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Using the Python round Function

Reading time 1 min
Published Feb 13, 2020
Updated Feb 13, 2020

TL;DR – The built-in Python round function allows you to round numbers.

How to round in Python

The Python round function rounds a floating point number to a specified amount of decimals:

Example
number = round(37.8452950483520, 4)
print(number)

number2 = round(37.8452950483520, 2)
print(number2)

number3 = round(37.8452950483520)
print(number3)

You can also use Python round for negative numbers:

Example
number = round(-14.573883749392, 4)
print(number)

number2 = round(-14.573883749392, 2)
print(number2)

number3 = round(-14.573883749392)
print(number3)

The syntax for round in Python

The Python round function takes up to two arguments:

  • A floating point number to round
  • A number of decimals to round the number to

The second argument is optional: if you skip it, the number will be rounded to the nearest integer (no decimals). If using both, you have to separate the arguments with a comma:

round(float, decimals)

Python round: useful tips

  • Make sure you define both arguments for rounding in Python in numbers – otherwise, a TypeError will fire.
  • In some cases, you might get inconsistent results for example, 2.75 is rounded to 2.8, but 2.65 is rounded to 2.6. It's not a bug: the system simply cannot represent some decimal fractions exactly as floats.