Python’s built-in round() turns a calculated number into a rounded value. With no additional precision, it is used to obtain a whole-number result. section 6.4
Rounding is especially useful after calculations with decimal values. Floating-point numbers can be stored as close approximations, so a result expected to be 3 might appear as 2.9999999999999893. Applying round() removes this distracting precision error for the final integer result. section 6.4
Converting decimal hours into minutes
minutes_decimal = hours_decimal - hours_part minutes_part = round(minutes_decimal * 60) If hours_decimal is 2.05 and hours_part is 2, minutes_decimal is 0.05. Multiplying by 60 produces approximately 3, and round() stores the useful whole-minute result as 3. section 6.4
Do not confuse rounding with int(). Converting 3.94 with int() truncates the decimal part and produces 3; round() is chosen when the nearest whole-number result is wanted. section 5.3 section 6.4
minutes_part = round(minutes_decimal * 60)
See the compact calculation that multiplies the decimal part by 60 and rounds the result. section 6.4
