对温度进行转换的代码，个人觉得很经典：
class Temperature(object):
coefficients = {'c': (1.0, 0.0, -273.15), 'f': (1.8, -273.15, 32.0),
'r': (1.8, 0.0, 0.0)}
def _ _init_ _(self, **kwargs):
# default to absolute (Kelvin) 0, but allow one named argument,
# with name being k, c, f or r, to use any of the scales
try:
name, value = kwargs.popitem( )
except KeyError:
# no arguments, so default to k=0
name, value = 'k', 0
# error if there are more arguments, or the arg's name is unknown
if kwargs or name not in 'kcfr':
kwargs[name] = value # put it back for diagnosis
raise TypeError, 'invalid arguments %r' % kwargs
setattr(self, name, float(value))
def _ _getattr_ _(self, name):
# maps getting of c, f, r, to computation from k
try:
eq = self.coefficients[name]
except KeyError:
# unknown name, give error message
raise AttributeError, name
return (self.k + eq[1]) * eq[0] + eq[2]
def _ _setattr_ _(self, name, value):
# maps settings of k, c, f, r, to setting of k; forbids others
if name in self.coefficients:
# name is c, f or r -- compute and set k
eq = self.coefficients[name]
self.k = (value - eq[2]) / eq[0] - eq[1]
elif name == 'k':
# name is k, just set it
object._ _setattr_ _(self, name, value)
else:
# unknown name, give error message
raise AttributeError, name
def _ _str_ _(self):
# readable, concise representation as string
return "%s K" % self.k
def _ _repr_ _(self):
# detailed, precise representation as string
return "Temperature(k=%r)" % self.k
程序员世界里有哪些名言警句呢？Jun Auza 列出了一些启迪人心的至理名言，它们大多来自产业界富于经验的人们。 10. “People think that computer science is the art of geniuses but the actual reality is the opposite, just many people doing things that build on each other, like a wall of mini stones.”- Donald Knuth 6. “The trouble with programmers is that you can never tell what a programmer is doing until it’s too late.”- Seymour Cray 5. “To iterate is human, to recurse divine.”- L. Peter Deutsch 4. “On two occasions I have been asked [by members of Parliament]: ‘Pray， Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?’ I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question.”- Charles Babbage 3. “Most good programmers do programming not because they expect to get paid or get adulation by the public, but because it is fun to program.”- Linus Torvalds 2. “Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live.”- Martin Golding 1. “There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies.”- C.A.R. Hoare 感谢JavaPy
下文列出前10个供读者欣赏：
10. “人们认为计算机科学是天才的艺术，但事实完全相反：只是很多人在共同建立起来的事物之上工作，就像一条由小石头铺成的小径。”—— Donald Knuth
9. “First learn computer science and all the theory. Next develop a programming style. Then forget all that and just hack.”- George Carrette
9. “首先学会计算机科学和所有的理论。然后发展出一个编程风格。之后便要忘掉所有这些，以自由的方式探索。”—— George Carrette
8. “Most of you are familiar with the virtues of a programmer. There are three, of course: laziness, impatience, and hubris.”- Larry Wall
8. “大多数的你们都熟悉程序员的美德。它们有三点：懒，不耐烦，以及狂妄自大。”—— Larry Wall
7. “Most software today is very much like an Egyptian pyramid with millions of bricks piled on top of each other,with no structural integrity， but just done by brute force and thousands of slaves.”- Alan Kay
7. “今日的大多数软件很像埃及金字塔，由千百万砖头堆砌起来，层层相切，没有着整体的结构，是由畜力和成千上万奴隶的力量建立起来的。”—— Alan Kay
6. “程序员的问题是，不到太晚，你永远无法知道一个他在做着些什么。”—— Seymour Cray
5. “人理解迭代，神理解递归。”—— Peter Deutsch
4. “有两次我被(国会议员)问道：‘ Mr. Babbage，如果你输入计算机错误的数据，正确的答案会出来吗?’我完全无法理解能产生此种问题的大脑的混乱。”
3. “大部分好的程序员编程并不是为了钱或名望，而只是因为纯粹的乐趣。”—— Linus Torvalds
2. “编程的时候，总是想着那个维护你代码的人会是一个知道你住在哪儿的有暴力倾向的精神病患者。”—— Martin Golding
1. “有两种生成一个软件设计方案的途径。一个是把它做得如此简单，以致于明显不会有漏洞存在。另一个是把它做的如此复杂，以致于不会有明显的漏洞存在。” —— C.A.R. Hoare
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