[Tutor] how to accept an integer?
I dun understand the mistake. My aim is to accept an integer number. The python lookup in IDLE asks for a string object but the interpreter returns with the following error message. Some one pls explain. Thank You PS : I understand that i can do type conversion after getting input thru raw_input(). But how does input() function work? prompt=temme a number\n speed =input(prompt) Traceback (most recent call last): File pyshell#56, line 1, in module speed =input(prompt) TypeError: 'str' object is not callable speed =input(temme a number\n) Traceback (most recent call last): File pyshell#57, line 1, in module speed =input(temme a number\n) TypeError: 'str' object is not callable ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to accept an integer?
Mahesh N wrote: I dun understand the mistake. My aim is to accept an integer number. The python lookup in IDLE asks for a string object but the interpreter returns with the following error message. Some one pls explain. Thank You PS : I understand that i can do type conversion after getting input thru raw_input(). But how does input() function work? prompt=temme a number\n speed =input(prompt) Traceback (most recent call last): File pyshell#56, line 1, in module speed =input(prompt) TypeError: 'str' object is not callable speed =input(temme a number\n) It looks like you have named a string 'input'; this hides the built-in 'input' function and causes the error you are seeing. Restart IDLE and input() should work correctly. A safer way to accept an integer is to use raw_input() and convert the result yourself: try: speed = int(raw_input(prompt)) except ValueError: print 'You did not enter an integer' Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to accept an integer?
Mahesh N wrote: I dun understand the mistake. My aim is to accept an integer number. The python lookup in IDLE asks for a string object but the interpreter returns with the following error message. Some one pls explain. Thank You PS : I understand that i can do type conversion after getting input thru raw_input(). But how does input() function work? Did you read this? http://docs.python.org/lib/built-in-funcs.html#l2h-40 What do you not understand about it? prompt=temme a number\n speed =input(prompt) Traceback (most recent call last): File pyshell#56, line 1, in module speed =input(prompt) TypeError: 'str' object is not callable speed =input(temme a number\n) Traceback (most recent call last): File pyshell#57, line 1, in module speed =input(temme a number\n) TypeError: 'str' object is not callable ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to accept an integer?
On Dec 6, 2007 2:31 AM, Mahesh N [EMAIL PROTECTED] wrote: I dun understand the mistake. My aim is to accept an integer number. The python lookup in IDLE asks for a string object but the interpreter returns with the following error message. Some one pls explain. Thank You PS : I understand that i can do type conversion after getting input thru raw_input(). But how does input() function work? prompt=temme a number\n speed =input(prompt) Traceback (most recent call last): File pyshell#56, line 1, in module speed =input(prompt) TypeError: 'str' object is not callable speed =input(temme a number\n) Traceback (most recent call last): File pyshell#57, line 1, in module speed =input(temme a number\n) TypeError: 'str' object is not callable absolutely, i went up the shell and found out that i had declared a variable named input and it was shadowing the input() function. i restarted the shell and now everything's fine. Thanks Everyone. -- The Place where I Come from, We Face our Enemies, If our enemy is Unarmed, We Offer our SWORD!!! Courtesy Warrior Within ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to accept an integer?
On Dec 6, 2007 2:37 AM, Eric Brunson [EMAIL PROTECTED] wrote: Mahesh N wrote: I dun understand the mistake. My aim is to accept an integer number. The python lookup in IDLE asks for a string object but the interpreter returns with the following error message. Some one pls explain. Thank You PS : I understand that i can do type conversion after getting input thru raw_input(). But how does input() function work? Did you read this? http://docs.python.org/lib/built-in-funcs.html#l2h-40 What do you not understand about it? prompt=temme a number\n speed =input(prompt) Traceback (most recent call last): File pyshell#56, line 1, in module speed =input(prompt) TypeError: 'str' object is not callable speed =input(temme a number\n) Traceback (most recent call last): File pyshell#57, line 1, in module speed =input(temme a number\n) TypeError: 'str' object is not callable ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor sorry i dint go thru the docs. i thought i will delve into it once i felt comfortable with the language. is the new line character not allowed in input() statement ??? cuz i tried it without the new line character and it works fine. More over i find python to be a little sluggish after having worked with C and Java. But one thing's for sure. Its damn powerful and a lovely language. can someone temme where python is most applicable? server side scripting? am i guessing it right? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to accept an integer?
