2、Python自学第二天（if判断，for循环，while循环），, 1 ＂＂＂====

2、Python自学第二天（if判断，for循环，while循环），, 1 """====

 1 """================ if判断 begin ====================== 2  3 # 输入一个年龄，判断是成年人还是小孩 4 age = input(‘请输入年龄‘) 5 if int(age)>=18: 6     print(‘成年人‘) 7     exit() 8 print(‘小孩‘) 9 10 # 输入一个数字，判断是奇数还是偶数11 num = input(‘请输入一个数字‘)12 if int(num) % 2 == 0:13     print(‘偶数‘)14     exit()15 print(‘奇数‘)16 17 # 输入一个月份，判断是哪个季节，python中没有 && , || ，用 and 或 or 来表示18 season = int(input(‘请输入一个月份：‘))19 if season >=3 and season <=5:20     print(‘春季‘)21 elif season >=6 and season <=8:22     print(‘夏季‘)23 elif season >=9 and season <=11:24     print(‘秋季‘)25 else:26     print(‘冬季‘)27 28 # 练习29 小明身高1.75，体重80.5kg。请根据BMI公式（体重除以身高的平方）帮小明计算他的BMI指数，并根据BMI指数：30 31 低于18.5：过轻32 18.5-25：正常33 25-28：过重34 28-32：肥胖35 高于32：严重肥胖36 bmi = 80.5 / pow(1.75,2)37 if bmi < 18.5:38     str = ‘过轻‘39 elif bmi >= 18.5 and bmi < 25:40     str = ‘正常‘41 elif bmi >=25 and bmi < 28:42     str = ‘过重‘43 elif bmi >=28 and bmi < 32:44     str = ‘肥胖‘45 else:46     str = ‘严重肥胖‘47 print(str)48 49 =================== if判断 end ========================"""50 51 52 """=============== for 循环 begin ============================53 54 name = [‘tom‘,‘bob‘,‘tim‘]55 for n in name:56     print(n)57     58 # 用for循环计算1-10的和59 sum = 060 nums = [1,2,3,4,5,6,7,8,9,10]61 for i in nums:62     sum += i63 print(sum)64 65 # 用for循环计算1-100的值，range(x,y)函数用来生成一个大于x，小于y的列表，如果range(z)一个参数的情况下会生成一个大于等于66 0，小于101的列表67 sum = 068 for i in range(1,101):69     sum += i70 print(sum)71 72 ================== for 循环 end============================"""73 74 """=============== while 循环 begin =============================75 76 # 用while循环计算1-10的和77 i = 178 sum = 079 while i<=10:80     sum += i81     i+=182 print(sum)83 84 # 用while循环逆向输出10-185 num = 1086 while num>=0:87     print(num)88     num = num-189     90 ================== while 循环 end ====结束时间：2018:11-23 0:06========================"""

2、Python自学第二天（if判断，for循环，while循环）