round() function in python is used to round a floating number to the specified number of decimal places.
The general syntax for the round() function is
1 | round(number, ndigits) |
round() Parameters
| Parameter | Condition | Description |
| number | Required | Number to round |
| ndigits | Optional | Number of decimal digits to round to. Default is None. |
If ndigits is not provided then the number is rounded to the nearest integer.
Let’s see some examples.
Example: Round numbers in Python using round()
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | number = 4.658 print(round(number,2)) # output 4.66 number = 4.658 print(round(number,1)) # output 4.7 number = 4.658 print(round(number)) # output 5 number = 3.608 print(round(number,2)) # output 3.61 number = 3.608 print(round(number,1)) # output 3.6 |
Round To Ten’s or Hundred’s
We can also specify a negative value for ndigits. In this case, the number gets rounded to ten’s or hundreds.
Let’s see some examples of the same.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | number = 41 print(round(number,-1)) # output 40 number = 46 print(round(number,-1)) # output 50 number = 52 print(round(number,-1)) # output 50 number = 98 print(round(number,-2)) # output 100 number = 105 print(round(number,-2)) # output 100 |
Rounding Up or Down
If you want to round number explicitly up or down then use ceil() or floor() function of python’s math module.
1 2 3 4 5 | import math # Round a number up x = math.ceil(4.2) print(x) |
output
1 | 5 |
1 2 3 4 5 | import math # Round a number up x = math.floor(4.2) print(x) |
output
1 | 4 |
If Hope now rounding number in python would be easy for you. If you have any suggestions or doubts then comment below.