Bây giờ bạn đã sửa đổi mã chương trình, đó là thời gian để xem nếu nó hoạt động. Hãy chắc chắn rằng các mã sửa đổi trong IDLE, và sau đó nhấn F5 để chạy chương trình của bạn. Để bắt đầu, hãy gửi một tin nhắn khẩn cấp: Bạn đã yêu cầu một mức giá hợp khẩn cấp và ở đây nó là. | functions Tesr Drive Now you ve amended the program code it s time to see if it works. Make sure the amended code is in IDLE and then press F5 to run your program. To begin let s send an emergency message You asked -for That worked. But what about the price-watch option. you are here 4 99 message received ĨQST Drive conTinueD. ybu detide to wait and eventually the tweet with a message to buy tomes thru when the yrite is right - LỊplp ili nirt rtehug Qpthnn Window Python F31S 3 72 Jul õcr ran Tiruix Type copyright creditB H 2009 OHỈDU OU licenser tor Crore in tonnation RESTART nnw Y N N Dra you want tn are price ữ Ờ A I BiiPATMiWCCMW twiift What arc you doing lĩcmc V QMZCJfi Python shflll That works as well. You re ready to go live Beep beey was that someone s yhone matter where the Starbuzz. CEỚ is it he has his Cell nearby he gets the message- Great an emergency order I ll quickly place a call before we run out of beans again. 100 Chapter 3 functions -th reiareno Dumb Questions 0 Can I still call the Twitter function like this send_to_ twitter Or do I always have to provide a value for the msg parameter A. As it s written the parameter is required by the function. If you leave it out Python will complain and refuse to run your code further. 0 Can parameters to functions be optional A Yes. In most programming languages including Python you can provide a default value for a parameter which is then used if the calling code doesn t provide any value. This has the effect of making the parameter optional in that it either takes its value from the one provided by the caller or uses the default value if the caller does not provide anything. 0 Can there be more than one parameter A Yes you can have as many as you like. Just bear in mind that a function with a gazillion parameters can be hard to understand let alone use. 0 Can all the parameters be optional A Yes. As an example Python s built-in print function can have up to three optional parameters in
