An elegant one-line solution to extract data from Nested Tuples from divmod

Question

assuming the following code:

from datetime import datetime

start_time = datetime.now()
end_time = datetime.now()

delta = end_time - start_time
delta_ms = delta.microseconds

what is the most elegant way to simplify the conversion of the timedelta object to mins,secs and millisecs?

The one-liner I have below, requires two calculations of divmod(delta_ms,1000), is there any way, keeping it to one line, that it only needs to be calculated once?

mins,secs,ms = divmod(divmod(delta_ms,1000),60) + (divmod(delta_ms,1000)[1],)

I also have the following, which is two lines of code but only calculates divmod(delta_ms,1000) once:

unwrap = lambda x: divmod(x[0],60) + (x[1],)
mins,secs,ms = unwrap(divmod(delta_ms,1000))

[divmod](https://docs.python.org/2/library/functions.html#divmod) is a built in python function that returns a tuple — Alexander McFarlane, Apr 14 '15 at 04:13
what's wrong with assigning the results of `divmod(delta_ms,1000)` to a pair of local variables?? — wim, Apr 14 '15 at 04:16
nothing is wrong with that. It is more the theoretical solution that I am interested in of combining the expression into one line — Alexander McFarlane, Apr 14 '15 at 04:31

A.J. Uppal · Accepted Answer · 2015-04-14T04:37:56.580

2

First of all, you missed a [0] in your second divmod :) You might want to change that:

mins,secs,ms = divmod(divmod(delta_ms,1000)[0],60) + (divmod(delta_ms,1000)[1],)

Answering your question, if you are looking for elegant based on amount of lines it takes up, than your above solution would the most so. However, you are running divmod an extra, unnecessary time, which can be solved in one-line (much less elegant, uses ;):

var1, var2 = divmod(delta_ms,1000);mins,secs,ms = divmod(var1,60) + (var2,)

Or two lines:

var1, var2 = divmod(delta_ms,1000)
mins,secs,ms = divmod(var1,60) + (var2,)

edited Apr 14 '15 at 04:37

answered Apr 14 '15 at 04:20

A.J. Uppal

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nicer is `var1, var2 = divmod(...)` – wim Apr 14 '15 at 04:22
can you explain the `_var = divmod(delta_ms,1000);mins,secs,ms` part especially the use of `_` – Alexander McFarlane Apr 14 '15 at 04:24
@wim true, unpacking should be the way to go :) thanks! – A.J. Uppal Apr 14 '15 at 04:36
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@alexmcf the `_` does not alter the variable in any way (apart from the name), it is just part of a convention that I follow :) – A.J. Uppal Apr 14 '15 at 04:37

An elegant one-line solution to extract data from Nested Tuples from divmod

1 Answers1