Re: [Tutor] Character Buffer Object Error
On 08/02/12 05:56, Michael Lewis wrote: I've tried the following code, but I am getting the following error. How do I do this properly? Christian answered the reason for the error. Here are some other comments... def AlterInput(user_input): print user_input new_output = '' make this a list not a string for index, char in enumerate(user_input): you don;t need index or enumerate just a simple for loop. if char.isdigit(): new_char = int(char) new_char += 1 How will you handle 9? Insert 10 or lose the 1 (or the zero?) Your choice... I'll assume you insert 10 new_output = ' '.join(user_input) I gave no idea what this is for, why insert spaces? Instead append new_char as a str to the list new_output.append(str(new_char)) This needs to be outside the if statement because you want to add all the chars. You will need to play with the assignments to make that work but it should be a lot simpler... At the very end join the list back to a string: return ''.join(new_output) new_output.replace(char, new_char) You don't need this with a list print new_output Best to keep print statements outside the function and just return the value AlterInput(user_input.split()) You don't need to split, just pass in the users string. HTH, -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python editor
On Mon, Feb 06, 2012 at 06:11:13PM +, Alan Gauld wrote: On 06/02/12 17:17, bob gailer wrote: On 2/6/2012 10:25 AM, Kapil Shukla wrote: Please also suggest a free editor for python which can at least repeat previous command with a key stroke That depends on the editor's mode of operation. In an editor like vi (elvis, vim etc) there is a repeat key (the period) that repeats most things because most things are a command - even inserting text. but in a so called modeless editor (most modern ones) repeat will be restricted to things that are recognised as atomic operations, like search/replace, change case etc. And some of those will only be valid when text is selected (so not really modeless!). Other editors like emacs allow you to specify how often an action is repeated. So esc-16 n will insert 16 n's for example. You would need to be more specific in terms of what you want in a repeat operation. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor !DSPAM:4f3018592251995719914! My personal choices are nvi for command line editor and TextMate for GUI on Mac OS X. I don't use Windows systems so haven't a clue what's on offer for that platform. I learned nvi just because it's the default editor installed on NetBSD base system which is my primary computing platform. There's just so many editors now it's difficult to know what will suit you best. It would mostly come down to the environment you are most comfortable working in; I spend 90% of my time in a UNIX shell so the command line editors suit me better. Jamie ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] general basic question
Hello all: I have a general and very basic question if I may. I am in the process of attempting to write my first python app. I wanted to collect information and save it to lists and dictionaries. My question is, is it possible to save said lists and dictionaries in the program proper, or do i need to save the information to files on the hard drive. I apologize for the simplistic nature of my query. I have been reading various python books on and off for well over a month and I have to admit i am having a hard time ingesting the concepts. I have been googling and perusing articles and books but i can't grasp more then the most basic of concepts of what i'v gone over. I'm not looking for any thing more then a yes or no, I plan on beating my head against python until it starts to sink in or it kills me. Any help would be greatly appreciated. thank you___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] general basic question
Hi Ken, Welcome to Python and to programming in general. On 8 February 2012 13:40, ken brockman krush1...@yahoo.com wrote: Hello all: I have a general and very basic question if I may. I am in the process of attempting to write my first python app. I wanted to collect information and save it to lists and dictionaries. My question is, is it possible to save said lists and dictionaries in the program proper, or do i need to save the information to files on the hard drive. You would save the information in files external and seperate to the source code of your program. Note however that you can in fact directly serialize or persist (fancy object oriented terms that basically means to save to permanent storage, e.g. disk) Python objects very easily with Python standard functionality, referred to in Python terms as pickling. See the pickle module for more information: http://docs.python.org/library/pickle.html Note that it is more common for applications to use a database for data storage, such as SQLite, Postgres, MySQL, SQL Server etc etc, rather than simple pickling, but for simple cases it (or even simple text files) might suffice. It all depends on your requirements... ;) Regards Walter ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Character Buffer Object Error
On 2/8/2012 12:56 AM, Michael Lewis wrote: I want to find all digits in a string and then increment those digits by 1 and then return the same string with the incremented digits. [snip] You got lots of good advice from others and some not-so-good advice. Michael said: 2. The following line appears wrong. new_output = ' '.join(user_input) He did not say why! I add: Master the art of Desk Checking. Take pencil paper. Write down the input and output of each statement as though you were the computer. Also learn to read the understand the Python Manuals: str.replace(old, new[, count]) Return a copy of the string with all occurrences of substring old replaced by new. If the optional argument count is given, only the first count occurrences are replaced. Notice return a copy. It does NOT say that this will convert old in place. No one else caught this problem! Since this is homework we we probably should not be offering alternative solutions. However I can't resist offering the one-line solution: ''.join(str(int(x)+1) if x.isdigit() else x for x in 'user_input) -- Bob Gailer 919-636-4239 Chapel Hill NC ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] general basic question
On 8 February 2012 13:40, ken brockman krush1...@yahoo.com wrote: Hello all: I have a general and very basic question if I may. I am in the process of attempting to write my first python app. I wanted to collect information and save it to lists and dictionaries. My question is, is it possible to save said lists and dictionaries in the program proper, or do i need to save the information to files on the hard drive. Python objects very easily with Python standard functionality, referred to in Python terms as pickling. See the pickle module for more information: http://docs.python.org/library/pickle.html Thank you Walter for your help and speedy reply. Using pickling I have somehow managed to save two separate lists, but the dictionary is giving me much more of a struggle. I will reference the link you were gracious enough to provide me. Hopefully a few pots of coffee and my last few remaining brain cells will get me through it. Thanks again... PS the last few times i had attempted reading the docs on the python site, well, I might as well have been reading a book in ancient Sanskrit. But if at first you don't succeed,try, try, try, again. Have a great day. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python editor
