Re: [Tutor] Help regarding lists, dictionaries and tuples (bob gailer)
Robert Sjöblom robert.sjob...@gmail.com wrote
Why would you want to sum them? You start with 30 points in the
pool,
then allocate them to the attributes. The sum will still be 30.
Because the user should be able to spend 30 points, or remove points
from an attribute and get them back in the pool. Like so:
attributes { Strength : 0, Health : 0, Wisdom : 0, Dexterity
: 0)
points = 30 - sum(attributes.values())
Or is there a better way to achieve the same result?
If you write a couple of functions to add/remove points then they can
ensure that the total is correct without the need to sum the values.
attributes { Strength : 0, Health : 0, Wisdom : 0, Dexterity :
0)
points = 30 - sum(attributes.values())
def addPoints(attribute, number):
attributes[attribute] += number
points -= number
return points
def removePoints(attribute, number):
return addPoints(attribute, -number)
Now you can add and remove the points and the function will
ensure there are only ever 30 points in total use. You would
really need checks to ensure the attribute values and points
never went negative of course... but you need that anyway.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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Re: [Tutor] if n % 2 == 0 vs. if not n % 2 compared for speed: aesthetics lose
On Tue, Nov 23, 2010 at 20:09, R. Alan Monroe amon...@columbus.rr.com wrote: I've always disliked using if not n % 2 to test for even/odd ints because of its convoluted logic. But I ran some speed tests and found it was the way to go over if n % 2 == 0. Did you try bitwise-and with 1? What's that? 2 1 0 3 1 1 So what's the connection with the tests I've run? I'm wagering it will be faster than a modulo operation. Let us know how it turns out :) You'd win. See http://tutoree7.pastebin.com/QPT9cAEf My thanks to Emile for the list comprehension suggestion. Dick ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IDEs
Great. Thanks Eike and Alan. Josep M. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Working with interactive Python shell
Hi, When a thread gets too long and new subtopics appear it gets pretty hard to keep track of what has been said by whom and what has been answered. Anyway, in one of the threads I started, Steven d'Aprano gave me a very nice response telling me what his preferred working environment was. This prompted the following question from me which was not answered due to the fact that was one of the many subtopics that emerged from the original question. I'm still interested in finding out about this in case anybody can give me an answer. I reproduce my question to Steve: --- One question for Steve (or for whoever wants to answer): you say you have a terminal with two tabs (neat, I wonder whether I can get tabs as well for my terminal in OS X) and when you need to do debugging you turn to your interactive python terminal and do; import filename # first time only reload(filename) # all subsequent times If I do this with a normal python file (filename.py), I get the error: ImportError: No module named py This is if I enter the file name with the .py extension. If I just enter the file name without the extension, everything seems to work fine and I don't get any error message but then when I call a variable I get a message saying 'X' is not defined. -- I'm wondering whether I'm doing something wrong or whether I didn't properly understand what Steve was saying about working with the interactive Python shell. If I understood correctly, one can import a Python script into the interactive shell (not just modules) and then test different things from the prompt. I've tried to import various files following Steve's instructions but I get the errors I describe above. Josep M. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Working with interactive Python shell
snip intro --- One question for Steve (or for whoever wants to answer): you say you have a terminal with two tabs (neat, I wonder whether I can get tabs as well for my terminal in OS X) In Terminal.app, just type command-T and you get a new tab. Switch with the mouse or command-shift-[ command-shift-] But sometimes, two separate terminals can be more convenient, so you can see both at the same time. and when you need to do debugging you turn to your interactive python terminal and do; import filename # first time only reload(filename) # all subsequent times If I do this with a normal python file (filename.py), I get the error: ImportError: No module named py You're not really showing what exactly you type. That's often more clearer than describing what you do, although in this case we can get a pretty good picture anyway. This is if I enter the file name with the .py extension. Perhaps try and read through the module section of the standard Python tutorial: http://docs.python.org/tutorial/modules.html The .py extension just signifies the file is a Python file, but the actual module name comes before the extension. The dot in module names is to divide modules up into submodules, or package things (further down in the Python tutorial on modules). If I just enter the file name without the extension, everything seems to work fine and I don't get any error message but then when I call a variable I get a message saying 'X' is not defined. How do you 'call the variable'? Btw, you don't really call a variable: access would probably be a more accurate term imo. You would call a function though (and that function would then be executed). But if you call a variable that is defined inside the module, you'll need to prepend