On Dec 5, 2007 4:01 PM, Mahesh N [EMAIL PROTECTED] wrote: I dun understand the mistake. My aim is to accept an integer number. The python lookup in IDLE asks for a string object but the interpreter returns with the following error message. Some one pls explain. Thank You PS : I understand that i can do type conversion after getting input thru raw_input(). But how does input() function work? prompt=temme a number\n speed =input(prompt) Traceback (most recent call last): File pyshell#56, line 1, in module speed =input(prompt) TypeError: 'str' object is not callable You have code that you haven't shown us. My crystal ball tells me that somewhere above this point you did input = Some String, thus shadowing the builtin input function. Start a new interpreter and try again and you should find that it works as expected. As I'm sure you'll hear from others, it really is best to use raw_input instead. If you want an integer instead of a string, do something like this: speed = int(raw_input(prompt)) That way whatever the user types isn't run as python code, just read in as a string and then converted into an integer. -- Jerry ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to accept an integer?
Bryan Fodness wrote: speed = int(raw_input(prompt)) Is this how ALL known integers should be input? Yes, with probably a try/except block and a while loop around it to handle invalid input. There are two good reasons for doing this instead of using input: - it guarantees that the input is in fact an integer (raises ValueError otherwise) - it protects against malicious input (you can do a lot of damage in an input(), whatever you type is eval'ed) For input of unknown integers, you are on your own, Python does not have anything built-in for that ;-) Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to accept an integer?
On Dec 5, 2007 4:46 PM, Bryan Fodness [EMAIL PROTECTED] wrote: On Dec 5, 2007 4:16 PM, Jerry Hill [EMAIL PROTECTED] wrote: speed = int(raw_input(prompt)) Is this how ALL known integers should be input? I don't think I understand the question. If you are prompting your user to enter an integer from the console, then yes, this is the general way you should do it, probably wrapped in a try/except block. You certainly don't have to do it all in one line like that. Instead, you could split it up into component parts, like this: prompt = Please enter a number between 1 and 10:\n user_input = raw_input(prompt) try: user_number = int(user_input) except ValueError: print You did not enter a number. -- Jerry ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to accept an integer?
Mahesh N [EMAIL PROTECTED] wrote PS : I understand that i can do type conversion after getting input thru raw_input(). But how does input() function work? prompt=temme a number\n speed =input(prompt) Traceback (most recent call last): File pyshell#56, line 1, in module speed =input(prompt) TypeError: 'str' object is not callable This suggests that you have a variable somewhere called input that is hiding the function. Try doing del(input) and try it again. As to what input does; it evaluates whatever string you give to it so if your user types in some malicious Python code input will execute it. For that reason input is usually frowned on as a security risk and int(raw_input()) is preferred. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to accept an integer?
Mahesh N [EMAIL PROTECTED] wrote More over i find python to be a little sluggish after having worked with C and Java. If you translate C or Java code into python you will usually get a less than optimal implementation. Python should be barely slower than Java and often faster. Compared to C - yes there is a slow-down. But even in C you can use tools like Psycho and Pyrex to speed up critical sections to near C speeds if the problem fits. Or rewrite the critical section in C and wrap it as a module using SWIG. Thats how most of the performance ritical modules in the library are written. Where the major bottleneck is I/O work like database disk access or GUI or network sockets then you should find Python fast enough. can someone temme where python is most applicable? server side scripting? am i guessing it right? Python has been used in almost every form of programming from image processing and database manipulation to games programming and web server development. Do a search on Source Forge for projects using Python for an example of the variety. I'd avoid operating systems, device drivers and hard real-time applications though. -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to accept an integer?
On Dec 5, 2007 4:16 PM, Jerry Hill [EMAIL PROTECTED] wrote: On Dec 5, 2007 4:01 PM, Mahesh N [EMAIL PROTECTED] wrote: I dun understand the mistake. My aim is to accept an integer number. The python lookup in IDLE asks for a string object but the interpreter returns with the following error message. Some one pls explain. Thank You PS : I understand that i can do type conversion after getting input thru raw_input(). But how does input() function work? prompt=temme a number\n speed =input(prompt) Traceback (most recent call last): File pyshell#56, line 1, in module speed =input(prompt) TypeError: 'str' object is not callable You have code that you haven't shown us. My crystal ball tells me that somewhere above this point you did input = Some String, thus shadowing the builtin input function. Start a new interpreter and try again and you should find that it works as expected. As I'm sure you'll hear from others, it really is best to use raw_input instead. If you want an integer instead of a string, do something like this: speed = int(raw_input(prompt)) Is this how ALL known integers should be input? That way whatever the user types isn't run as python code, just read in as a string and then converted into an integer. -- Jerry ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -- The game of science can accurately be described as a never-ending insult to human intelligence. - João Magueijo ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
