Question

我正在创建一个乘法程序，这里是乘法的代码：

 def multiply():
    print('enter two numbers in this format (x, y)')
    mult = input()
    multy = list(mult)
    answer = multy[1] * multy[2]
    print(answer)

这是我的错误：

`Traceback (most recent call last):
  File "C:/Python34/math clac.py", line 36, in <module>
    multiply()
  File "C:/Python34/math clac.py", line 17, in multiply
    answr = multy[1] * multy[2]
IndexError: list index out of range`

我做错了什么？

Answer 1

试试这个：

def multiply():
    print('enter two numbers in this format (x, y)')
    mult = input()
    multy = list(mult)
    answer = multy[0] * multy[1]
    print(answer)

指数为0和1，而不是1和2

Answer 2

你也可以这样做

def multiply():
    print('enter two numbers in this format (x, y)')
    mult = input()
    multy = list(mult)

    #the second item in list will be space or either your delimeter
    #in python list index always start with 0, this follow the other programming language also
    answer = int(multy[0]) * int(multy[2])
    print(answer)


multiply()

输出

enter two numbers in this format (x, y)
1,2

2

enter two numbers in this format (x, y)
7,7

49

乘法的python错误

2 个答案: