手机号运营商判断

phone1_3=int(phone1[:3])
if not phone1.isdigit():
    print("非法输入")
else:
    if len(phone1)!=11:
        print("非法输入")
    else:
        if phone1_3>=130 and phone1_3<=150:
            print(str(phone1_3)+"移动")
        elif 151<=int(phone1[:3])<=170:
            print(phone1[:3]+"联通")
        elif 171 <= int(phone1[:3]) <= 199:
            print(phone1[:3]+"电信")
        else:
            print("未知运营商")