I'm using Spyder (http://code.google.com/p/spyderlib/) and Notepad++ on Windows. I don't like pycharm. This software is consuming too much resources witch for me is poinless. Pycharm can eat even 500MB+ of RAM for simple application. 2012/2/8 Jamie Paul Griffin ja...@kontrol.kode5.net On Mon, Feb 06, 2012 at 06:11:13PM +, Alan Gauld wrote: On 06/02/12 17:17, bob gailer wrote: On 2/6/2012 10:25 AM, Kapil Shukla wrote: Please also suggest a free editor for python which can at least repeat previous command with a key stroke That depends on the editor's mode of operation. In an editor like vi (elvis, vim etc) there is a repeat key (the period) that repeats most things because most things are a command - even inserting text. but in a so called modeless editor (most modern ones) repeat will be restricted to things that are recognised as atomic operations, like search/replace, change case etc. And some of those will only be valid when text is selected (so not really modeless!). Other editors like emacs allow you to specify how often an action is repeated. So esc-16 n will insert 16 n's for example. You would need to be more specific in terms of what you want in a repeat operation. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor !DSPAM:4f3018592251995719914! My personal choices are nvi for command line editor and TextMate for GUI on Mac OS X. I don't use Windows systems so haven't a clue what's on offer for that platform. I learned nvi just because it's the default editor installed on NetBSD base system which is my primary computing platform. There's just so many editors now it's difficult to know what will suit you best. It would mostly come down to the environment you are most comfortable working in; I spend 90% of my time in a UNIX shell so the command line editors suit me better. Jamie ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] how to change the current working directory path in ipython.
how to change the current working directory path in ipython. my current directory path is pwd Out[2]: u'C:\\Users\\as' now if i want to take the path to a subfolder of above 'C:\\Users\\as', what do i have to do? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] general basic question
Hi Ken, On 8 February 2012 14:17, ken brockman krush1...@yahoo.com wrote: Thank you Walter for your help and speedy reply. You're welcome. Using pickling I have somehow managed to save two separate lists, but the dictionary is giving me much more of a struggle. Well do post back if you don't manage to solve your issues (with full error messages stack traces as relevant please.) Re dictionaries -- I actually forgot to mention, there's a specialized type of dictionary class available in Python, called a shelf, implented/available via the shelve module, which is basically a dict with pickling built in. See here: http://docs.python.org/library/shelve.html HTH, Walter ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to change the current working directory path in ipython.
On Wed, Feb 8, 2012 at 9:24 AM, Debashish Saha silid...@gmail.com wrote:
how to change the current working directory path in ipython.
my current directory path is
pwd
Out[2]: u'C:\\Users\\as'
now if i want to take the path to a subfolder of above
'C:\\Users\\as', what do i have to do?
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Try looking here:
http://docs.python.org/tutorial/stdlib.html#operating-system-interface
There is a module in python called os
Here is an example from the documentation
import os
os.getcwd() # Return the current working directory
'C:\\Python26'
os.chdir('/server/accesslogs') # Change current working directory
os.system('mkdir today') # Run the command mkdir in the system shell
0
--
Joel Goldstick
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[Tutor] PyQT GUI Threading example
I can't find any full example of threading with many threads working and updating GUI (precisely i need QTreeWidget). I can only find: not updating GUI examples, updating GUI examples with one thread. But i just can't find what i need. Could anyone share working example with many threads updating GUI like for example connecting to several www sites and adding the response in a list on QTreeWidget? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python editor
On Wed, Feb 8, 2012 at 9:17 AM, R.S. zorean...@gmail.com wrote: I'm using Spyder (http://code.google.com/p/spyderlib/) and Notepad++ on Windows. I don't like pycharm. This software is consuming too much resources witch for me is poinless. Pycharm can eat even 500MB+ of RAM for simple application. 2012/2/8 Jamie Paul Griffin ja...@kontrol.kode5.net On Mon, Feb 06, 2012 at 06:11:13PM +, Alan Gauld wrote: On 06/02/12 17:17, bob gailer wrote: On 2/6/2012 10:25 AM, Kapil Shukla wrote: Please also suggest a free editor for python which can at least repeat previous command with a key stroke That depends on the editor's mode of operation. In an editor like vi (elvis, vim etc) there is a repeat key (the period) that repeats most things because most things are a command - even inserting text. but in a so called modeless editor (most modern ones) repeat will be restricted to things that are recognised as atomic operations, like search/replace, change case etc. And some of those will only be valid when text is selected (so not really modeless!). Other editors like emacs allow you to specify how often an action is repeated. So esc-16 n will insert 16 n's for example. You would need to be more specific in terms of what you want in a repeat operation. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor !DSPAM:4f3018592251995719914! My personal choices are nvi for command line editor and TextMate for GUI on Mac OS X. I don't use Windows systems so haven't a clue what's on offer for that platform. I learned nvi just because it's the default editor installed on NetBSD base system which is my primary computing platform. There's just so many editors now it's difficult to know what will suit you best. It would mostly come down to the environment you are most comfortable working in; I spend 90% of my time in a UNIX shell so the command line editors suit me better. I'm using vim with a number of plugins to turn the text editor into a Python IDE. Some of the setup highlights are: * code highlighting * syntax checking * code folding * and a whole bunch more For more information: http://sontek.net/turning-vim-into-a-modern-python-ide -Tino ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] confusion about scipy
