Python基础

Posted 2020-10-28 yexuesong

Python的流程控制

if else ,  for ,  range() ,  break continue ,  pass

 Python 的 for 语句依据任意序列（链表或字符串）中的子项，按它们在序列中的顺序来进行迭代。

 与循环一起使用时，else 子句与 try 语句的 else 子句比与 if 语句的具有更多的共同点：try 语句的 else 子句在未出现异常时运行，循环的 else 子句在未出现 break 时运行。

 定义函数

def fibs(n):
    """Print a Fibonacci series up to n."""
    a,b = 0,1
    while a < n:
        print (a)
        a,b = b,a+b
---
def fibs(max):
    """Print a Fibonacci series of the first n."""
    n,a,b = 0,0,1
    while n < max:
        print (a)
        a,b = b,a+b
        n = n + 1
    return ‘done‘
‘‘‘
a, b = b, a+b

be equal to

t = (b, a+b) # t is a tuple
a = t[0]
b = t[1]
‘‘‘

def fib2(n): # return Fibonacci series up to n
    """Return a list containing the Fibonacci series up to n."""
    result = []
    a, b = 0, 1while a < n:
        result.append(a)    # see below
        a, b = b, a+b
    return result

 

 

 

 

 

 

 

参考链接1

参考链接2