驻马店做网站多少钱,怎样制作h5,网页视频下载快捷指令库,用按键精灵做网站Python中while语句的一般形式#xff1a; while 判断条件: 语句 同样需要注意冒号和缩进#xff0c;另外在Python中没有do…while循环 下面的实例计算1到100总和 ##calc.py
n 100sum 0
counter 1
while counter n:sum sum countercounter 1print(total from… Python中while语句的一般形式 while 判断条件: 语句 同样需要注意冒号和缩进另外在Python中没有do…while循环 下面的实例计算1到100总和 ##calc.py
n 100sum 0
counter 1
while counter n:sum sum countercounter 1print(total from 1 to 100 : %d,sum) 运行结果 robotubuntu:~/wangqinghe/python/20190826$ python3.5 calc.py total from 1 to 100 : %d 5050 while循环中使用else语句 在while…else在条件语句为false时执行els语句块 #while.py
count 0
while count 5:print(count, 5)count count 1
else :print(count , 5) 运行结果 robotubuntu:~/wangqinghe/python/20190826$ python3.5 while.py 0 5 1 5 2 5 3 5 4 5 5 5 for循环 Python for循环可以遍历任何序列的项目如一个列表或一个字符串 for循环的 一般格式如下 for variable in sequence:statement
else:statement 实例 break语句用于跳出当前循环体 ##break.py
sites [Baidu,Google,Runoob,Taobao]
for site in sites:if site Runoob:print(cainiao!)breakprint(loop data site)
else:print(Having no loop data!)
print(loop end!) 运行结果 robotubuntu:~/wangqinghe/python/20190826$ python3.5 break.py loop data Baidu loop data Google cainiao! loop end! range()函数 如果你需要遍历数字序列可以使用内置的range()函数它会生成数列例如 也可以使range以指定数字开始并指定不同的增量甚至可以是负数有时这也叫步长 负数 也可以结合range()和len()函数以遍历一个序列的索引 还可以使用range()函数来创建一个列表 break和continue语句及循环中的else子句 break语句可以跳出for和while循环体如果你从for或while循环终止任何对应的循环else块将不执行 #else.py
for letter in Runoob:if letter b:break;print(the current letter : ,letter)print(the next example)var 10
while var 0:print(the current variable : ,var)var var - 1if var 5:break;
print(GOOF bye!) 运行结果 robotubuntu:~/wangqinghe/python/20190826$ python3 else.py the current letter : R the current letter : u the current letter : n the current letter : o the current letter : o the next example the current variable : 10 the current variable : 9 the current variable : 8 the current variable : 7 the current variable : 6 GOOF bye! continue语句被用来Python跳出当前循环块的剩余语句然后继续下一轮循环。 循环语句可以有else子句它在穷尽列表for循环或条件变为false以while循环导致循环终止时被执行但循环被break终止时不执行。 下列是查询质数的循环例子 ##prime.py
for n in range(2,10):for x in range(2,n):if n % x 0:print(n, ,x, *, n//x )breakelse:print(n, is prime) 运行结果 robotubuntu:~/wangqinghe/python/20190826$ python3 prime.py 2 is prime 3 is prime 4 2 * 2 5 is prime 6 2 * 3 7 is prime 8 2 * 4 9 3 * 3 pass语句 Python pass是空语句是为了保持程序结构的完整性。 pass不做任何事情一般用作占位语句 #pass.py
for letter in Runoob:if letter o:passprint(execute pass block)print(the current letter : ,letter)print(Good bye!) 运行结果 robotubuntu:~/wangqinghe/python/20190826$ python3 pass.py the current letter : R the current letter : u the current letter : n execute pass block the current letter : o execute pass block the current letter : o the current letter : b Good bye! pass只是为了防止语法的错误 pass就是一条空语句在代码段中或定义函数时如果没有内容或者就先不做任何处理直接跳过就可以先使用pass 十进制转换 #translate.py
while True:number input(please input a integer(enter Q exit ):)if number in [q,Q]:breakelif not number.isdigit():print(input error,please continue input : )continueelse:number int(number)print(decimal -- hexadecimal: %d - 0x%x%(number,number))print(decimal -- octonary: %d - 0x%o%(number,number))print(decimal -- binary: %d - %number,bin(number)) 运行结果 robotubuntu:~/wangqinghe/python/20190826$ python3 translate.py please input a integer(enter Q exit ):9 decimal -- hexadecimal: 9 - 0x9 decimal -- octonary: 9 - 0x11 decimal -- binary: 9 - 0b1001 please input a integer(enter Q exit ):18 decimal -- hexadecimal: 18 - 0x12 decimal -- octonary: 18 - 0x22 decimal -- binary: 18 - 0b10010 please input a integer(enter Q exit ):q 转载于:https://www.cnblogs.com/wanghao-boke/p/11414083.html
