为什么 Python 在连接字符串时不进行类型转换?
问题描述
在 Python 中，以下代码会产生错误:
In Python, the following code produces an error:
a = 'abc'
b = 1
print(a + b)
(错误是TypeError: cannot concatenate 'str' and 'int' objects").
(The error is "TypeError: cannot concatenate 'str' and 'int' objects").
为什么 Python 解释器在遇到这些类型的串联时不会自动尝试使用 str() 函数?
Why does the Python interpreter not automatically try using the str() function when it encounters concatenation of these types?
解决方案
问题是转换有歧义，因为+表示字符串拼接和数字加法.以下问题同样有效:
The problem is that the conversion is ambiguous, because + means both string concatenation and numeric addition. The following question would be equally valid:
为什么 Python 解释器在遇到 addition 这些类型时不会自动尝试使用 int() 函数?
Why does the Python interpreter not automatically try using the int() function when it encounters addition of these types?
这正是不幸地困扰着 Javascript 的松散类型问题.
This is exactly the loose-typing problem that unfortunately afflicts Javascript.
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