the module name, like: import mymodule mymodule.X This is actually a form of namespacing: X is not defined in your global environment, just in mymodule. And again, see the examples in the tutorial. -- I'm wondering whether I'm doing something wrong or whether I didn't properly understand what Steve was saying about working with the interactive Python shell. If I understood correctly, one can import a Python script into the interactive shell (not just modules) and then test different things from the prompt. Yes, correct. I've tried to import various files following Steve's instructions but I get the errors I describe above. Ok, I don't have Steve's instructions handy (they've been stripped of this thread now), but I assume that if you apply the above, you should get a bit further. But without actually showing us what you've typed and the errors, we can't give you concrete advice (copy-paste is often a very good idea). Btw, should you want to delve further into using the interactive prompt, there are various interactive prompts that provide more conveniences than the standard Python prompt. IPython is my favourite, but before you do that, try and use the default prompt. Good luck, Evert ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IDEs
Alan Gauld wrote: The basic idea in testing is to try to break your code. Try to think of every kind of evil input that could possibly come along and see if your code survives. In amongst all of that you should have a some valid values too, and know what to expect as out put. Testing is more than just trying to break code of course. I'm reminded of a quote: I find it amusing when novice programmers believe their main job is preventing programs from crashing. ... More experienced programmers realize that correct code is great, code that crashes could use improvement, but incorrect code that doesn't crash is a horrible nightmare. -- Chris Smith Testing is an attempt to ensure that code is *correct* -- that it does what it is supposed to do. There are a number of different types of tests, with different purposes. Unit tests are for testing that code behaves as expected. If you give the function this input, this will be its result. (The result might be to return a value, or it might be to raise an exception.) If you have a function that's supposed to add two numbers, it's important to be sure that it actually, ya know, *adds two numbers*, and not something else. (It *almost* adds them, it's just that sometimes the answer is off by one or two...) Doctests are examples that you put into the documentation (usually into docstrings of functions and methods). Their primary purpose is to be examples for the reader to read, but the secondary aspect is that you can run the examples and be sure that they actually work as they are supposed to work. Regression tests are to prevent bugs from re-occurring. For example, suppose you have a function spam() and you discover it fails for one particular input, aardvark. The first thing you should do, before even fixing the bug, is write a test: assert spam(aardvark) == expected result This test will fail, because there's a bug in spam(). Now go ahead and fix the bug, and the test will then pass. If your code ever has a *regression* that returns the bug in spam(), the test will fail again and you will immediately notice. Regression tests are to prevent fixed bugs from returning. User Acceptance Tests are mostly relevant when you're building software for a client. Both parties need a way to know when the software is done. Of course software is never done, but if you're charging $1 for a software project, you need to have way of saying This is where we stop, if you want us to continue, it will cost you more. UATs give both parties an objective way of telling that the promised functionality is there (e.g. if the user clicks the Stop button, processing must stop within one second) and identifying bugs and/or areas that weren't specified in enough detail. Of course, all of these are fuzzy categories -- there's no hard line between them. Test Driven Development tends to focus on the more normal inputs in my experience, but done properly your test code will usually be bigger than your production code. In a recent project that we completed we had 600k lines of production code and over a million lines of test code. I can well believe that. I've had a look at a couple of my projects (*much* smaller than 600 KLOC!) and I'm averaging about 800 lines in the test suite per 1000 lines in the project. That's an over-estimate: the 1000 lines includes doc tests, so should be counted towards the tests. Taking that into account, I get (very roughly) 1:1 ratio of test code to production code. And we still wound up with over 50 reported bugs during Beta test... But that was much better than the 2000 bugs on an earlier project :-) But testing is hard. Maybe so, but nothing beats running your test suite and seeing everything pass! -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Working with interactive Python shell
