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  • day02五大运算符:逻辑运算符、成员运算符、算数、比较、赋值、

    # -*- encoding: utf-8 -*-
    # print('hello 中国')
    # 变量
    # print(10 + 20 + 3 + 15)
    # print((10 + 20 + 3 + 15)*3/2)

    # print((((10 + 20 + 3 + 15)*3/2)+5)/3)
    '''
    x = 10 + 20 + 3 + 15
    y = x*3/2
    z = (y + 5)/3
    print(x)
    print(y)
    print(z)

    i1 = 11 # True
    2q = 12 # False 不能数字开头
    _name = 'alex' # True
    _ = 55 # True
    __ = 'fdjska' # True
    _ _ = 123 # False 有空格
    q_1 = 55 # True
    q34q = 11 #True
    '''

    # 变量的小高级
    '''
    age1 = 12
    age2 = age1
    age3 = age2
    age2 = 18
    print(age1,age2,age3)
    # 12 18 12
    # 12 18 18
    # 常量
    BIRTH_OF_CHINA = 1949
    BIRTH_OF_CHINA = 1990
    print(BIRTH_OF_CHINA)
    '''

    # 注释
    # print('15') # 本行打印15结果。

    # 基础数据类型

    # ret = '太白金星'
    # ret1 = 'My name is tbjx, i'm 18'
    # ret1 = "My name is tbjx, i'm 18"
    # print(ret1)

    '''
    msg = """今天我想写首小诗,
    歌颂我的同桌,
    你看他那乌黑的短发,
    好像一只炸毛鸡。"""
    print(msg)
    r1 = 100
    r2 = 'fsda'
    r3 = alex
    r4 = 'fdsafd'
    r5 = '100'
    '''
    # + 字符串的拼接
    '''
    s1 = 'alex'
    s2 = ' dsb'
    s3 = s1 + s2
    print(s3)
    '''

    # 字符串可以与数字相乘
    '''
    s1 = '坚强'
    i1 = 8
    print(s1*i1)
    '''

    # bool
    """
    print(3 > 2)
    print(3 > 5)

    print('True')
    print(False)
    """
    # s1 = 'True'
    # s2 = True
    '''
    s1 = '100'
    s2 = 100
    print(s1)
    print(s2)
    '''

    # 验证这个内容是什么数据类型 type
    '''
    s1 = '100'
    s2 = 100
    print(s1,type(s1))
    print(s2,type(s2))
    '''

    # 用户输入input
    '''
    name = input('请输入姓名;')
    age = input('请输入年龄:')
    # sex
    # print(name, age,type(age))
    print('我的姓名是 我的年龄是 我的性别是 ')
    '''
    #

    '''
    name = input('请输入姓名;')
    age = input('请输入年龄:')
    sex = input('请输入性别:')
    msg = '我的姓名是'+name+'我的年龄是'+age+'我的性别是 '+sex
    print(msg)

    name = '太白金星'
    n1 = name
    n2 = 'name'
    print(n1)
    print(n2)
    '''

    # 第一种:if
    '''
    dream = input('长大了想做什么?')
    if dream == '医生':
    print('看病免费')
    print(666)
    a = 20
    b = 3
    print(a+ b)
    '''
    # 第二种
    # 条件成立执行if的内容,条件不成立执行else
    '''
    age = int(input('请输入年龄:'))

    if age > 18:
    print('做你想做的事情')
    else:
    print('小屁孩儿')
    print(666)


    # 补充:str int 之间的转换
    # str '00100' ---> int 字符串必须是合乎数字规定的内容
    i1 = '100'
    i2 = int(i1)
    # print(type(i2))
    # int ---- > str
    i = 100
    i3 = str(i)
    print(type(i3))
    '''

    # 第三种:
    '''
    num = input('请输入你猜测的数字:')

    if num == '6':
    print('请你吃饭')

    elif num == '3':
    print('不用写作业了')

    elif num == '1':
    print('我请你大宝剑')
    '''

    # 第四种
    '''
    num = input('请输入你猜测的数字:')

    if num == '6':
    print('请你吃饭')

    elif num == '3':
    print('不用写作业了')

    elif num == '1':
    print('我请你大宝剑')

    else:
    print('真笨,都没猜中')

    # print(666)

    score = int(input("输入分数:"))

    if score > 100:
    print("我擦,最高分才100...")
    elif score >= 80:
    print("B")
    elif score >= 90:
    print("A")
    elif score >= 60:
    print("C")
    elif score >= 40:
    print("D")
    else:
    print("太笨了...E")
    '''

    # 第五种 嵌套if

    code = input('请输入验证码:')
    username = input('请输入用户名:')
    password = input('请输入密码:')
    if code == 'qwe3':
    if username == 'alex' and password == '123':
    print('登陆成功')
    else:
    print('用户名或者密码错误')

    else:
    print('验证码错误')
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  • 原文地址:https://www.cnblogs.com/xingkongzhizhu/p/10506073.html
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