[Python-ideas] datetime.timedelta literals

[Pål Grønås Drange]

> What about
>
> 2.5*h - 14*min + 9300*ms * 2

That doesn't seem feasible to implement, however, that is essentially how
the
Pint [1] module works:

import pint
u = pint.UnitRegistry()
(2.5*u.hour - 14*u.min + 9300*u.ms) * 2
#  <Quantity(4.5385, 'hour')>

((2.5*u.hour - 14*u.min + 9300*u.ms) * 2).to('sec')
#  <Quantity(16338.6, 'second')>

> However why be limited to time units ? One would want in certain
> application to define other units, like meter ? Would we want a litteral
> for that ?

Pint works with all units imaginable:

Q = u.Quantity
Q(u.c, (u.m/u.s)).to('km / hour')
#  <Quantity(3.6 speed_of_light, 'kilometer / hour')>


However, the idea was just the six (h|min|s|ms|us|ns) time literals; I
believe
time units are used more often than other units, e.g. in constructs like

while end - start < 1min:
   poll()
   sleep(1s)  # TypeError
   sleep(1s.total_seconds())  # works, but ugly


[1] https://pypi.org/project/Pint/

Best regards,
Pål Grønås Drange
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