ImportError Traceback (most recent call last) C:\Python27\lib\site-packages\IPython\utils\py3compat.pyc in execfile(fname, glob, loc) 166 else: 167 filename = fname -- 168 exec compile(scripttext, filename, 'exec') in glob, loc 169 else: 170 def execfile(fname, *where): C:\Users\as\hemanta\noorm.py in module() 1 import numpy as np 2 from scipy import brentq 3 import matplotlib.pyplot as plt 4 from pylab import twinx 5 from scipy.integrate import quad ImportError: cannot import name brentq Question: like 'from pylab import twinx' why could not i write 'from scipy import brentq'.Instead i have to write 'from scipy.optimize import brentq'.But why??? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] confusion about scipy
ImportError Traceback (most recent call last) C:\Python27\lib\site-packages\IPython\utils\py3compat.pyc in execfile(fname, glob, loc) 166 else: 167 filename = fname -- 168 exec compile(scripttext, filename, 'exec') in glob, loc 169 else: 170 def execfile(fname, *where): C:\Users\as\hemanta\noorm.py in module() 1 import numpy as np 2 from scipy import brentq 3 import matplotlib.pyplot as plt 4 from pylab import twinx 5 from scipy.integrate import quad ImportError: cannot import name brentq Question: like 'from pylab import twinx' why could not i write 'from scipy import brentq'.Instead i have to write 'from scipy.optimize import brentq'.But why??? Because that's where the scipy developers put the brentq function: in the optimize module. It's basically the same as your line 5, where quad is in the integrate module in the scipy package. It makes sense to organise a large library into (sub)packages/(sub)modules. Just as the tutorial shows as well: http://docs.python.org/tutorial/modules.html#packages The fact that twinx can be imported straight from the pylab module, is actually just a convenient shortcut. Evert ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] general basic question
Using pickling I have somehow managed to save two separate lists, but the dictionary is giving me much more of a struggle. Well do post back if you don't manage to solve your issues (with full error messages stack traces as relevant please.) Re dictionaries -- I actually forgot to mention, there's a specialized type of dictionary class available in Python, called a shelf, implented/available via the shelve module, which is basically a dict with pickling built in. See here: http://docs.python.org/library/shelve.html HTH, Walter Walter, you're the man. I've read of the shelve command. Not that i understood it, but i've read it. I'm going to hit the books and google some more before i waste anymore of your time. But if i can't sort it out, I may just take you up on your kind offer. Have a good day . Ken___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] general basic question
On Wed, Feb 8, 2012 at 12:33 PM, ken brockman krush1...@yahoo.com wrote: Using pickling I have somehow managed to save two separate lists, but the dictionary is giving me much more of a struggle. Well do post back if you don't manage to solve your issues (with full error messages stack traces as relevant please.) Re dictionaries -- I actually forgot to mention, there's a specialized type of dictionary class available in Python, called a shelf, implented/available via the shelve module, which is basically a dict with pickling built in. See here: http://docs.python.org/library/shelve.html HTH, Walter Walter, you're the man. I've read of the shelve command. Not that i understood it, but i've read it. I'm going to hit the books and google some more before i waste anymore of your time. But if i can't sort it out, I may just take you up on your kind offer. Have a good day . Ken ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor You might want to find some tutorials that suit you. On the right column of this site there is a list of several online: www.reddit.com/r/Python/ -- Joel Goldstick ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] dictionary of methods calling syntax
Alan Gauld wrote: Since a class is effectively a disguised dictionary I'm not sure why you want to do this? If you just want to access the method by name then why not just call getattr(spam,'get_mean')? Thanks for the feedback and, yes, this makes sense. My use case was when the statistic desired was going to be specified at runtime (through file input or UI) and that a dictionary would be a convenient crosswalk to associate the statistic name with the method name (and thus avoid an if/else ladder). But I understand that as long as there is a direct relationship between the name of the statistic and my class method (e.g. 'mean' - get_mean), that I should be able to use the getattr() syntax as above. Thanks also to Joel for the suggestion to put the dictionary inside of __init__. thanks, matt ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Python Database Scripting
Can someone provide information on the best modules/python tools to use for general database scripting? I'm interested in something that works across the board for Oracle, MySQL, MS SQL Server, and DB2. I was hoping a good generic ODBC module would be out there, but I'm having difficulty locating one that works for all. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python Database Scripting
The closest thing you'll find will probably be the third party module 'sqlalchemy'. You can install it via easy_install or pip. If that doesn't meet your needs I'm not sure what else would. (But would love to hear about it.) -Modulok- On 2/8/12, Brad Hudson brad.hud...@gmail.com wrote: Can someone provide information on the best modules/python tools to use for general database scripting? I'm interested in something that works across the board for Oracle, MySQL, MS SQL Server, and DB2. I was hoping a good generic ODBC module would be out there, but I'm having difficulty locating one that works for all. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] dictionary of methods calling syntax
On 08/02/2012 17:41, Gregory, Matthew wrote: Alan Gauld wrote: Since a class is effectively a disguised dictionary I'm not sure why you want to do this? If you just want to access the method by name then why not just call getattr(spam,'get_mean')? Thanks for the feedback and, yes, this makes sense. My use case was when the statistic desired was going to be specified at runtime (through file input or UI) and that a dictionary would be a convenient crosswalk to associate the statistic name with the method name (and thus avoid an if/else ladder). But I understand that as long as there is a direct relationship between the name of the statistic and my class method (e.g. 'mean' - get_mean), that I should be able to use the getattr() syntax as above. Thanks also to Joel for the suggestion to put the dictionary inside of __init__. thanks, matt ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor This should help if you need more info http://code.activestate.com/lists/python-list/403361/ -- Cheers. Mark Lawrence. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] (no subject)
On 07/02/2012 19:07, Hugo Arts wrote:
On Tue, Feb 7, 2012 at 7:50 PM, Debashish Saha silid...@gmail.com wrote:
for i in range(1, 8):
print(i)
if i==3:
break
else:
print('The for loop is over')
Output:
1
2
3
Question:but after breaking the for loop why the else command could not work?
