python基础之二：占位符、格式化输出、while else 、逻辑运算

时间：2022-09-04 13:11:00

1、占位符和格式化输出

示例代码

 #格式化输出

 # % s d

 # name = input('请输入姓名')

 # age = input('请输入年龄')

 # height = input('请输入身高')

 # msg = "我叫%s，今年%s 身高 %s" %(name,age,height)

 # print(msg)

 """

 name = input('请输入姓名:')

 age = input('请输入年龄:')

 job = input('请输入工作:')

 hobbie = input('你的爱好:')

 msg = '''------------ info of %s -----------

 Name  : %s

 Age   : %d

 job   : %s

 Hobbie: %s

 ------------- end -----------------''' %(name,name,int(age),job,hobbie)

 print(msg)

 """

 name = input('请输入姓名')

 age = input('请输入年龄')

 height = input('请输入身高')

 msg = "我叫%s，今年%s 身高 %s 学习进度为3%%s" %(name,age,height)

 print(msg)
 '''

 用户登陆（三次输错机会）且每次错误时显示剩余的错误次数（提示：使用字符串格式化）

 '''

 i =

 while i < :

     i +=

     name = input("请输入您的登录名：")

     passwd = input("请输入您的密码：")

     if name == '张三' and passwd == '':

         print("登陆成功！")

         break

     else:

         print ("您的登录名或者密码不正确！您还有%s次输入机会！" % str( - i)) #要在print内才可以，否者报错：TypeError: unsupported operand type(s) for %: 'NoneType' and 'str'

2、while else语句

 count = 0

 while count <= 5 :

     count += 1

     if count == 3:break

     print("Loop",count)

 else:

     print("循环正常执行完啦")

 print("-----out of while loop ------")

3、逻辑运算

 #and or not

 #优先级，（）> not > and > or

 # print(2 > 1 and 1 < 4)

 # print(2 > 1 and 1 < 4 or 2 < 3 and 9 > 6 or 2 < 4 and 3 < 2)

 # T or T or F

 #T or F

 # print(3>4 or 4<3 and 1==1)  # F

 # print(1 < 2 and 3 < 4 or 1>2)  # T

 # print(2 > 1 and 3 < 4 or 4 > 5 and 2 < 1)  # T

 # print(1 > 2 and 3 < 4 or 4 > 5 and 2 > 1 or 9 < 8)  # F

 # print(1 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6)  # F

 # print(not 2 > 1 and 3 < 4 or 4 > 5 and 2 > 1 and 9 > 8 or 7 < 6) # F

 #ps  int  ----> bool   非零转换成bool True   0 转换成bool 是False

 # print(bool(2))

 # print(bool(-2))

 # print(bool(0))

 # #bool --->int

 # print(int(True))   # 1

 # print(int(False))  # 0

 '''x or y x True，则返回x'''

 # print(1 or 2)  # 1

 # print(3 or 2)  # 3

 # print(0 or 2)  # 2

 # print(0 or 100)  # 100

 # print(2 or 100 or 3 or 4)  # 2

 # print(0 or 4 and 3 or 2)

 '''x and y x True，则返回y'''

 # print(1 and 2)

 # print(0 and 2)

 print(2 or 1 < 3)

 print(3 > 1 or 2 and 2)

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