CODEWITHSUNDEEP
pythonrounding
Jonas Palačionis
Jonas Palačionis

Reputation: 4842

Always round up a number to a bigger side

I am new to Python and I'm trying to round up a number to 10000 scale.

For example:

a = 154795
b = a / 10000 # 15.4795
c = round(b) # 15

I want to round c to 16, even if b = 15.0001, or round a to 160000 before passing it to b.

How would I be able to achieve this?

Thank you for your suggestions.

Upvotes: 1

Views: 1152

Answers (4)

Useless
Useless

Reputation: 67743

The standard integer arithmetic way to round up a positive integer N divided by D (emphasis on up, and positive) is

(N + D - 1) // D

The new numerator term is the largest value that won't roll over to the next multiple of the divisor D, which means we can use integral floor division. For example

def nquot(n, d):
    # next quotient (I couldn't think of a better name)
    return (n + d - 1) // d

>>> nquot(150000, 10000)
15
>>> nquot(150001, 10000)
16

It's often easier to allow the conversion to floating-point and do the rounding there, as with math.ceil in the other answers.

PS. your digit grouping is weird. Both a,bbb,ccc and a.bbb.ccc are familiar, but a.bbbc is not.

Upvotes: 2

Chris Doyle
Chris Doyle

Reputation: 12002

you should use the ceil function from the math module in python

math.ceil() function returns the smallest integral value greater than the number. If number is already integer, same number is returned.

from math import ceil
a = 154795
b = a / 10000 # 15,4795
c = ceil(b) # 16
print(c)

Upvotes: 2

Celius Stingher
Celius Stingher

Reputation: 18367

You can use math's function ceil. Here is an example:

import math
a = 150001
b = a / 10000
print(math.ceil(b))

Output:

16

Of course if you want the variable to be stored then you can use:

import math
a = 15001
b = math.ceil(a / 1000)
print(b)

For the same output:

16

Upvotes: 4

Tim Christy
Tim Christy

Reputation: 78

What @Dschoni said. 

import numpy as np

a = 154795
b = a / 10000 # 15,4795
c = np.ceil(b) # always rounds up. Gives 16 here

Upvotes: 1

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