because the else statement was designed to be that way:
http://docs.python.org/reference/compound_stmts.html#for
quoting the relevant part:
When the items are exhausted (which is immediately when the sequence
is empty), the suite in the else clause, if present, is executed, and
the loop terminates.
A break statement executed in the first suite terminates the loop
without executing the else clause’s suite.
in short, the else clause only executes if you do *not* break out of the loop.
I might be missing something but I can't see a reason for the else:
clause attached to the for statement, could anyone provide an example
where or why someone might use the else: clause with the for loop?
P.
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Re: [Tutor] Python Database Scripting
On 08/02/12 18:03, Brad Hudson wrote: Can someone provide information on the best modules/python tools to use for general database scripting? I'm interested in something that works across the board for Oracle, MySQL, MS SQL Server, and DB2. I was hoping a good generic ODBC module would be out there, but I'm having difficulty locating one that works for all. There are a few object-database wrappers such as SQLAlchemy that has been mentioned. But be aware that any such generic database wrapper will have compromises in performance/scalability. Every database has its own foibles and if you need power access you will need to use native access. The Python DBAPI is pretty standard but it also allows you to access the database features too. There is an ODBC wrapper too but of course ODBC adds yet another layer of limitations. Given the choice of using ODBC via Python DBAPI or using Sqlalchemy I'd probably go with SqlAlchemy. Either approach is valid, it just depends on whether performance/flexibility or compatibility/transparency matters most. You have to pick your poison. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python Database Scripting
Thanks for the responses Alan Modulok. I will start with SQLAlchemy and see where it takes me. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] general basic question
On Wed, Feb 8, 2012 at 12:33 PM, ken brockman krush1...@yahoo.com wrote: Using pickling I have somehow managed to save two separate lists, but the dictionary is giving me much more of a struggle. Got it. I manage to get it to save to disk, but only by using the shell to create an empty dictionary then pickling it and saving it to a file. Priming the pump as it were. I had thought i had read that when you pickle and save a list or dictionary to file, if it didn't already exist, it would be created. That hasn't been my experience. Had I misunderstood or Am i doing something wrong? Just for future reference. I'm as happy as the proverbial pig in excrement just to get it to function. Thanks all for your help. Ken___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python Database Scripting
Op 08-02-12 20:20, Brad Hudson schreef: Thanks for the responses Alan Modulok. I will start with SQLAlchemy and see where it takes me. I was looking for something similar a couple of months ago and chose to use SQLObject over SQLAlchemy. In my eyes it was much easier to use. Timo ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] general basic question
On Wed, Feb 8, 2012 at 2:57 PM, ken brockman krush1...@yahoo.com wrote: On Wed, Feb 8, 2012 at 12:33 PM, ken brockman krush1...@yahoo.com wrote: Using pickling I have somehow managed to save two separate lists, but the dictionary is giving me much more of a struggle. Got it. I manage to get it to save to disk, but only by using the shell to create an empty dictionary then pickling it and saving it to a file. Priming the pump as it were. I had thought i had read that when you pickle and save a list or dictionary to file, if it didn't already exist, it would be created. That hasn't been my experience. Had I misunderstood or Am i doing something wrong? Just for future reference. I'm as happy as the proverbial pig in excrement just to get it to function. Thanks all for your help. Ken Ken, Let me see if I understand your problem. You are pickling a dictionary and finding that it will not work unless there already is an existing dictionary for your pickled dictionary to write over. Otherwise, there is either no write at all or the write is followed by a delete. Is that a reasonable definition of your current problem? Robert Berman ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] general basic question
Got it. I manage to get it to save to disk, but only by using the shell to create an empty dictionary then pickling it and saving it to a file. Priming the pump as it were. I had thought i had read that when you pickle and save a list or dictionary to file, if it didn't already exist, it would be created. That hasn't been my experience. Had I misunderstood or Am i doing something wrong? Let me see if I understand your problem. You are pickling a dictionary and finding that it will not work unless there already is an existing dictionary for your pickled dictionary to write over. Otherwise, there is either no write at all or the write is followed by a delete. Is that a reasonable definition of your current problem? Robert Berman Really close to it Robert. No delete but an error msg. Something akin to file dosen't exist, not found , or words to that effect . Ken___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] general basic question
