“带有基数10的int（）的无效文字："这究竟意味着什么？ [英] "invalid literal for int() with base 10:" What does this actually mean?

问题描述

初学者在这里！我正在编写一个简单的代码来计算项目在列表中显示的次数（例如 count（[1,3,1,4,1,5]，1）将返回3）。

Beginner here! I am writing a simple code to count how many times an item shows up in a list (ex. count([1, 3, 1, 4, 1, 5], 1) would return 3).

这是我原来的：

def count(sequence, item):
    s = 0
    for i in sequence:
       if int(i) == int(item):
           s += 1
    return s

每次我提交此代码时，我都会

Every time I submitted this code, I got

基数为10的int（）的文字无效：

"invalid literal for int() with base 10:"

我已经发现了正确的代码是：

I've since figured out that the correct code is:

def count(sequence, item):
    s = 0
    for i in sequence:
       if **i == item**:
           s += 1
    return s

但是，我只是对这个错误陈述的含义感到好奇。为什么我不能留在 int（）？

However, I'm just curious as to what that error statement means. Why can't I just leave in int()?

推荐答案

错误是基于10的int（）的无效文字：。这只是意味着您传递给 int 的参数看起来不像数字。换句话说，它是空的，或者除了数字之外还有一个字符。

The error is "invalid literal for int() with base 10:". This just means that the argument that you passed to int doesn't look like a number. In other words it's either empty, or has a character in it other than a digit.

这可以在python shell中重现。

This can be reproduced in a python shell.

>>> int("x")
ValueError: invalid literal for int() with base 10: 'x'

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