.2 second, or the maximum is reached.
Returns ``(number, time_taken)``.
Calls the timeit method with increasing numbers from the sequence
1, 2, 5, 10, 20, 50, ... until the time taken is at least 0.2
second. Returns (number, time_taken).
If *callback* is given and is not None, it will be called after
each trial with two arguments: ``callback(number, time_taken)``.
"""
for i in range(0, 10):
number = 10**i
time_taken = self.timeit(number)
if callback:
callback(number, time_taken)
if time_taken >= 0.2:
break
return (number, time_taken)
i = 1
while True:
for j in 1, 2, 5:
number = i * j
time_taken = self.timeit(number)
if callback:
callback(number, time_taken)
if time_taken >= 0.2:
return (number, time_taken)
i *= 10
def timeit(stmt="pass", setup="pass", timer=default_timer,
number=default_number, globals=None):