On Wed, Feb 8, 2012 at 4:28 PM, ken brockman krush1...@yahoo.com wrote: Got it. I manage to get it to save to disk, but only by using the shell to create an empty dictionary then pickling it and saving it to a file. Priming the pump as it were. I had thought i had read that when you pickle and save a list or dictionary to file, if it didn't already exist, it would be created. That hasn't been my experience. Had I misunderstood or Am i doing something wrong? Let me see if I understand your problem. You are pickling a dictionary and finding that it will not work unless there already is an existing dictionary for your pickled dictionary to write over. Otherwise, there is either no write at all or the write is followed by a delete. Is that a reasonable definition of your current problem? Robert Berman Really close to it Robert. No delete but an error msg. Something akin to file dosen't exist, not found , or words to that effect . Ken ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Ken, The best way to get help here is to post a small example of your code that shows the problem, along with the complete traceback. Although at first they seem a little daunting, the traceback will make the problem obvious -- Joel Goldstick ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] general basic question
On 08/02/12 21:28, ken brockman wrote: Really close to it Robert. No delete but an error msg. Something akin to file dosen't exist, not found , or words to that effect . Without sight of code it's only a guess but are you creating the file with the 'wb' mode - ie. write binary? :- myPickleFile = open(somefilename.dat, wb) If you are not using the 'b' for binary pickle and shelve tend to run into problems, this might be one of those cases. Its not glaringly obvious from the docs that you need to use binary mode and beginners often get caught out. Could that be it? -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] (no subject)
On Wed, Feb 8, 2012 at 2:04 PM, Patrick Dempster
pa...@paddy-dempster.org.uk wrote:
On 07/02/2012 19:07, Hugo Arts wrote:
On Tue, Feb 7, 2012 at 7:50 PM, Debashish Saha silid...@gmail.com wrote:
for i in range(1, 8):
print(i)
if i==3:
break
else:
print('The for loop is over')
Output:
1
2
3
Question:but after breaking the for loop why the else command could not
work?
because the else statement was designed to be that way:
http://docs.python.org/reference/compound_stmts.html#for
quoting the relevant part:
When the items are exhausted (which is immediately when the sequence
is empty), the suite in the else clause, if present, is executed, and
the loop terminates.
A break statement executed in the first suite terminates the loop
without executing the else clause’s suite.
in short, the else clause only executes if you do *not* break out of the
loop.
I might be missing something but I can't see a reason for the else:
clause attached to the for statement, could anyone provide an example
where or why someone might use the else: clause with the for loop?
P.
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Here is and interesting article:
http://nedbatchelder.com/blog/201110/forelse.html
The else clause runs if the loop breaks for some reason. So you would
use it only to do some processing if the loop completes completely.
--
Joel Goldstick
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[Tutor] For/else construct was: Re: (no subject)
On 08/02/12 19:04, Patrick Dempster wrote: I might be missing something but I can't see a reason for the else: clause attached to the for statement, could anyone provide an example where or why someone might use the else: clause with the for loop? There have been a couple of sample cases given already but here is an example of what you would need to do without it. broken_loop = False for item in collection: process(item) if condition: broken_loop = True break if not broken_loop: do_the_else_part() do_this_regardless() It's not a huge pain but this is easier: for item in collection: process(item) if condition: break else: do_the_else_part() do_this_regardless() HTH, -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] (no subject)
On Wed, Feb 8, 2012 at 5:21 PM, Joel Goldstick joel.goldst...@gmail.comwrote: The else clause runs if the loop breaks for some reason. So you would use it only to do some processing if the loop completes completely. No. The else clause only runs if the loop does NOT break out early. The else clause only runs if the loop runs to completion without breaking. For what it's worth, I loathe for/else loops, and will probably never use them in my code. They confuse me every time I see them, and I have to go look up the behavior. My brain always jumps to the conclusion that the else clause should run when we do hit a break, which is the exact opposite of how it actually works. Maybe if they had been written into the language as for/then loops I would remember it correctly. Jerry ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] (no subject)
On Wed, Feb 8, 2012 at 6:00 PM, Jerry Hill malaclyp...@gmail.com wrote: On Wed, Feb 8, 2012 at 5:21 PM, Joel Goldstick joel.goldst...@gmail.com wrote: The else clause runs if the loop breaks for some reason. So you would use it only to do some processing if the loop completes completely. No. The else clause only runs if the loop does NOT break out early. The else clause only runs if the loop runs to completion without breaking. For what it's worth, I loathe for/else loops, and will probably never use them in my code. They confuse me every time I see them, and I have to go look up the behavior. My brain always jumps to the conclusion that the else clause should run when we do hit a break, which is the exact opposite of how it actually works. Maybe if they had been written into the language as for/then loops I would remember it correctly. Jerry ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor oops.. sorry.. yes else runs if the loop completes without a break.. duh! -- Joel Goldstick ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] general basic question
ken brockman wrote: Really close to it Robert. No delete but an error msg. Something akin to file dosen't exist, not found , or words to that effect . Something akin to? How about if you copy and paste the actual error message, instead of asking us to guess? That means the full traceback, starting at the line Traceback (most recent call last) all the way to the end. It may also help if you show us the code that you are running, again instead of making us guess. But before you do, please read this document: http://sscce.org/ -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] This program has worked for me before.
