python简单方法判断三个数能否组成三角形 #encoding=utf-8 import math while True: str=raw_input("please input three numbers a,b,c:('stop' to exit)") print "####",str,type(str) if str !="stop": x,y,z = eval(str) min_value=min(x,y,z) max_value=ma
1. 循环的定义,反复做某事,具有明确的开始和结束. 2. 在Python中循环有while和for两种方式: While循环:1) 语法结构 >>> while 条件: ... 需要循环的语句 >>> i = 0 >>> while i < 3: ... print (i) ... i += 1 ... 0 1 2 For 循环: 1) 语法结构 >>> for i in range(2): #
Python中有while循环和for循环 下面以一个小例子来说明一下用法,用户输入一些数字,输出这些数字中的最大值和最小值 array = [5,4,3,1] for i in array: print(i) largest = None smallest = None while True: num = input("Enter a number: ") if num == "done" : break if len(num) < 1 : break #
--start-- for循环: for i in range(3): user_input = input("Your username:") passwd = int(input("Your password:")) if user_input == valid_user and passwd == valid_passwd: print("%s: Welcome to login!" % user_input) break elif use
假设有如下代码: for i in range(10): if i == 5: print 'found it! i = %s' % i else: print 'not found it ...' 你期望的结果是,当找到5时打印出: found it! i = 5 实际上打印出来的结果为: found it! i = 5 not found it ... 显然这不是我们期望的结果. 根据官方文档说法: >When the items are exhausted (which is immedi