#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) #