python进阶_技术问答

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python进阶

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破狼

class Rational(object):
def __init__(self, p, q):
self.p = p
self.q = q

def __int__(self):
return self.p // self.q

def __float__(self):
return (self.p / float(self.q))

print float(Rational(7, 2))
print float(Rational(1, 3))

0 6-6 python中类型转换

2015-03-23

jackanapes

import time
def performance(f):
def fn(*args, **kw):
t1 = time.time()
t2 = time.time()
print 'call %s() in %fs' % (f.__name__, (t2 - t1))
return f(*args, **kw)
return fn

0 2-12 python中编写无参数decorator

2015-03-23

破狼

class Person(object):

def __init__(self, name, gender, **kw):
self.name = name
self.gender = gender
for k,v in kw.items():
setattr(self, k ,v)

p = Person('Bob', 'Male', age=18, course='Python')
print p.age
print p.course

0 5-6 python中获取对象信息

2015-03-23

破狼

class Person(object):
count =0
def __init__(self, name):
self.name = name
Person.count +=1

p1 = Person('Bob')
print Person.count

p2 = Person('Alice')
print Person.count

p3 = Person('Tim')
print Person.count

0 4-6 python中创建类属性

2015-03-22

破狼

class Person(object):
def __init__(self, name, score):
self.name = name
self.__score = score

p = Person('Bob', 59)

print p.name
print p.__score

0 4-5 python中访问限制

2015-03-22

破狼

class Person(object):
def __init__(self, name, sex, birth, **kw):
self.name = name
self.sex = sex
self.birth = birth
for (k,v) in kw.items():
setattr(self, k, v)

...

2 4-4 python中初始化实例属性

2015-03-22

破狼

L2 = sorted(L1, cmp = lambda x, y: cmp(x.name, y.name))

0 4-3 python中创建实例属性

2015-03-22

破狼

try:
import json as json
except ImportError:
import simplejson as json

print json.dumps({'python':2.7})

0 3-3 python中动态导入模块

2015-03-22

lipy

def calc_prod(lst):
def a():
return reduce(lambda x,y:x*y, lst)
return a

f = calc_prod([1, 2, 3, 4])
print f()

0 2-8 python中返回函数

2015-03-22

破狼

import time
def performance(f):
def fn(*args, **kw):
start = time.time()
try:
return f(*args, **kw)
finally:
print 'call {0}() in {1}s'.format(f.__name__, time.time() - start)
return fn
@performance
def factorial(n):
...

0 2-12 python中编写无参数decorator

2015-03-22

破狼

def count():
fs = []
for i in range(1, 4):
def f(i):
return lambda: i * i
fs.append(f(i))
return fs

f1, f2, f3 = count()
print f1(), f2(), f3()

0 2-9 python中闭包

2015-03-22

破狼

def calc_prod(lst):
return lambda: reduce(lambda x, y : x * y, lst)

f = calc_prod([1, 2, 3, 4])
print f()

0 2-8 python中返回函数

2015-03-22

def f1（x) 后面为什么能用f调用？

讲师回答 / 廖雪峰

f是一个函数，x是参数，f(x)是函数调用

4 回答 1812 浏览 2-11 python中decorator装饰器

2015-03-22

一年后

这是spring里面的AOP么

0 2-11 python中decorator装饰器

2015-03-22

卡布奇熊

class Person(object):
def __init__(self, name, gender, **kw):
self.name=name
self.gender=gender
for key,value in kw.items():
setattr(self,key,value)
p = Person('Bob', 'Male', age=18, course='Python')
print p.age
print p.course

0 5-6 python中获取对象信息

2015-03-22

老爷车活到老学到老

两天从基础追完到加强。太棒了。python真奇妙！

1 6-9 python中 __call__

2015-03-22

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课程须知: 本课程是Python入门的后续课程 1、掌握Python编程的基础知识 2、掌握Python函数的编写 3、对面向对象编程有所了解更佳

老师告诉你能学到什么？: 1、什么是函数式编程 2、Python的函数式编程特点 3、Python的模块 4、Python面向对象编程 5、Python强大的定制类

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python进阶

def f1（x) 后面为什么能用f调用？