err.py

# def a():
#     total = []
#     while True:
#         unit= input("请输入：")
#         if unit== 'q':
#             break
#         else:
#             total.append(unit)
#     print(total)
# a()


try:
    a=int(input("请输入数字："))
except:
    print("请输入一个数字哦~")
else:
    if a<18:
        print("未成年不许喝酒哦")