# coding=utf-8

import math

# 把函数作为参数

def add(x, y, f):

    return f(x) + f(y)

# list 遍历执行函数

def format_name(s):

    return s[0].upper() + s[1:].lower()

# list求积

def prod(x, y):

    return x * y

# 过滤函数

def is_sqr(x):

    r = int(math.sqrt(x))

    return r*r == x

# 自定义排序

def cmp_ignore_case(s1, s2):

    u1 = s1.upper()

    u2 = s2.upper()

    if u1 < u2:

        return -1

    elif u1 > u2:

        return 1

    else:

        return 0

# 返回函数

def calc_prod(lst):

    def lazy_prod():

        def f(x, y):

            return x * y

        return reduce(f, lst, 1)

    return lazy_prod

# 闭包

def count():

    fs = []

    for i in range(1, 4):

        def f(j):

            def g():

                return j*j

            return g

        r = f(i)

        fs.append(r)

    return fs

# 匿名函数

# b = lambda x: x * x

def fff(x):

    return x * x

# 装饰器

import time

def performance(f):

    def fn(*args, **kw):

        t1 = time.time()

        r = f(*args, **kw)

        t2 = time.time()

        print ‘call %s() in %fs‘ % (f.__name__, (t2 - t1))

        return r

    return fn

@performance

def factorial(n):

    return reduce(lambda x, y: x*y, range(1, n+1))

if __name__ == "__main__":

    a = add(25, 9, math.sqrt)

    m = map(format_name, [‘adam‘, ‘LISA‘, ‘barT‘])

    r = reduce(prod, [2, 4, 5, 7, 12])

    f = filter(is_sqr, range(1, 101))

    s = sorted([‘bob‘, ‘about‘, ‘Zoo‘, ‘Credit‘], cmp_ignore_case)

    c = calc_prod([1, 2, 3, 4])

    f1, f2, f3 = count()

    fa = factorial(10)

    print fa

python 笔记