Josep M. Fontana wrote: One question for Steve (or for whoever wants to answer): you say you have a terminal with two tabs (neat, I wonder whether I can get tabs as well for my terminal in OS X) and when you need to do debugging you turn to your interactive python terminal and do; import filename # first time only reload(filename) # all subsequent times If I do this with a normal python file (filename.py), I get the error: ImportError: No module named py You're probably writing: import filename.py instead of just: import filename When you import a module, it doesn't necessarily come from a .py file. It could come from a pre-compiled .pyc or .pyo file, or from a Windows .pyw file, or a .dll or .so compiled C library, or out of a zip file, to mention just a few. There are many different possibilities. So Python expects you to just give the module name, filename, without the file extension, and it will search for the correct file regardless of the extension. Python uses the dot notation for packages. import filename.py looks for a module called py inside a package called filename. Since it doesn't find one, it raises ImportError. This is if I enter the file name with the .py extension. If I just enter the file name without the extension, everything seems to work fine and I don't get any error message but then when I call a variable I get a message saying 'X' is not defined. Please show the actual line of code you use, and the actual error message, in full, copied and pasted, and not retyped from memory, or paraphrased, or simplified, or otherwise changed in any way. -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Working with interactive Python shell
Thanks Evert and Steve, Both of you are right when you say: You're not really showing what exactly you type. That's often more clearer than describing what you do, although in this case we can get a pretty good picture anyway. OK, here's what I do: import test I know the shell is importing the file because I can see the following message: module 'test' from 'test.py' The file test.py has the following contents (this is a little line of code I constructed to see how the interactive shell worked importing the file): words = 'in the garden on the bank behind the tree'.split() How do you 'call the variable'? Sorry, you are right. That was a sloppy use of the term 'call'. I meant to say print the variable. When I do: print words and print words[3] In principle I should get: ['in', 'the', 'garden', 'on', 'the', 'bank', 'behind', 'the', 'tree'] and on What I do get is: Traceback (most recent call last): File stdin, line 1, in module NameError: name 'words' is not defined If the file has the contents that I showed above (and it does), 'words' should be defined, shouldn't it? By the way Evert, thanks also for the tip on how to get tabs on a Mac terminal. I didn't know that. Josep M. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Working with interactive Python shell
You're not really showing what exactly you type. That's often more clearer than describing what you do, although in this case we can get a pretty good picture anyway. OK, here's what I do: import test I know the shell is importing the file because I can see the following message: module 'test' from 'test.py' The file test.py has the following contents (this is a little line of code I constructed to see how the interactive shell worked importing the file): words = 'in the garden on the bank behind the tree'.split() How do you 'call the variable'? Sorry, you are right. That was a sloppy use of the term 'call'. I meant to say print the variable. When I do: print words and print words[3] In principle I should get: ['in', 'the', 'garden', 'on', 'the', 'bank', 'behind', 'the', 'tree'] and on What I do get is: Traceback (most recent call last): File stdin, line 1, in module NameError: name 'words' is not defined If the file has the contents that I showed above (and it does), 'words' should be defined, shouldn't it? Then you haven't read my previous response carefully enough, or I haven't phrased it properly. The example I gave was: import mymodule mymodule.X where X is defined in a file called mymodule.py In your case, replace mymodule with test, and X with words. Also, really, read the tutorial on modules. I know we tutor here, but those tutorials are there to explain the most common cases (and the standard Python tutorial isn't the only tutorial, but since it comes with Python, it's the one I generally point to). Of course, if something is unclear in the tutorial, let us know! Cheers, Evert ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Working with interactive Python shell
On Wed, Nov 24, 2010 at 3:00 PM, Evert Rol evert@gmail.com wrote: Then you haven't read my previous response carefully enough, or I haven't phrased it properly. The example I gave was: import mymodule mymodule.X where X is defined in a file called mymodule.py In your case, replace mymodule with test, and X with words. No, you had phrased it perfectly. I just read your answer too fast. My bad. Also, really, read the tutorial on modules. I know we tutor here, but those tutorials are there to explain the most common cases (and the standard Python tutorial isn't the only tutorial, but since it comes with Python, it's the one I generally point to). Of course, if something is unclear in the tutorial, let us know! You are right. I didn't read the link because I assumed it would be general information about modules and I didn't connect that with the problem I was having using the interactive shell. No I checked it and saw that, in fact, the relevant information was right there in the first paragraphs. My apologies. Thanks for your help. Josep M. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] If os.path.lexists() isn't working properly
Hello memebers:
I'm writing a python script to validate if files with extension .prj exist,
if they exist it should write 1 or 0 into an excel cell. I've working to do
this properly, but I'm not getting the results I need. The script doesn't
find all the files, is like the files don't exist but they exist, besides I
think is just reading some of the files that are in C:\Python 26. I really
need a hand on this.
