函數--廖雪峯視頻

函數：將某些共有的功能抽象出來，能夠直接調用，避免重複定義

1

1 def power(x, n = 2):#默認參數
2 2     s = 1
3 3     while n > 0:
4 4         n = n -1
5 5         s = s * x
6 6    return s

 

1 def enroll(name, gender, age = 6, city = 'beijing'):#多個默認參數
2         print('name:',name)
3         print('gender:',gender)
4         print('age:',age)
5         print('city:',city)

 

1 def fact(n):#遞歸函數，調用自身
2     if  n==1:
3         return 1
4     else:
5         return n * fact(n-1)

1 def move(n, a, b, c):#漢諾塔遞歸
2     if n == 1:
3         print('move', a, '-->', c)
4     else:
5         move(n-1, a, c, b)# 不太理解爲何是n-1
6         move(1, a, b, c)# 不太理解爲何是1,爲何用move
7         move(n-1, b, a, c)