Hello, I stopped using python for about 4 months but now I am back. I tried running my pizza_panic_game.py program again thinking nothing had changed since a last ran it but boy was I wrong. Are we allowed to send the program as an attachment? Here is the program # Pizza Panic # Player must catch falling pizzas before they hit the ground from livewires import games, color import random games.init(screen_width = 640, screen_height = 480, fps =50) class Pan(games.Sprite): A pan controlled by player to catch falling pizzas. image = games.load_image(pan.bmp) def __init__(self): Initializing Pan object and create Text object for score. super(Pan, self).__init__(image = Pan.image, x = games.mouse.x, bottom = games.screen.height) self.score = games.Text(value = 0, size = 25, color = color.black, top = 5, right = games.screen.width - 10) games.screen.add(self.score) def update(self): Move to mouse x position. self.x = games.mouse.x if self.left 0: self.left = 0 if self.right games.screen.width: self.right = games.screen.width self.check_catch() def check_catch(self): Check if catch pizzas. for pizza in self.overlapping_sprites: self.score.value += 10 self.score.right = games.screen.width - 10 pizza.handle_caught() class Pizza(games.Sprite): A pizza which falls to the ground. image = games.load_image(pizza.bmp) speed = 1 def __init__(self, x, y = 90): Initialize a Pizza object. super(Pizza, self).__init__(image = Pizza.image, x = x, y = y, dy = Pizza.speed) def update(self): Check if bottom edge has reached screen bottom. if self.bottom games.screen.height: self.end_game() self.destroy() def handle_caught(self): Destroy self if caught. self.destroy() def end_game(self): End the game. end_message = games.Message(value = Game Over, size = 90, color = color.red, x = games.screen.width/2, y = games.screen.height/2, lifetime = 5 * games.screen.fps, after_death = games.screen.quit) games.screen.add(end_message) class Chef(games.Sprite): A chef which moves left and right, dropping pizzas. image = games.load_image(chef.bmp) def __init__(self, y = 55, speed = 2, odds_change = 200): Initialize the Chef object. super(Chef, self).__init__(image = Chef.image, x = games.screen.width / 2, y = y, dx = speed) self.odds_change = odds_change self.time_til_drop = 0 def update(self): Determined if direction needs to be reversed. if self.left 0 or self.right games.screen.width: self.dx = -self.dx elif random.randrange(self.odds_change) == 0: self.dx = -self.dx self.check_drop() def check_drop(self): Decrease countdown or drop pizza and reset countdown. if self.time_til_drop 0: self.time_til_drop -= 1 else: new_pizza = Pizza(x = self.x) games.screen.add(new_pizza) # set buffer to approx 30% of pizza height, regardless of pizza speed self.time_til_drop = int(new_pizza.height * 1.3 / Pizza.speed) + 1 def main(): Play the game. wall_image = games.load_image(wall.jpg, transparent = False) games.screen.background = wall_image the_chef = Chef() games.screen.add(the_chef) the_pan = Pan() games.screen.add(the_pan) games.mouse.is_visible = False games.screen.event_grab = True games.screen.mainloop() # start it up! main() and it keeps giving me this error message which I then googled to no avail Traceback (most recent call last): File C:\Python31\pizza_panic_game.py, line 4, in module from livewires import games, color File C:\Python31\lib\site-packages\livewires\games.py, line 57, in module import pygame, pygame.image, pygame.mixer, pygame.font, pygame.transform File C:\Python31\lib\site-packages\pygame\__init__.py, line 95, in module from pygame.base import * ImportError: DLL load failed: The specified module could not be found. thanks for the help. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] bogus characters in a windows file
I'm reading a file output by the system utility WMIC in windows (so I can track
CPU usage by process ID) and the text file WMIC outputs seems to have extra
characters in I've not seen before.
I use os.system('WMIC /OUTPUT:c:\cpu.txt PROCESS GET ProcessId') to output the
file and parse file c:\cpu.txt
The first few lines of the file look like this in notepad
ProcessId
0
4
568
624
648
I input the data with the lines
infile = open('c:\cpu.txt','r')
infile.readline()
infile.readline()
infile.readline()
the readline()s yield the following output
'\xff\xfeP\x00r\x00o\x00c\x00e\x00s\x00s\x00I\x00d\x00 \x00 \x00\r\x00\n'
'\x000\x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00\r\x00\n'
'\x004\x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00\r\x00\n'
Now for the first line the title 'ProcessId' is in this string but the
individual characters are separated by '\x00' and at least for the first line
of the file there is an extra '\xff\xfe'. For subsequent its just '\x00. Now I
can just replace the '\x**' with '' but that seems a bit inelegant. I've tried
various options on the open 'rU' and 'rb' but no effect.
Does anybody know what the rubbish characters are and what has caused the. I'm
using the latest Enthought python if that matters.
