pure python code to do modular-arithmetic unit conversions?

[Dan Stromberg]

Is there already a pure python module that can do modular-arithmetic unit
conversions, like converting a huge number of seconds into months,
weeks... or a bandwidth measure into megabits/s or gigabits/s or
megabytes/s or gigabytes/s, whatever's the most useful (ala df -h)?

Thanks!

[Dan Bishop]

Re: pure python code to do modular-arithmetic unit conversions?

Dan Stromberg wrote:[color=blue]
> Is there already a pure python module that can do modular-arithmetic[/color]
unit[color=blue]
> conversions, like converting a huge number of seconds into months,
> weeks...[/color]

Use the divmod function.


SECONDS_PER_MON TH = 2629746 # 1/4800 of 400 Gregorian years

def convert_seconds (seconds):
"Return (months, weeks, days, hours, minutes, seconds)."
months, seconds = divmod(seconds, SECONDS_PER_MON TH)
minutes, seconds = divmod(seconds, 60)
hours, minutes = divmod(minutes, 60)
days, hours = divmod(hours, 24)
weeks, days = divmod(days, 7)
return months, weeks, days, hours, minutes, seconds

def to_seconds(mont hs, weeks, days, hours, minutes, seconds):
return (((weeks * 7 + days) * 24 + hours) * 60 + minutes) * 60 + \
seconds + months * SECONDS_PER_MON TH
[color=blue][color=green]
>> convert_seconds (10**9)[/color][/color]
(380, 1, 1, 1, 28, 40)[color=blue][color=green][color=darkred]
>>> to_seconds(*_)[/color][/color][/color]
1000000000
[color=blue]
> or a bandwidth measure into megabits/s or gigabits/s or
> megabytes/s or gigabytes/s, whatever's the most useful (ala df -h)?[/color]

def convert_bytes(b ytes):
PREFIXES = ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y']
x = bytes
for prefix in PREFIXES:
if x < 1024:
return '%.4g %sB' % (x, prefix)
x /= 1024.
# No SI prefixes left, so revert to scientific notation
return '%.3e B' % bytes[color=blue][color=green][color=darkred]
>>> convert_bytes(4 0e9)[/color][/color][/color]
'37.25 GB'[color=blue][color=green][color=darkred]
>>> convert_bytes(2 048)[/color][/color][/color]
'2 KB'

[Michael Spencer]

Re: pure python code to do modular-arithmetic unit conversions?

Dan Stromberg wrote:[color=blue]
> Is there already a pure python module that can do modular-arithmetic unit
> conversions, like converting a huge number of seconds into months,
> weeks... or a bandwidth measure into megabits/s or gigabits/s or
> megabytes/s or gigabytes/s, whatever's the most useful (ala df -h)?
>
> Thanks!
>[/color]
Take a look at:

http://home.tiscali.be/be052320/Unum_tutorial.html

From the intro:

"Unum stands for 'unit-numbers'. It is a Python module that allows to define and
manipulate true quantities, i.e. numbers with units such as 60 seconds, 500
watts, 42 miles-per-hour, 100 kg per square meter, 14400 bits per second, 30
dollars etc. The module validates unit consistency in arithmetic expressions; it
provides also automatic conversion and output formatting."

Michael