Python - round up to the nearest ten [duplicate]

问题

This question already has answers here:

Python round up integer to next hundred (8 answers)

How to round integers in python (7 answers)

Closed 5 years ago.

If I get the number 46 and I want to round up to the nearest ten. How do can I do this in python?

46 goes to 50.

回答1:

You can use math.ceil() to round up, and then multiply by 10

import math

def roundup(x):
    return int(math.ceil(x / 10.0)) * 10

To use just do

>>roundup(45)
50

回答2:

round does take negative ndigits parameter!

>>> round(46,-1)
50

may solve your case.

回答3:

Here is one way to do it:

>>> n = 46
>>> (n + 9) // 10 * 10
50

回答4:

This will round down correctly as well:

>>> n = 46
>>> rem = n % 10
>>> if rem < 5:
...     n = int(n / 10) * 10
... else:
...     n = int((n + 10) / 10) * 10
...
>>> 50

来源：https://stackoverflow.com/questions/26454649/python-round-up-to-the-nearest-ten