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Re: [Tutor] bogus characters in a windows file
On Wed, Feb 8, 2012 at 5:46 PM, Garry Willgoose
garry.willgo...@newcastle.edu.au wrote:
I'm reading a file output by the system utility WMIC in windows (so I can
track CPU usage by process ID) and the text file WMIC outputs seems to have
extra characters in I've not seen before.
I use os.system('WMIC /OUTPUT:c:\cpu.txt PROCESS GET ProcessId') to output
the file and parse file c:\cpu.txt
The first few lines of the file look like this in notepad
ProcessId
0
4
568
624
648
I input the data with the lines
infile = open('c:\cpu.txt','r')
infile.readline()
infile.readline()
infile.readline()
the readline()s yield the following output
'\xff\xfeP\x00r\x00o\x00c\x00e\x00s\x00s\x00I\x00d\x00 \x00 \x00\r\x00\n'
'\x000\x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00\r\x00\n'
'\x004\x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00\r\x00\n'
Now for the first line the title 'ProcessId' is in this string but the
individual characters are separated by '\x00' and at least for the first
line of the file there is an extra '\xff\xfe'. For subsequent its just
'\x00. Now I can just replace the '\x**' with '' but that seems a bit
inelegant. I've tried various options on the open 'rU' and 'rb' but no
effect.
Does anybody know what the rubbish characters are and what has caused the.
I'm using the latest Enthought python if that matters.
You're trying to read a Unicode text file byte-by-byte. It'll end in
tears...
The \xff\xfe at the beginning is the Byte Order Marker or BOM.
Here's a quick primer on Unicode:
http://www.joelonsoftware.com/articles/Unicode.html
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Re: [Tutor] bogus characters in a windows file
On 02/08/2012 08:46 PM, Garry Willgoose wrote:
I'm reading a file output by the system utility WMIC in windows (so I can track
CPU usage by process ID) and the text file WMIC outputs seems to have extra
characters in I've not seen before.
I use os.system('WMIC /OUTPUT:c:\cpu.txt PROCESS GET ProcessId') to output the
file and parse file c:\cpu.txt
First mistake. If you use backslash inside a python literal string, you
need to do one of two things:
1) use a raw string
2) double the backslash
It so happens that \c is not a python escape sequence, so you escaped
this particular bug.
The first few lines of the file look like this in notepad
ProcessId
0
4
568
624
648
I input the data with the lines
infile = open('c:\cpu.txt','r')
Same thing. You should either make it r'c:\cpu.txt' or
'c:\\cpu.txt' or even 'c:/cpu.txt'
infile.readline()
infile.readline()
infile.readline()
OK, so you throw away the first 3 lines of the file.
the readline()s yield the following output
'\xff\xfeP\x00r\x00o\x00c\x00e\x00s\x00s\x00I\x00d\x00 \x00 \x00\r\x00\n'
'\x000\x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00\r\x00\n'
'\x004\x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00\r\x00\n'
Now, how did you get those bytes displayed; they've already been thrown
out.
Now for the first line the title 'ProcessId' is in this string but the
individual characters are separated by '\x00' and at least for the first line
of the file there is an extra '\xff\xfe'. For subsequent its just '\x00. Now I
can just replace the '\x**' with '' but that seems a bit inelegant. I've tried
various options on the open 'rU' and 'rb' but no effect.
Does anybody know what the rubbish characters are and what has caused the. I'm
using the latest Enthought python if that matters.
It matters, but it'd save each of us lots of trouble if you told us what
version that was; especially which version of Python. The latest
Enthought I see is called EPD 7.2. But after 10 minutes on the site, I
can't see whether there actually is a Python on there or not. it seems
to be just a bunch of libraries for Python. But whether they're for
CPython, IronPython, or something else, who knows?
I don't see any rubbish characters. What I see is some unicode strings,
displayed as though they were byte strings. the first two bytes are the
BOM code, commonly put at the beginning of a file encoded in UTF-16.
The remaining pairs of bytes are UTF-16 encodings for ordinary
characters. Notepad would recognize the UTF-16 encoding, and display
the characters correctly. Perhaps you need to do the same.
You showed us a fragment of code which would throw away the first 3
lines of the file. You don't show us any code indicating what you mean
by yield the following output.
So you want us to read your mind, and tell you what's there?
--
DaveA
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Re: [Tutor] bogus characters in a windows file
On Wed, Feb 8, 2012 at 6:09 PM, Marc Tompkins marc.tompk...@gmail.comwrote:
On Wed, Feb 8, 2012 at 5:46 PM, Garry Willgoose
garry.willgo...@newcastle.edu.au wrote:
I'm reading a file output by the system utility WMIC in windows (so I can
track CPU usage by process ID) and the text file WMIC outputs seems to have
extra characters in I've not seen before.
I use os.system('WMIC /OUTPUT:c:\cpu.txt PROCESS GET ProcessId') to
output the file and parse file c:\cpu.txt
The first few lines of the file look like this in notepad
ProcessId
0
4
568
624
648
I input the data with the lines
infile = open('c:\cpu.txt','r')
infile.readline()
infile.readline()
infile.readline()
the readline()s yield the following output
'\xff\xfeP\x00r\x00o\x00c\x00e\x00s\x00s\x00I\x00d\x00 \x00 \x00\r\x00\n'
'\x000\x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00\r\x00\n'
'\x004\x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00 \x00\r\x00\n'
Now for the first line the title 'ProcessId' is in this string but the
individual characters are separated by '\x00' and at least for the first
line of the file there is an extra '\xff\xfe'. For subsequent its just
'\x00. Now I can just replace the '\x**' with '' but that seems a bit
inelegant. I've tried various options on the open 'rU' and 'rb' but no
effect.
