python tkinter 如何四舍五入到两位小数

Question

I'm making a small program that calculates a percentage, but I can't find the way to round the result to 2 decimals.

• There is a field for inputting a number
• There is another field for inputting a second number (or increase it by clicking the button)
• There is a field that shows the percent

I believe I need to use something like "{:.2f}" in the function, but I don't know where exactly

This is the part of my code where I reckon I have to put the command:

# Defining a function that takes any arguments and calulcates the proportion of the population and the vaccinated
def calculate(*args):
    try:
        popint = float(pop.get())
        vaccint = float(vacc.get())
        rate.set((vaccint / popint) * 100)
    except ValueError:
        pass  # Ignore for now

# Defining a function that increases by 1 the number of vaccinated
def addvacc(*args):
    try:
        vaccadd = int(vacc.get())
        vacc.set(vaccadd + 1)
        calculate()
    except ValueError:
        pass # Ignore for now

# Creating a window with title
root = Tk()

Everything is created already (buttons, labels, etc.), and it works.

I've attached the GUI of the program. Thank you.

Answer 1

Once you get the percentage, and when you do this:

round(<your percentage value>,2)  #syntax: round(Value, digits to be rounded off to)

I just took an arbitrary float value and executed:

round(75.678780,2)

Output: 75.68