从模块导入Python 3，5/2会给出2而不是2.5

Question

我在python 3中制作了一个计算器程序，我已经将程序分成了模块。我在一个模块中做了一个减法函数，它只取两个数字，并与正规/运算符除以。然而，它的作用似乎是/来自python 2，而5/2给我的是2而不是2.5。然而，我试着制作一个新的文件，它所做的只是打印(5/2)，这给了我2.5。我试着重新安装python，但没有结果。我有最新版本(3.4.3)。我是搞砸了还是这是个虫子？

计算器：

import operation
import formula
import time
print("\n")
run = True
while run:
try:
    print("1: Addittion")
    print("2: Subtraction")
    print("3: Multiplication")
    print("4: Division")
    print("5: Advanced")
    print("6: Quit")
    print("\n")

    choice = int(input("What would you like to do? "))
    print("\n")

    if choice == 1:
        operation.add()

    elif choice == 2:
        operation.subtract()

    elif choice == 3:
        operation.multiply()

    elif choice == 4:
        operation.divide()

        try:
            answer = numberA / numberB

        except ZeroDivisionError:
            print("ERROR: DIVIDE BY ZERO")
            print("\n")

        else:
            print("%d / %d = %d" % (numberA, numberB, answer))
            print("\n")

    elif choice == 5:
        print("1: Arithmetic Sequences")
        print("2: Geometric Sequences")
        print("3: Pythagorean Theorem")
        print("4: Median")
        print("5: Go Back")
        print("\n")

        choice = int(input("What would you like to do? "))
        print("\n")

        if choice == 1:
            formula.arithmetic()

        elif choice == 2:
            formula.geometric()

        elif choice == 3:
            formula.pythagorean()

        elif choice == 4:
            operation.median()

        elif choice == 5:
            pass

        else:
            print("ERROR: PLEASE ENTER A VALID OPTION (1-5)")
            print("\n")

    elif choice == 6:
        pass
        time.sleep(3)
        run = False

    else:
        print("ERROR: PLEASE ENTER A VALID OPTION (1-6)")
        print("\n")

except ValueError:
    print("\n")
    print("ERROR: PLEASE ONLY USE NUMBERS")
    print("\n")

模块：

def divide():
numberA = int(input("What is the dividend? "))
numberB = int(input("What is the divisor? "))
print("\n")

try:
    answer = numberA / numberB

except ZeroDivisionError:
    print("ERROR: DIVIDE BY ZERO")
    print("\n")

else:
    print("%d / %d = %d" % (numberA, numberB, answer))
    print("\n")

注意:这个模块实际上还有其他方程(-，x和+)，但我没有包括它们，因为我认为您不需要它们。如果你想看他们，告诉我

Answer 1

使用整数说明符格式化。试一试这个方法。

print('{} / {} = {}'.format(numberA, numberB, answer))