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Tag: rounding

What’s the mathematical reason behind Python choosing to round integer division toward negative infinity?

I know Python // rounds towards negative infinity and in C++ / is truncating, rounding towards 0. And here’s what I know so far: But why Python // choose to round towards negative infinity? I didn’t find any resources explain that, but only find and hear people say vaguely: “for mathematics reasons”. For example, in Why is -1/2 evaluated to

Python: Round decimal places after seconds in timestamp

I have this series: Initially, I wanted to round to seconds by doing: However, I am trying to merge this dataset to another of higher frequency. So I’d like to round the decimal places of the timestamp instead. Example: 2021-06-15 16:23:04.388 would become 2021-06-15 16:23:04.380 How can I do this? to a timestamp? Answer If .388 should become .380 we

How can I turn off rounding in Spark?

I have a dataframe and I’m doing this: I want to get just the first four numbers after the dot, without rounding. When I cast to DecimalType, with .cast(DataTypes.createDecimalType(20,4) or even with round function, this number is rounded to 0.4220. The only way that I found without rounding is applying the function format_number(), but this function gives me a string,

Round to the next tens in Python

Is there a way to round always up to the next tens? E.g., 0.000000000003 shall become 0.1. 0.1244593249234 shall become 0.2 and 0.9x shall become 1. Negative numbers are not a thing here. Is there a built in or do I need to come up with something? Answer by multiplying the input f to 10, you will map it from

Fastest way to round random numbers in python

I want to generate random numbers up to certain precision, one at a time (so I am not looking for a vectorized solution). I found a method in this QnA on stackoverflow, and it gave me these benchmarks as promised. The method is definitely is almost twice as fast. Now, here’s what is puzzling me. Why is the above method

Check if the number is round, if not then round it

I have a little python project. Just for fun. There you can add when you want to shutdown your pc. At the beginning you can choose seconds/minutes/hours, and if you choose minutes than the input number* 60 will be in the “shutdown.exe /s /t …). (It’s only working with round numbers, even than 1.5*60 will be round at the end.)

How does Python babel round numbers?

I’m building a financial website with the Flask framework and I’m currently writing unit tests for it. I’m using the Babel package to format money amounts and I hit upon rather strange rounding behaviour. I would expect rounding to be up in case of a 5, or to at least be consistent. But look at this: Why is this so,

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