import os, time, socket, pylab
from xlwt import Workbook
from osgeo import ogr,gdal,osr
from dbf import *
#Register GAL drivers
gdal.AllRegister()
#Create an empty list
file_list = []
folders = None
#Code to indicate directory
for root, folders, files in os.walk( C:\\ ):
file_list.extend(os.path.join(root,fi) for fi in files if
fi.endswith(.shp))
#Open excel book
wrkbk = Workbook()
#Add excel sheet
wksht = wrkbk.add_sheet('shp')
wksht.row(0).write(0,'ruta')
wksht.row(0).write(1,'archivo')
wksht.row(0).write(2,'prj')
for row, filepath in enumerate(file_list, start=1):
wksht.row(row).write(0, filepath)
(ruta, filename) = os.path.split(filepath)
wksht.row(row).write(1, filename)
n = os.path.splitext(filename)
p = n[0]+'.prj'
if os.path.lexists(p):
wksht.row(row).write(2, 1)
else:
wksht.row(row).write(2, 0)
wrkbk.save('shp3.xls')
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Re: [Tutor] Fw: Installing Pyserial for Python27 on Win 7
Hi, Walter - Thanks to you, pyserial is installed and imports into Python. Not having double backslashes was the latest problem that you got me through. I am grateful for the support and education you have given me. Cheers, John ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] If os.path.lexists() isn't working properly
Susana Iraiis Delgado Rodriguez wrote:
Hello memebers:
I'm writing a python script to validate if files with extension .prj
exist, if they exist it should write 1 or 0 into an excel cell. I've
working to do this properly, but I'm not getting the results I need. The
script doesn't find all the files, is like the files don't exist but they
exist, besides I think is just reading some of the files that are in
C:\Python 26. I really need a hand on this.
import os, time, socket, pylab
from xlwt import Workbook
from osgeo import ogr,gdal,osr
from dbf import *
#Register GAL drivers
gdal.AllRegister()
#Create an empty list
file_list = []
folders = None
#Code to indicate directory
for root, folders, files in os.walk( C:\\ ):
file_list.extend(os.path.join(root,fi) for fi in files if
fi.endswith(.shp))
#Open excel book
wrkbk = Workbook()
#Add excel sheet
wksht = wrkbk.add_sheet('shp')
wksht.row(0).write(0,'ruta')
wksht.row(0).write(1,'archivo')
wksht.row(0).write(2,'prj')
for row, filepath in enumerate(file_list, start=1):
wksht.row(row).write(0, filepath)
(ruta, filename) = os.path.split(filepath)
wksht.row(row).write(1, filename)
n = os.path.splitext(filename)
p = n[0]+'.prj'
Add
print looking for, p
here. Does it show what you expect/want? In what directory will lexists()
look for the file?
if os.path.lexists(p):
lexists()' claim to fame is that it Returns True for broken symbolic
links. Are you sure you prefer that over good old os.path.exists()?
