2. Python语言基本语法


（1）定义变量

1 a = 10
2 b = 2
3 c = a + b

（2）判断语句

 1 score = 90
 2 
 3 if score >= 80 :
 4    print("优秀")
 5 elif score >= 70 :
 6    print("中等")
 7 elif score >= 60 :
 8   print("及格")
 9 else:
10    print("不及格")

（3）循环

1 for i in range(0,5,2):
2    print(i)
3 print("================")
4 for i in range(0,5):
5    print(i)
6 print("================")
print("Item {0} {1}".format(10,"eee"))
for i in range(0,5):
   print(i)
else:
   print("循环结束")

（4）函数

 1 def sayHello():
 2    print("Hello world")
 3 
 4 sayHello()
 5 
 6 def myMax(x,y):
 7    if x > y :
 8       print x,"is Max"
 9    else:
10       print y,"is Max"
11 myMax(10,9)
12 
13 def myMaxVal(x,y):
14    if x > y :
15       return x
16    return y
17 
18 print(myMaxVal(10,8))

（5）对象

 1 class Hello:
 2    def __init__(self, name):
 3       self.name = name
 4       print("Hello 构造函数")
 5    def __del__(self):
 6       print("Hello 析构函数")
 7 
 8    def sayHello(self):
 9       print("Hello {0}".format(self.name))
10 
11 class Hi(Hello):
12    def __int__(self,name):
13       Hello.__init__(self,name)
14       self.name = name
15       print("Hi 构造函数")
16 
17    def sayHi(self):
18       print("Hi {0}".format(self.name))
19 
20 #Hello对象
21 h = Hello("zhangsan")
22 h.sayHello()
23 
24 #Hi对象
25 hi = Hi("lisi")
26 hi.sayHi()
27 hi.sayHello()

 (6) 引入Python文件

mylib.py

 1 # coding=utf-8
 2 class Hello:
 3    def __init__(self, name):
 4       self.name = name
 5       print("Hello 构造函数")
 6    def __del__(self):
 7       print("Hello 析构函数")
 8 
 9    def sayHello(self):
10       print("Hello {0}".format(self.name))

引用的两种方法

 1 #第一种
 2 import  mylib
 3 
 4 h = mylib.Hello("John")
 5 h.sayHello()
 6 
 7 #第二种
 8 from mylib import Hello
 9 
10 h = Hello("John")
11 h.sayHello()

 

posted @ 2016-04-15 20:27  renhl  阅读(185)  评论(0)  编辑  收藏  举报