diff options
Diffstat (limited to 'Lib/timeit.py')
| -rw-r--r-- | Lib/timeit.py | 46 | 
1 files changed, 17 insertions, 29 deletions
diff --git a/Lib/timeit.py b/Lib/timeit.py index 4f7d28fbef..ead2030515 100644 --- a/Lib/timeit.py +++ b/Lib/timeit.py @@ -31,38 +31,29 @@ treated similarly.  If -n is not given, a suitable number of loops is calculated by trying  successive powers of 10 until the total time is at least 0.2 seconds. -The difference in default timer function is because on Windows, -clock() has microsecond granularity but time()'s granularity is 1/60th -of a second; on Unix, clock() has 1/100th of a second granularity and -time() is much more precise.  On either platform, the default timer -functions measure wall clock time, not the CPU time.  This means that -other processes running on the same computer may interfere with the -timing.  The best thing to do when accurate timing is necessary is to -repeat the timing a few times and use the best time.  The -r option is -good for this; the default of 3 repetitions is probably enough in most -cases.  On Unix, you can use clock() to measure CPU time. -  Note: there is a certain baseline overhead associated with executing a -pass statement.  The code here doesn't try to hide it, but you should -be aware of it.  The baseline overhead can be measured by invoking the -program without arguments. - -The baseline overhead differs between Python versions!  Also, to -fairly compare older Python versions to Python 2.3, you may want to -use python -O for the older versions to avoid timing SET_LINENO -instructions. +pass statement.  It differs between versions.  The code here doesn't try +to hide it, but you should be aware of it.  The baseline overhead can be +measured by invoking the program without arguments. + +Classes: + +    Timer + +Functions: + +    timeit(string, string) -> float +    repeat(string, string) -> list +    default_timer() -> float +  """  import gc  import sys  import time -try: -    import itertools -except ImportError: -    # Must be an older Python version (see timeit() below) -    itertools = None +import itertools -__all__ = ["Timer"] +__all__ = ["Timer", "timeit", "repeat", "default_timer"]  dummy_src_name = "<timeit-src>"  default_number = 1000000 @@ -180,10 +171,7 @@ class Timer:          to one million.  The main statement, the setup statement and          the timer function to be used are passed to the constructor.          """ -        if itertools: -            it = itertools.repeat(None, number) -        else: -            it = [None] * number +        it = itertools.repeat(None, number)          gcold = gc.isenabled()          gc.disable()          try:  | 
