python基础之二：占位符、格式化输出、while else 、逻辑运算

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)