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为什么要加else

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今天又是元气满满的一天

#1 Created at ... [Delete] [Delete and Lock User]

if else 一起可以确定终止递归的情况，防止无限递归下去

不用else的话可以用return，同样可以中断函数，终止递归，return是常用于递归函数的语句

今天又是元气满满的一天

#2 Created at ... [Delete] [Delete and Lock User]

用return的写法：

def move(n, a, b, c):
    if n == 1:
        print(a, '-->', c)
        return    
    move(n-1, a, c, b)
    print(a, '-->', c)
    move(n-1, b, a, c)

move(3, 'A', 'B', 'C')

今天又是元气满满的一天

#3 Created at ... [Delete] [Delete and Lock User] 
def move(n, a, b, c):    if n == 1:        print(a, '-->', c)        return    move(n-1, a, c, b)    print(a, '-->', c)    move(n-1, b, a, c)move(3, 'A', 'B', 'C')

今天又是元气满满的一天

#4 Created at ... [Delete] [Delete and Lock User] 
def move(n, a, b, c):
    if n == 1:
        print(a, '-->', c)
        return    move(n-1, a, c, b)
    print(a, '-->', c)
    move(n-1, b, a, c)

move(3, 'A', 'B', 'C')

今天又是元气满满的一天

#5 Created at ... [Delete] [Delete and Lock User] 
def move(n, a, b, c):
    if n == 1:
        print(a, '-->', c)
        return    
move(n-1, a, c, b)
    print(a, '-->', c)
    move(n-1, b, a, c)

move(3, 'A', 'B', 'C')

今天又是元气满满的一天

#6 Created at ... [Delete] [Delete and Lock User] 
def move(n, a, b, c):
    if n == 1:
        print(a, '-->', c)
        return    
    move(n-1, a, c, b)
    print(a, '-->', c)
    move(n-1, b, a, c)

move(3, 'A', 'B', 'C')

今天又是元气满满的一天

#7 Created at ... [Delete] [Delete and Lock User] 
def move(n, a, b, c):
    if n == 1:
        print(a, '-->', c)
        return    
  move(n-1, a, c, b)
    print(a, '-->', c)
    move(n-1, b, a, c)

move(3, 'A', 'B', 'C')
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