python第一课

#1
# if 3 > 4:
#     print(777)
# else:
#     print(888)
#2
# if 3 > 5:
#     print(666)
# print(777)
#3
# num=input('请输入')
# if num==1:
#     print('抽烟')
# elif num=='2':
#     print('喝洒')
# elif num=='3':
#     print('睡觉')
# else:
#     print('猜对')
#4
# score = int(input("输入分数:"))
# if score >= 100:
#     print("我擦,最高分才'100...")
# elif score >= 90:
#     print("A")
# elif score >= 80:
#     print("B")
# elif score >= 60:
#     print("C")
# elif score >= 40:
#     print("P")
# else:
#     print("笨蛋")
#5
# print('111')
# while True:
#     print('我喜欢你启丽')
#     print('我爱你启丽')
#     print('我想和你睡觉启丽')
# print('OK')

#6
# count=1
# flag=True
# while flag:
#     print(count)
#     count=count+1
#     if count > 100:
#         flag =False
#7
# count=1
# while count <= 100:
#     print(count)
#     count = count+1

#8
# count=1
# sum=0
# while count<=100:
#     sum=sum+count
#     count=count+1
# print(sum)
#9 break
# print('11')
# while True:
#     print('222')
#     print(333)
#     break
#     print(444)
# print('abc')

# count = 1
# while True:
#     print(count)
#     count=count+1
#     if count > 100:
#         break
# print(111)
# count = 1
# while count < 20:
#     print(count)
#     continue
#     count = count+1

# count = 0
# while count <=100:
#     count=count+1
#     if count > 5 and count< 95:
#         continue
#     print("loop",count)
# print("-------out ol while toop-------")

 

#使用while循环输入12345678910
# count=0
# while count < 10:
#     count += 1
#     if count == 7:
#         print('')
#     else:
#         print(count)
# count = 0
# while count < 10:
#     count += 1
#     if count == 7:
#         continue
#     print(count)
#求1-100所有数的和
# count=1
# sum=0
# while count <=100:
#     sum=count+sum
#     count+=1
# print(sum)
#输出1-100内的所有奇数
#方法一
# count=1
# while count<101:
#     print(count)
#     count+=2
#方法二
# count=1
# while count<101:
#     if count % 2 == 1:
#         print(count)
#     count+=1

#求1-2+3-4+5....99所有数的和
# count=1
# sum=0
# while count <100:
#     if count % 2 == 0:
#         sum = sum - count
#     else:
#         sum=sum+count
#     count+=1
# print(sum)
#用户登陆（三次机会重试）
#input心中有帐号，密码 while
# i=0
# while i < 3:
#     username = input('请输入帐号:')
#     password = int(input('请输入密码:'))
#     if username == '咸鱼哥' and password == 123:
#         print('登陆成功')
#     else:
#         print('登陆失败请重试')
#     i +=1