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Groups > comp.lang.python > #198037
| From | ram@zedat.fu-berlin.de (Stefan Ram) |
|---|---|
| Newsgroups | comp.lang.python, comp.lang.c |
| Subject | Re: myrkraverk.c |
| Date | 2026-09-20 13:48 +0000 |
| Organization | Stefan Ram |
| Message-ID | <time-20260920143911@ram.dialup.fu-berlin.de> (permalink) |
| References | (4 earlier) <WjCrS.369387$G71.22768@fx17.ams4> <extension-20260919213739@ram.dialup.fu-berlin.de> <w9OrS.493051$a02.195416@fx11.ams4> <bits-20260920132258@ram.dialup.fu-berlin.de> <BgRrS.204631$Nn1.110223@fx18.ams4> |
Cross-posted to 2 groups.
"Johann \"Myrkraverk\" Oskarsson" <johann@myrkraverk.invalid> wrote or quoted:
>Perhaps I should have made that clearer in the code comments?
No, I was too focused on just that one line,
not paying attention to the global context.
>A bit more worrying is that I do not off hand know how to time my cre-
>ation. This is because /timeit/ can't find it.
Maybe you can pass the globals which should contain the name
"count_lsb":
timeit.timeit("count_lsb(1 << 125)", globals=globals())
. The optional "globals" argument specifies a namespace in
which to execute the code.
You could also try the pattern,
start_time = timeit.default_timer()
count_lsb(1<<125)
dt = timeit.default_timer() - start_time
. However, when "count_lsb(1<<125)` is very fast, the results
might be less accurate. (You can ask your chatbot about
"pitfalls of microbenchmarks in Python".)
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( n & -n ).bit_length() - 1 ## Really? "Johann \"Myrkraverk\" Oskarsson" <johann@myrkraverk.invalid> - 2026-09-20 01:56 +0800
Re: ( n & -n ).bit_length() - 1 ## Really? ram@zedat.fu-berlin.de (Stefan Ram) - 2026-09-19 18:23 +0000
Re: ( n & -n ).bit_length() - 1 ## Really? "Johann \"Myrkraverk\" Oskarsson" <johann@myrkraverk.invalid> - 2026-09-20 03:15 +0800
Re: ( n & -n ).bit_length() - 1 ## Really? Lane W <cactus_DAC@yahoo.com> - 2026-09-19 13:37 -0600
Re: ( n & -n ).bit_length() - 1 ## Really? "Johann \"Myrkraverk\" Oskarsson" <johann@myrkraverk.invalid> - 2026-09-20 04:32 +0800
Re: ( n & -n ).bit_length() - 1 ## Really? ram@zedat.fu-berlin.de (Stefan Ram) - 2026-09-19 20:39 +0000
Re: ( n & -n ).bit_length() - 1 ## Really? "Johann \"Myrkraverk\" Oskarsson" <johann@myrkraverk.invalid> - 2026-09-20 04:56 +0800
myrkraverk.c (was: Re: ( n & -n ).bit_length() - 1 ## Really?) "Johann \"Myrkraverk\" Oskarsson" <johann@myrkraverk.invalid> - 2026-09-20 18:00 +0800
Re: myrkraverk.c ram@zedat.fu-berlin.de (Stefan Ram) - 2026-09-20 12:25 +0000
Re: myrkraverk.c "Johann \"Myrkraverk\" Oskarsson" <johann@myrkraverk.invalid> - 2026-09-20 21:33 +0800
Re: myrkraverk.c ram@zedat.fu-berlin.de (Stefan Ram) - 2026-09-20 13:48 +0000
Re: myrkraverk.c "Johann \"Myrkraverk\" Oskarsson" <johann@myrkraverk.invalid> - 2026-09-20 22:09 +0800
jacobi_symbol.py (was: Re: myrkraverk.c) Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-21 20:34 +0800
Re: jacobi_symbol.py Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-22 15:20 +0800
Re: jacobi_symbol.py Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-25 23:32 +0800
Re: ( n & -n ).bit_length() - 1 ## Really? "Johann \"Myrkraverk\" Oskarsson" <johann@myrkraverk.invalid> - 2026-09-20 04:52 +0800
Re: ( n & -n ).bit_length() - 1 ## Really? Paul Rubin <no.email@nospam.invalid> - 2026-09-19 14:50 -0700
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