The Zen of Python

最新推荐文章于 2024-12-20 17:41:06 发布

原创最新推荐文章于 2024-12-20 17:41:06 发布 · 447 阅读

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本文介绍了Python编程哲学的精髓——《Python之禅》，阐述了优美、明确、简单等原则，并提供了其源码及解读。

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参考 ：<a target=_blank href="http://blog.youkuaiyun.com/gzlaiyonghao/article/details/2151918">http://blog.youkuaiyun.com/gzlaiyonghao/article/details/2151918</a>

>>> import this
The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!

二翻译：Beautiful is better than ugly.优美胜于丑陋（Python 以编写优美的代码为目标）Explicit is better than implicit.明了胜于晦涩（优美的代码应当是明了的，命名规范，风格相似）Simple is better than complex.简洁胜于复杂（优美的代码应当是简洁的，不要有复杂的内部实现）Complex is better than complicated.复杂胜于凌乱（如果复杂不可避免，那代码间也不能有难懂的关系，要保持接口简洁）Flat is better than nested.扁平胜于嵌套（优美的代码应当是扁平的，不能有太多的嵌套）Sparse is better than dense.间隔胜于紧凑（优美的代码有适当的间隔，不要奢望一行代码解决问题）Readability counts.可读性很重要（优美的代码是可读的）Special cases aren't special enough to break the rules.即便假借特例的实用性之名，也不可违背这些规则（这些规则至高无上）Although practicality beats purity.尽管现实打败纯洁Errors should never pass silently.不要包容所有错误Unless explicitly silenced.除非你确定需要这样做（精准地捕获异常，不写 except:pass 风格的代码）In the face of ambiguity, refuse the temptation to guess.当存在多种可能，不要尝试去猜测There should be one-- and preferably only one --obvious way to do it.而是尽量找一种，最好是唯一一种明显的解决方案（如果不确定，就用穷举法）Although that way may not be obvious at first unless you're Dutch.虽然这并不容易，因为你不是 Python 之父（这里的 Dutch 是指 Guido ）Now is better than never.做也许好过不做Although never is often better than *right* now.但不假思索就动手还不如不做（动手之前要细思量）If the implementation is hard to explain, it's a bad idea.如果你无法向人描述你的方案，那肯定不是一个好方案If the implementation is easy to explain, it may be a good idea.反之亦然（方案测评标准）Namespaces are one honking great idea -- let's do more of those!命名空间是一种绝妙的理念，我们应当多加利用（倡导与号召）三

"import this"的源码：

#coding=utf-8

s = """Gur Mra bs Clguba, ol Gvz Crgref

Ornhgvshy vf orggre guna htyl.
Rkcyvpvg vf orggre guna vzcyvpvg.
Fvzcyr vf orggre guna pbzcyrk.
Pbzcyrk vf orggre guna pbzcyvpngrq.
Syng vf orggre guna arfgrq.
Fcnefr vf orggre guna qrafr.
Ernqnovyvgl pbhagf.
Fcrpvny pnfrf nera'g fcrpvny rabhtu gb oernx gur ehyrf.
Nygubhtu cenpgvpnyvgl orngf chevgl.
Reebef fubhyq arire cnff fvyragyl.
Hayrff rkcyvpvgyl fvyraprq.
Va gur snpr bs nzovthvgl, ershfr gur grzcgngvba gb thrff.
Gurer fubhyq or bar-- naq cersrenoyl bayl bar --boivbhf jnl gb qb vg.
Nygubhtu gung jnl znl abg or boivbhf ng svefg hayrff lbh'er Qhgpu.
Abj vf orggre guna arire.
Nygubhtu arire vf bsgra orggre guna *evtug* abj.
Vs gur vzcyrzragngvba vf uneq gb rkcynva, vg'f n onq vqrn.
Vs gur vzcyrzragngvba vf rnfl gb rkcynva, vg znl or n tbbq vqrn.
Anzrfcnprf ner bar ubaxvat terng vqrn -- yrg'f qb zber bs gubfr!
"""

d = {}
for c in (65,97):
        for i in range(26):
                d[chr(i+c)]=chr((i+13) % 26 +c)

print "".join([d.get(c,c) for c in s])

直接放到一个文件里面，运行便可以得到“The Zen of Python"。

四源码解释
大家可以看到上面的源码写的晦涩难懂，原本可以通过print直接得到的东西，结果绕了好大一圈。作者的本意应该是作为"The zen of python" 的反例来示范。

这段代码其实是将所有的字母通过ASSII码映射到另外一个字母,比如说"G"映射到“T"。并将所有的映射保存到字典d中，

print d:
{'A': 'N', 'C': 'P', 'B': 'O', 'E': 'R', 'D': 'Q', 'G': 'T', 'F': 'S', 'I': 'V', 'H': 'U', 'K': 'X', 'J': 'W', 'M': 'Z', 'L': 'Y', 'O': 'B', 'N': 'A', 'Q': 'D', 'P': 'C', 'S': 'F', 'R': 'E', 'U': 'H', 'T': 'G', 'W': 'J', 'V': 'I', 'Y': 'L', 'X': 'K', 'Z': 'M', 'a': 'n', 'c': 'p', 'b': 'o', 'e': 'r', 'd': 'q', 'g': 't', 'f': 's', 'i': 'v', 'h': 'u', 'k': 'x', 'j': 'w', 'm': 'z', 'l': 'y', 'o': 'b', 'n': 'a', 'q': 'd', 'p': 'c', 's': 'f', 'r': 'e', 'u': 'h', 't': 'g', 'w': 'j', 'v': 'i', 'y': 'l', 'x': 'k', 'z': 'm'}

然后打印的时候通过字典d的映射进行解码。

五

关于 The zen of python每一句话的例子可以在一下链接看到，很经典：

http://stackoverflow.com/questions/228181/the-zen-of-python