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SpikeXy

            Action<int> printRoot = delegate(int number)
            {
                Console.WriteLine(Math.Sqrt(number));
            };
            
            
            
                     Action<IList<double>> printMean = delegate(IList<double> numbers)
            {
                double total = 0;

SpikeXy

# try_except_else_finally 例子，如果没有错误发生，可以在except语句块后面加一个else，当没有错误发生时，会自动执行else语句：

try:
    print('try...')
    r = 10 / int('2')
    print('result:', r)
except ValueError as e:
    print('ValueError:', e)
except ZeroDivisionError as e:
    print('ZeroDivisionError:', e)

SpikeXy

>>> class Student(object):
...     def __init__(self, name):
...         self.name = name
...     def __str__(self):
...         return 'Student object (name: %s)' % self.name
...
>>> print(Student('Michael'))
Student object (name: Michael)

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class Student(object):

    @property
    def birth(self):
        return self._birth

    @birth.setter
    def birth(self, value):
        self._birth = value

SpikeXy

class Student(object):

    def get_score(self):
         return self._score

    def set_score(self, value):
        if not isinstance(value, int):
            raise ValueError('score must be an integer!')
        if value < 0 or value > 100:
            raise ValueError('score must between 0 ~ 100!')

SpikeXy

# 使用functools.partial创建新的函数 
>>> import functools
>>> int2 = functools.partial(int, base=2)
>>> int2('1000000')
64
>>> int2('1010101')
85

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>>> sorted([36, 5, -12, 9, -21])
[-21, -12, 5, 9, 36]

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>>> from functools import reduce
>>> def add(x, y):
...     return x + y
...
>>> reduce(add, [1, 3, 5, 7, 9])
25

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//Iterator是惰性序列，因此通过list()函数让它把整个序列都计算出来并返回一个list
# list、dict、str等数据类型不是Iterator ，需要用iter()函数转换一下；可作用于for循环的对象都是Iterable类型；可作用于next()函数的对象都是Iterator类型；