"不可排序的类型：int（）< str（）”； [英] "Unorderable types: int() < str()"

问题描述

我正在尝试使用Python制作退休计算器。语法没有错，但是当我运行以下程序时：

I'm trying to make a retirement calculator right now on Python. There's nothing wrong with the syntax but when I run the following program:

def main():
    print("Let me Retire Financial Calculator")
    deposit = input("Please input annual deposit in dollars: $")
    rate = input ("Please input annual rate in percentage: %")
    time = input("How many years until retirement?")
    x = 0
    value = 0
    while (x < time):
        x = x + 1
        value = (value * rate) + deposit
        print("The value of your account after" +str(time) + "years will be $" + str(value))

它告诉我：

Traceback (most recent call last):
  File "/Users/myname/Documents/Let Me Retire.py", line 8, in <module>
    while (x < time):
TypeError: unorderable types: int() < str()

有什么想法可以解决吗？

Any ideas how I could solve this?

推荐答案

这里的问题是 input（）在Python 3.x中返回一个字符串，因此当您执行比较中，您正在比较一个字符串和一个定义不明确的整数（如果字符串是一个单词，如何比较一个字符串和一个数字？）-在这种情况下，Python不会猜测，它会抛出一个错误。

The issue here is that input() returns a string in Python 3.x, so when you do your comparison, you are comparing a string and an integer, which isn't well defined (what if the string is a word, how does one compare a string and a number?) - in this case Python doesn't guess, it throws an error.

要解决此问题，只需调用 int（） 将您的字符串转换为整数：

To fix this, simply call int() to convert your string to an integer:

int(input(...))

作为注释，如果您要处理十进制数字，您将要使用 float（） 或 decimal.Decimal（） （取决于您的准确性和速度需求）。

As a note, if you want to deal with decimal numbers, you will want to use one of float() or decimal.Decimal() (depending on your accuracy and speed needs).

请注意，更Python化的方式是遍历一系列数字（而不是 while 循环和计数）将使用 range（）。例如：

Note that the more pythonic way of looping over a series of numbers (as opposed to a while loop and counting) is to use range(). For example:

def main():
    print("Let me Retire Financial Calculator")
    deposit = float(input("Please input annual deposit in dollars: $"))
    rate = int(input ("Please input annual rate in percentage: %")) / 100
    time = int(input("How many years until retirement?"))
    value = 0
    for x in range(1, time+1):
        value = (value * rate) + deposit
        print("The value of your account after" + str(x) + "years will be $" + str(value))

这篇关于"不可排序的类型：int（）< str（）”；的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！