Python round() usage and examples

Python built-in functions

The round() function returns a floating-point number rounded to the specified decimal place.

The syntax of round() is:

round(number, ndigits)

round() parameters

round() function has two parameters:

• number -The number to be rounded

• ndigits (optional) -The number rounded to the given number; default is 0

round() return value

• If ndigits is not provided, round() returns the nearest integer to the given number.

• If ndigit is given, round() returns the number rounded to ndigit.

Example1: How does round() work in Python?

#　Number is an integer
print(round(10))
#　Number is a floating-point number
print(round(10.7))
#　Number is a floating-point number
print(round(5.5))

Output result

10
11
6

Example2: Round a number to a specified decimal place

print(round(2.665,　2))
print(round(2.675,　2))

Output result

2.67
2.67

In the program, you may think2.675It should be rounded to2.68This is not a bug. It is considered a standard rounding method.

Python built-in functions