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2.2 Line 136: corrected to ">>> from math import gcd" for Python 3.9+ #225

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Merged
mancuoj merged 1 commit into from
Nov 3, 2026
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2.2 Line 136: corrected to ">>> from math import gcd" for Python 3.9+ #225

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2 changes: 1 addition & 1 deletion sicp/2/2.md
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Expand Up @@ -133,7 +133,7 @@ Python 中的列表（以及大多数其他编程语言中的序列）都是 **0
如上面的例子所示，我们的有理数实现没有把有理数化简成**最简分数**（lowest terms）。要弥补这个缺陷，可以修改 `rational` 的实现。如果我们有一个计算两个整数最大公约数的函数，就能在构造「对」之前，先把分子和分母化简。和许多好用的工具一样，这样的函数 Python 标准库里早就有了。

```py
>>> from fractions import gcd
>>> from math import gcd
>>> def rational(n, d):
g = gcd(n, d)
return (n//g, d//g)
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