Python基础三：函数和类

Posted 2020-09-02

• 函数的定义和调用

   1 def fun(x):
   2     if x > 0:
   3         print "x>0"
   4     else:
   5         print "x<=0"
   6  
   7 a = 3.5
   8 b = -1
   9 fun(a)
  10 fun(b)

• 类的定义和基本调用

   1 class Student:
   2     def __init__(self, name, age):
   3         self.name = name
   4         self.age = age
   5  
   6     def studying(self):
   7         print self.name, "is studying"
   8  
   9     def playing(self, something):
  10         print self.name, "is playing", something
  11  
  12     def info(self):
  13         print "Info:", "\n",14                "Name:", self.name, "\n",15               "Age:", self.age
  16  
  17 studentA = Student("studentA", 16)
  18 studentA.studying()
  19 studentA.playing("football")
  20 studentA.info()

• 类的继承：支持重写，多类继承，不直接支持重载

   1 class A:
   2     def __init__(self):
   3         print "A is a parent class"
   4  
   5     def funA(self):
   6         print "funA is in class A"
   7  
   8 class subA(A):
   9     def __init__(self):
  10         print "subA is a child class"
  11  
  12     def funsubA(self):
  13         print "funsubA is in class subA"
  14  
  15 parentA = A()
  16 childA = subA()
  17 childA.funA()
  18 childA.funsubA()