python - 我的第一个程序

Question

我在 Code Academy 上了很多课，但我感到很沮丧，因为一些编译器会拒绝返回相同结果的答案。因此，我决定暂时脱离并使用我学到的工具(计算器)创建自己的程序。它无法正常运行。当它在菜单中时，if/elif/else 语句不起作用。该程序似乎忽略了输入。所以，这是我的第一个程序代码...

import math
user_choice=(">>")
def add():
    print "What two numbers would you like to add?"
    a= int(raw_input(user_choice))                     
    b= int(raw_input(user_choice))
    c= a + b
    print c
def sub():
    print "What two numbers would you like to subtract?"
    a=int(raw_input(user_choice))
    b=int(raw_input(user_choice))
    c=a-b
    print c
def mult():
    print "What two numbers would you like to multiply?"
    a=int(raw_input(user_choice))
    b=int(raw_input(user_choice))
    c= a*b
    print c
def div():
    print "What two numbers would you like to divide?"
    a=int(raw_input(user_choice))
    b=int(raw_input(user_choice))
    c=a/b
    print c
def exp():
    print "What number would you like to power?"
    a=int(raw_input(user_choice))
    print "By what number would you like it to be powered to?"
    b=int(raw_input(user_choice))
    c= math.pow(a,b)
    print  c
def square():
    print "What number would you like to square root?"
    a=int(raw_input(user_choice))
    b=math.sqrt(a)
    print b

print "+---------------------------+"   
print "|   Welcome to my basic     |"
print "|    calculator!         |"
print "|                           |"
print "|What would you like to do? |"
print "|                |"
print "|1: Addition         |"
print "|2: Subtraction          |"
print "|3: Multiplication       |"
print "|4: Division         |"
print "|5: Exponents            |"
print "|6: Square Root          |"
print "|7: Quit         |"
print "|                           |"
print "+---------------------------+"

if int(raw_input(user_choice)) ==  "1":
     add()

elif int(raw_input(user_choice)) == "2":
     sub()

elif int(raw_input(user_choice)) == "3":
     mult()

elif int(raw_input(user_choice)) == "4":
     div()

elif int(raw_input(user_choice)) == "5":
     exp()

elif int(raw_input(user_choice)) == "6":
     square()

elif int(raw_input(user_choice)) == "7":
     exit()

else:
    print "Sorry, I didn't understand your entry.Try entering a value 1-7"

还没有“if error”代码，但我只是坚持让它工作。所有的功能都有效。只是无法使选项起作用。

Answer 1

int(rawinput()) 将返回一个整数，它不会是== 到像"1 这样的字符串“。从它们中删除 int()，它应该可以工作。