round a number to the nearest thousandth in python

To round a number to the nearest thousandth in Python, you can use the round() function from the math module. Here's an example:

main.py
import math

num = 3.14159265
rounded_num = round(num, 3)
print(rounded_num)
77 chars
6 lines

In this example, we import the math module, assign a floating-point number to the variable num, and then call the round() function to round num to the nearest thousandth (i.e., 3 decimal places). The resulting rounded number is assigned to the variable rounded_num, which is then printed to the console.

Output:

main.py
3.142
6 chars
2 lines

Note that when working with floating-point numbers in Python, rounding errors can occur due to the way that floating-point numbers are represented in memory. As a result, you may occasionally encounter unexpected results when rounding numbers. To minimize the risk of rounding errors, you can use the decimal module or work with integers instead of floating-point numbers where possible.