python学习

Python

• 定义变量

直接定义

a=1

b=2

a+b

定义函数

def hello():

print "hello world!"

def max(a,b):

if a>b:

return a

else:

return b

hello()

print(max(8,6))

循环

for i in range(0,100):

print("Item{0},{1}".format(i,"hello,world!"))

此处的{0},{1}，作为占位符号，把后面format之后的数据进行输入。

面向对象--定义类

Example1:

class hello:

def __init__(self,name):   ***此处的self,name是怎么个意思？

self._name = name

def sayhello(self):

print("hello {0}".format(self._name))

h = hello("coin")

h.sayhello()

example2:

class hello:

def __init__(self,name):

self._name = name

def sayhello(self):

print("hello {0}".format(self._name))

class Hi(hello):

#此处使用赋类的方法

def __init__(self,name):

hello.__init__(self,name)

def sayHi(self):

print ("Hi {0}i".format(self._name))

h = hello("coin")

h.sayhello()

hi = Hi("zhangsan")

hi.sayHi()