python进阶_技术问答

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菜鸟红

这一节课的内容还是没有搞明白啊

0 2-9 python中闭包

2018-10-09

Tim_Chan

print 'call %s () in %fs' % (f.__name__, (t2 - t1))
%s()。。。。s和括号中间需要加个空格

0 2-12 python中编写无参数decorator

2018-10-08

MintLucas

——只允许内部类访问，private

0 4-7 python中类属性和实例属性名字冲突怎么办

2018-10-08

MintLucas

分享代码
from os.path import isdir,isfile

print 'True'
print 'True'

0 3-2 python之导入模块

2018-10-07

MintLucas

分享代码
def cmp_ignore_case(s1, s2):
if s1.lower() < s2.lower():
return -1
if s1.lower() == s2.lower():
return 0
else:
return 1

print sorted(['bob', 'about', 'Zoo', 'Credit'], cmp_ignore_case)

0 2-7 python中自定义排序函数

2018-10-07

MintLucas

分享答案
import math

def is_sqr(x):
return math.sqrt(x)%1==0

print filter(is_sqr, range(1, 101))

0 2-6 python中filter()函数

2018-10-07

小肥鱼2020

map（）函数中function传入的是一个函数名!

1 2-4 python中map()函数

2018-10-06

慕后端4994399

class Fib(object):
def __call__(self,v):
pre,curr,L= 0,1,[]
for i in range(v):
L.append(curr)
pre,curr = curr,pre+curr
return L

f = Fib()
print f(10)

0 6-9 python中 __call__

2018-10-06

慕后端4994399

class Person(object):

__count = 0

@classmethod
def how_many(cls):
return cls.__count

def __init__(self,name):
self.name = name
Person.__count += 1

print Person.how_many()

p1 = Person('Bob')

print Person.how_many()

0 4-10 python中定义类方法

2018-10-05

慕后端4994399

class Person(object):
pass

p1 = Person()
p1.name = 'Bart'

p2 = Person()
p2.name = 'Adam'

p3 = Person()
p3.name = 'Lisa'

L1 = [p1, p2, p3]
L2 = sorted(L1,key=lambda p: p.name)

print L2[0].name
print L2[1].name
print L2[2].name

0 4-3 python中创建实例属性

2018-10-05

慕后端4994399

class Person:
pass

xiaoming = Person()
xiaohong = Person()

print xiaoming
print xiaohong
print xiaoming == xiaohong

0 4-2 python之定义类并创建实例

2018-10-05

fisher251

这个辗转相除好歹给个提示吧……

0 6-5 python中数学运算

2018-10-04

慕后端4994399

import time
def performance(unit):
def per_decorator(f):
def fn(*args):
print('%s call...' % unit)
return f(*args)
return fn
return per_decorator

@performance('ms')
def factorial(n):
return reduce(lambda x,y: x*y, range(1, n+1))
print factorial(10

0 2-13 python中编写带参数decorator

2018-10-04

慕后端4994399

import time

def performance(f):
def fn(x):
print("%4d-%02d-%02d %02d:%02d:%02d" % (time.localtime()[0:6]))
return f(x)
return fn

@performance
def factorial(n):
return reduce(lambda x,y: x*y, range(1, n+1))

print factorial(10)

0 2-12 python中编写无参数decorator

2018-10-04

慕后端4994399

import time

def performance(f):
def fn(x):
print(time.asctime())
return f(x)
return fn

@performance
def factorial(n):
return reduce(lambda x,y: x*y, range(1, n+1))

print factorial(10)

0 2-12 python中编写无参数decorator

2018-10-04

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