python 基础进阶

#统计行数，句子，字符

#!/usr/bin/env python
# -*- coding:utf-8 -*-
def wordCount(s):
    chars = len(s)
    words = len(s.split())
    lines = s.count('\n')
    print lines, words, chars


s = open('/etc/passwd').read()

if __name__ == '__main__':
    wordCount(s)
~

执行结果：
[root@python day03]# python wc.py 
27 36 1194

#类的方法，实例化

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author :Alvin.Xie
# @Time :2017/12/3 20:10
# @File :c1.py


class People(object):
    color = 'yellow'

    def think(self):
        self.color = "black"
        print "I am a %s" % self.color
        print "I am a thinker"


ren = People()
print ren.color
ren.think()

执行结果：
yellow
I am a black
I am a thinker

#类的私有变量，内置属性

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author :Alvin.Xie
# @Time :2017/12/3 21:41
# @File :c2.py


class People(object):
    color = 'yellow'
    __age = 30

    def think(self):
        self.color = "black"
        print "I am a %s" % self.color
        print "I am a thinker"
        print self.__age


ren = People()
print ren.color
ren.think()
print ren.__dict__

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author :Alvin.Xie
# @Time :2017/12/3 21:41
# @File :c2.py


class People(object):
    color = 'yellow'
    __age = 30

    def think(self):
        self.color = "black"
        print "I am a %s" % self.color
        print "I am a thinker"
        print self.__age


ren = People()
print ren.color
ren.think()
print ren.__dict__

执行结果：
yellow
I am a black
I am a thinker
30
{'color': 'black'}

#类的继承

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author :Alvin.Xie
# @Time :2017/12/3 22:56
# @File :c3.py


class People(object):
    color = 'yellow'

    def __init__(self):
        self.dwell = 'Earth'

    def think(self):
        print "I am a %s" % self.color
        print "I am a thinker"


class Chiness(People):
    pass


cn = Chiness()
print cn.dwell
cn.think()

执行结果:

Earth
I am a yellow
I am a thinker