In this Python tutorial, you will learn about the syntax and usage of Python round() function with example programs on how to use to round a floating point number.

Python round()

Python round() function rounds of a floating point number to specific number of decimal points.

ADVERTISEMENT

Syntax

Following is the syntax of round() function.

round(number, precision)

where number is the floating point number with decimal part. precision specify the number of decimal digits the number has to round of.

round() function returns a rounded value of number with precision number of decimal places.

precision is optional. The default value of precision is zero. If no precision is specified, then round(number) will become round(number, 0).

Python round() function

Examples

1. round() of a float number

In this example, we will initialize a variable pi with a floating value and then round of its value to five decimal points.

Python Program

pi = 3.141592653589793238
pi_r = round(pi, 5)
print(pi_r)
Try Online

Output

3.14159

In the following example, we compute rounded value of different floating point values.

Python Program

print(round(1.234, 2))
print(round(1.235, 2))
print(round(1.236, 2))
print(round(1.234999, 2))
Try Online

Output

1.23
1.24
1.24
1.23
ADVERTISEMENT

2. range() – With no Precision

If we do not give precision argument to round() function, the round() function will consider the default value of precision, which is zero.

In this example, we will initialize a variable pi with a floating value and then round of its value to zero decimal points.

Python Program

pi = 3.141592653589793238
pi_r = round(pi)
print(pi_r)
Try Online

Output

3

Python round() Tutorials

Following are some of the examples, that cover the special cases of round() function.

Conclusion

Concluding this Python Tutorial, we learned about Python round() function, its syntax, and the different scenarios associated with it.