Python提问，求大家帮帮我，为啥输出一直是沪市A股

dm=input()
if dm[0:3] =='600' or '601' or '603':
print('沪市A股')
elif dm[0:3] == '688':
print('科创板')
elif dm[0:3] == '000':
print('深市A股')
elif dm[0:3] == '002':
print('中小板')
else:
print('NO')

dm = input()
print(dm[0:3])
if dm[0:3] == ('600' or '601' or '603'):
    print('沪市A股')
elif dm[0:3] == '688':
    print('科创板')
elif dm[0:3] == '000':
    print('深市A股')
elif dm[0:3] == '002':
    print('中小板')
else:
    print('NO')