python day 2

#运算符
#print(3>4 or 4<3 and 1==1)
# #print(2 or 100)
# print(1 > 2 and 3 or 4 and 3 < 2)
# i= 3
# # b = bool(i)
# # print(b)
# # i = True
# # b = int(i)
# # print(b)
# # i = '2'
# # b = bool(i)
# # print(b)
#
# s = 'ABCDEFGH'
# s1 = s[-1::-1]
# print(s1)
# li = ['张三','李四']
# while 1 :
#     username = input('>>>')
#     if username.strip().upper() == 'Q':
#         break
#     else:
#         li.append(username)
# print(li)
#