我的小示例应用程序的输出如下：

Welcome to the Calculator!

Please choose what you'd like to do:

0: Addition

1: Subtraction

2: Multiplication

3: Division

4: Quit Application

0

Enter your first number: 1

Enter your second number: 1

Your result is:

11

这是因为addition()方法将input()作为字符串而不是数字。如何将它们用作数字？

这是我的整个剧本：

def addition(a, b):

return a + b

def subtraction(a, b):

return a - b

def multiplication(a, b):

return a * b

def division(a, b):

return a / b

keepProgramRunning = True

print"Welcome to the Calculator!"

while keepProgramRunning:

print"Please choose what you'd like to do:"

print"0: Addition"

print"1: Subtraction"

print"2: Multiplication"

print"3: Division"

print"4: Quit Application"

#Capture the menu choice.

choice = raw_input()

if choice =="0":

numberA = raw_input("Enter your first number:")

numberB = raw_input("Enter your second number:")

print"Your result is:"

print addition(numberA, numberB)

elif choice =="1":

numberA = raw_input("Enter your first number:")

numberB = raw_input("Enter your second number:")

print"Your result is:"

print subtraction(numberA, numberB)

elif choice =="2":

numberA = raw_input("Enter your first number:")

numberB = raw_input("Enter your second number:")

print"Your result is:"

print multiplication(numberA, numberB)

elif choice =="3":

numberA = raw_input("Enter your first number:")

numberB = raw_input("Enter your second number:")

print"Your result is:"

print division(numberA, numberB)

elif choice =="4":

print"Bye!"

keepProgramRunning = False

else:

print"Please choose a valid option."

print"

"

我已经说过系统发布了两次问题，检查发布时间。不是我的错，我也不能删除这个问题。

你没有close链接吗？

但这并不能立即解决问题。

python的可能副本-将字符串解析为float或int

因为您编写的计算器可能也接受浮动(1.5, 0.03)，所以更健壮的方法是使用这个简单的助手函数：

def convertStr(s):

"""Convert string to either int or float."""

try:

ret = int(s)

except ValueError:

#Try float.

ret = float(s)

return ret

这样，如果int转换不起作用，您将得到一个float返回。

编辑：如果您不完全了解python 2.x如何处理整数除法，那么您的division函数也可能导致一些悲伤的面孔。

简而言之，如果你想让10/2等于2.5而不是2，你就需要做from __future__ import division，或者让其中一个或两个论点浮动，就像这样：

def division(a, b):

return float(a) / float(b)

嘿，这很干净，谢谢！

convertStr = float的工作原理几乎相同。

>>> a ="123"

>>> int(a)

123

以下是一些免费代码：

def getTwoNumbers():

numberA = raw_input("Enter your first number:")

numberB = raw_input("Enter your second number:")

return int(numberA), int(numberB)

更多内置函数：docs.python.org/library/functions.html

从主函数调用子函数时，可以将变量转换为int，然后调用。请参考以下代码：

import sys

print("Welcome to Calculator

")

print("Please find the options:

" +"1. Addition

" +"2. Subtraction

" +

"3. Multiplication

" +"4. Division

" +"5. Exponential

" +"6. Quit

")

def calculator():

choice = input("Enter choice

")

if int(choice) == 1:

a = input("Enter first number

")

b = input("Enter second number

")

add(int(a), int(b))

if int(choice) == 2:

a = input("Enter first number

")

b = input("Enter second number

")

diff(int(a), int(b))

if int(choice) == 3:

a = input("Enter first number

")

b = input("Enter second number

")

mult(int(a), int(b))

if int(choice) == 4:

a = input("Enter first number

")

b = input("Enter second number

")

div(float(a), float(b))

if int(choice) == 5:

a = input("Enter the base number

")

b = input("Enter the exponential

")

exp(int(a), int(b))

if int(choice) == 6:

print("Bye")

sys.exit(0)

def add(a, b):

c = a+b

print("Sum of {} and {} is {}".format(a, b, c))

def diff(a,b):

c = a-b

print("Difference between {} and {} is {}".format(a, b, c))

def mult(a, b):

c = a*b

print("The Product of {} and {} is {}".format(a, b, c))

def div(a, b):

c = a/b

print("The Quotient of {} and {} is {}".format(a, b, c))

def exp(a, b):

c = a**b

print("The result of {} to the power of {} is {}".format(a, b, c))

calculator()

我在这里做的是在将输入的参数转换为int时调用每个函数，希望这有帮助。

在您的情况下，可以这样更改：

if choice =="0":

numberA = raw_input("Enter your first number:")

numberB = raw_input("Enter your second number:")

print"Your result is:"

print addition(int(numberA), int(numberB))

添加DEF(A、B)：返回A+B

定义减法(a，b)：返回-B

DEF倍增(A、B)：返回A*B

DEF部门(A、B)：返回A/B

keepProgramrunning=真

打印"欢迎使用计算器！"

保持编程运行时：打印"请选择要执行的操作："

print"0: Addition"

print"1: Subtraction"

print"2: Multiplication"

print"3: Division"

print"4: Quit Application"

#Capture the menu choice.

choice = raw_input()

if choice =="0":

numberA = input("Enter your first number:")

numberB = input("Enter your second number:")

print"Your result is:" + str(addition(numberA, numberB)) +"

"

elif choice =="1":

numberA = input("Enter your first number:")

numberB = input("Enter your second number:")

print"Your result is:" + str(subtraction(numberA, numberB)) +"

"

elif choice =="2":

numberA = input("Enter your first number:")

numberB = input("Enter your second number:")

print"Your result is:" + str(multiplication(numberA, numberB)) +"

"

elif choice =="3":

numberA = input("Enter your first number:")

numberB = input("Enter your second number:")

print"Your result is:" + str(division(numberA, numberB)) +"

"

elif choice =="4":

print"Bye!"

keepProgramRunning = False

else:

print"Please choose a valid option."

print"

"

解释一下怎么样？

容易的！

if option == str(1):

numberA = int(raw_input("enter first number."))

numberB= int(raw_input("enter second number."))

print""

print addition(numberA, numberB)

etc etc etc

也许下面，那么您的计算器就可以使用任意的基数(例如十六进制、二进制、基数7！)等)：(未测试)

def convert(str):

try:

base = 10  # default

if ':' in str:

sstr = str.split(':')

base, str = int(sstr[0]), sstr[1]

val = int(str, base)

except ValueError:

val = None

return val

val = convert(raw_input("Enter value:"))

# 10     : Decimal

# 16:a   : Hex, 10

# 2:1010 : Binary, 10

def addition(a, b): return a + b

def subtraction(a, b): return a - b

def multiplication(a, b): return a * b

def division(a, b): return a / b

keepProgramRunning = True

print"Welcome to the Calculator!"

while keepProgramRunning:

print"Please choose what you'd like to do:"