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EX.When True is actually False

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暮晨 2018-11-18 19:22:09 +08:00 committed by 暮晨
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@ -45,7 +45,7 @@ So, here we go...
- [> yielding None/生成 None](#-yielding-none生成-none) - [> yielding None/生成 None](#-yielding-none生成-none)
- [> Mutating the immutable!/强人所难](#-mutating-the-immutable强人所难) - [> Mutating the immutable!/强人所难](#-mutating-the-immutable强人所难)
- [> The disappearing variable from outer scope/消失的外部变量](#-the-disappearing-variable-from-outer-scope消失的外部变量) - [> The disappearing variable from outer scope/消失的外部变量](#-the-disappearing-variable-from-outer-scope消失的外部变量)
- [> When True is actually False](#-when-true-is-actually-false) - [> When True is actually False/真亦假](#-when-true-is-actually-false真亦假)
- [> From filled to None in one instruction...](#-from-filled-to-none-in-one-instruction) - [> From filled to None in one instruction...](#-from-filled-to-none-in-one-instruction)
- [> Subclass relationships *](#-subclass-relationships-) - [> Subclass relationships *](#-subclass-relationships-)
- [> The mysterious key type conversion *](#-the-mysterious-key-type-conversion-) - [> The mysterious key type conversion *](#-the-mysterious-key-type-conversion-)
@ -1048,7 +1048,7 @@ NameError: name 'e' is not defined
--- ---
### > When True is actually False ### > When True is actually False/真亦假
```py ```py
True = False True = False
@ -1061,10 +1061,10 @@ if True == False:
I've lost faith in truth! I've lost faith in truth!
``` ```
#### 💡 Explanation: #### 💡 说明:
- Initially, Python used to have no `bool` type (people used 0 for false and non-zero value like 1 for true). Then they added `True`, `False`, and a `bool` type, but, for backward compatibility, they couldn't make `True` and `False` constants- they just were built-in variables. - 最初, Python 并没有 `bool` 型 (人们用0表示假值, 用非零值比如1作为真值). 后来他们添加了 `True`, `False`, 和 `bool` 型, 但是, 为了向后兼容, 他们没法把 `True` 和 `False` 设置为常量, 只是设置成了内置变量.
- Python 3 was backward-incompatible, so it was now finally possible to fix that, and so this example won't work with Python 3.x! - Python 3 由于不再需要向后兼容, 终于可以修复这个问题了, 所以这个例子无法在 Python 3.x 中执行!
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