Does anybody know what the rubbish characters are and what has caused
the. I'm using the latest Enthought python if that matters.
You're trying to read a Unicode text file byte-by-byte. It'll end in
tears...
The \xff\xfe at the beginning is the Byte Order Marker or BOM.
Here's a quick primer on Unicode:
http://www.joelonsoftware.com/articles/Unicode.html
In particular, this phrase:
we decided to do everything internally in UCS-2 (two byte) Unicode, which
is what Visual Basic, COM, and Windows NT/2000/XP use as their native
string type.
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Re: [Tutor] This program has worked for me before.
On 09/02/12 00:43, Nathaniel Trujillo wrote: Hello, I stopped using python for about 4 months but now I am back. I and it keeps giving me this error message which I then googled to no avail Traceback (most recent call last): File C:\Python31\pizza_panic_game.py, line 4, in module from livewires import games, color File C:\Python31\lib\site-packages\livewires\games.py, line 57, in module import pygame, pygame.image, pygame.mixer, pygame.font, pygame.transform File C:\Python31\lib\site-packages\pygame\__init__.py, line 95, in module from pygame.base import * ImportError: DLL load failed: The specified module could not be found. thanks for the help. Looks like a problem with your Livewires installation. Have you upgraded either Python or Livewires? Or deleted either? I'd start by reinstalling the correct matching version of Livewires. ie the one that matches your version of Python. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] What the difference between the two RE?
import re re.match(^hello, hello) re.match(hello, hello) Please give a string that matches RE ^hello but does not match RE hello, or matches RE hello but does not match RE ^hello. daedae11___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What the difference between the two RE?
On 2012/02/09 08:15 AM, daedae11 wrote: import re re.match(^hello, hello) re.match(hello, hello) Please give a string that matches RE ^hello but does not match RE hello, or matches RE hello but does not match RE ^hello. daedae11 ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor The caret ^ means At the beginning of the line so 'And they said hello' will not be matched by the regex pattern '^hello'. The docs are pretty good on the module http://docs.python.org/library/re.html http://docs.python.org/howto/regex.html -- Christian Witts Python Developer // ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What the difference between the two RE?
On 2012-02-09 08.16, Christian Witts wrote: On 2012/02/09 08:15 AM, daedae11 wrote: import re re.match(^hello, hello) re.match(hello, hello) Please give a string that matches RE ^hello but does not match RE hello, or matches RE hello but does not match RE ^hello. daedae11 ___ Tutor maillist -Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor The caret ^ means At the beginning of the line so 'And they said hello' will not be matched by the regex pattern '^hello'. The docs are pretty good on the module http://docs.python.org/library/re.html http://docs.python.org/howto/regex.html -- Christian Witts Python Developer This is also a good source of information for regexp patterns in general: http://www.regular-expressions.info/ Göran Törnquist Usertime ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] (no subject)
Really close to it Robert. No delete but an error msg. Something akin to file
dosen't exist, not found , or words to that effect .
Something akin to?
How about if you copy and paste the actual error message, instead of asking us
to guess?
Have been all afternoon'
That means the full traceback, starting at the line Traceback (most recent
call last) all the way to the end.
I have been trying to post all afternoon to no avail. I keep getting bounced
back...As per instructions from the list i have resubmitted my original request
20 times. Not sure of this one will get through either but here goes.
As i had written 20 times before, the issue is resolved, as such no error
msgs, but will try to replicated it, I seem pretty good at generating error
msg.: Take 15: sigh,,
def General_info():
file4 = open(Genfacts.p, rb)
Ginfo = pickle.load(file4)
file4.close()
print('General Information: ')
GinfoKey = input('CatKey: ')
GinfoFact = input('Info: ')
Ginfo[GinfoKey] = GinfoFact # add new key:fact
file4 = open(Genfacts.p, wb)
pickle.dump(Ginfo, file4)
file4.close()
return(Ginfo)
thanks for the good folks who have tried to help.
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[Tutor] general basic question
Really close to it Robert. No delete but an error msg. Something akin to file
dosen't exist, not found , or words to that effect .
Something akin to?
I'm back on the list again, and if not too late, here is the asked for trace.
i've managed to replicate the original error msg, by removing the pickled file
Genfacts.p, from the directory.
Traceback (most recent call last):
File /home/bob/Ninja/ArtyNOW2.py, line 120, in module
Ginfo = General_info()
File /home/bob/Ninja/ArtyNOW2.py, line 69, in General_info
file4 = open(Genfacts.p, rb)
IOError: [Errno 2] No such file or directory: 'Genfacts.p'
elif choice == g:
Ginfo = General_info()
print('General Info is: ',Ginfo)
# espeak routine General info
text = 'General Info is ', Ginfo
cmd = 'espeak -v en+f3 {0} 2/dev/null'.format(text)
os.system(cmd)
elif choice == p: # Alt. choice != q: incase anything uexpectd inputed
Thanks again
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