If you're trying to, e.g., subtract a list of dicts from another list of dicts, but the list to subtract is large, what do you do? If you can decorate your values in some way that they're hashable, that solves the …

Apr 1, 2012 · How would you define a " subtract " function? For sum, it's intuitive. You just add all the numbers. But for subtraction, what are you subtracting from and what are you subtracting?

How to subtract datetimes with python Asked 14 years, 10 months ago Modified 2 years, 8 months ago Viewed 86k times

Subtracting datetime objects with Python Asked 13 years, 3 months ago Modified 1 year, 1 month ago Viewed 151k times

11 The python timedelta library should do what you need. A timedelta is returned when you subtract two datetime instances.

I have two different dates and I want to know the difference in days between them. The format of the date is YYYY-MM-DD. I have a function that can ADD or SUBTRACT a given number to a date: def

Jan 13, 2009 · I have a Python datetime.datetime object. What is the best way to subtract one day?

Aug 26, 2015 · When you subtract two datetime objects in python, you get a datetime.timedelta object. You can then get the total_seconds() for that timedelta object and check if that is greater than 3*3600 …

Feb 7, 2011 · Using range and len together in python is almost always a code smell, invariably there's a better way of doing things as in the numerous examples given above.

For python 3.4, first you'd need to convert the strings representing times into datetime objects, then the datetime module has helpful tools work with dates and times.