Which function would you use to round a number in Python?

To round a number in Python, the most appropriate function to use is the round() function. This function takes a floating-point number as an argument and returns the nearest integer. If the fractional part of the number is exactly 0.5, round() will round to the nearest even number, which is known as "bankers' rounding."

For instance, using round(3.5) will yield 4, while round(2.5) will yield 2. This behavior makes the round() function particularly useful when precise rounding is necessary in calculations.

The other functions provided handle different operations: ceil() rounds a number up to the nearest whole number, floor() rounds it down to the nearest whole number, and abs() returns the absolute value of a number. None of these functions provide the same functionality as round(), confirming that round() is indeed the correct choice for rounding numbers.