wksht.row(row).write(2, 1)
else:
wksht.row(row).write(2, 0)
wrkbk.save('shp3.xls')
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Re: [Tutor] Lambda function, was: Simple counter to determine frequencies of words in adocument
Notice that it uses key as a function inside sorted. And lambda creates a function so sorted applies the lambda to each item in turn to retrieve the sort key. OK. I get it. Thanks a lot. This should have been clear if I had been able to see the code for the sorted() method. OK Good, But I stress the code I posted bears no relation to the actual code for sorted! It was purely illustrative. Can anyone point me to a URL (or some other document) where the code for the different built-in methods can be examined? The source code for Python, including all the standard modules and the builtin stuff is available on the web site to view or download. (The joy of Opensource.) Much of the core code (like sorted) is actually written in C but many of the higher level modules are in Python - and you probably have it on your PC/Mac if you look for the Python modules folder... The good news is that unlike some opensource projects the code quality is pretty good and you can usually figure out how it works fairly easily, even the C stuff. (Having said that I only look at the source about once a year on average, only if things are getting really hairy... :-) HTH, Alan G. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] IDEs
Steven D'Aprano st...@pearwood.info wrote And we still wound up with over 50 reported bugs during Beta test... But that was much better than the 2000 bugs on an earlier project :-) But testing is hard. Maybe so, but nothing beats running your test suite and seeing everything pass! Yes, I should have added ... but debugging is even harder! :-) Alan G. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] If os.path.lexists() isn't working properly
Susana Iraiis Delgado Rodriguez susana.delgad...@utzmg.edu.mx wrote I'm writing a python script to validate if files with extension .prj exist, if they exist it should write 1 or 0 into an excel cell. I've working to do this properly, but I'm not getting the results I need. The script doesn't find all the files, is like the files don't exist but they exist, besides I think is just reading some of the files that are in C:\Python 26. I really need a hand on this. I haven't checked the code thoroughly but it looks like you should maybe put in a print statement to print the root to check it is going where you think it should. HTH, -- Alan Gauld 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] If os.path.lexists() isn't working properly
Hello Peter!
I added the line you suggested me and found out that I was just searching
for the filenames without pointing to a specific directory, so Python took
its directory (Python26) as default. After that I need to add a '\' to
separate the path from the filename because it was reading them as a single
string. But finally it worked nicely! here is the corrected script.
import os, time, socket, pylab, fnmatch
from xlwt import Workbook
from osgeo import ogr,gdal,osr
from dbf import *
gdal.AllRegister()
file_list = []
folders = None
for root, folders, files in os.walk( C:\\ ):
for filename in fnmatch.filter(files, '*.shp'):
file_list.append(os.path.join(root, filename))
wrkbk = Workbook()
wksht = wrkbk.add_sheet('shp')
wksht.row(0).write(0,'ruta')
wksht.row(0).write(1,'archivo')
wksht.row(0).write(2,'prj')
for row, filepath in enumerate(file_list, start=1):
wksht.row(row).write(0, filepath)
(ruta, filename) = os.path.split(filepath)
wksht.row(row).write(1, filename)
n = os.path.splitext(filename)
p = ruta+'\\'+n[0]+'.prj'
#ruta is the variable that saves the pathfile
print looking for, p
#I changed to os.path.exists()
if os.path.exists(p):
wksht.row(row).write(2, 1)
else:
wksht.row(row).write(2, 0)
wrkbk.save('shp3.xls')
#Mensajes para mostar en la consola
SEARCH_PATH = os.getcwd()
TARGET_FILE = os.path.realpath('shp3.xls')
print Buscando en, SEARCH_PATH, and writing to, TARGET_FILE
print Encontrando archivos...
print Escribiendo archivo de Excel...
print Listo.
Thank you so much fro your help!
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[Tutor] Random Number Question
Hello, I'm trying to find a way to use the random.randint function to generate a random number, but everytime I run the program it locks up IDLE. Here is what I have so far: import random def main(): x = input(Enter a number: ) y = input(Enter a different number: ) z = random.randint(x,y) print The random number between , x, and , y, is , z main() Can you tell me where I'm going wrong here? When I run the program it allows me to enter the numbers for x and y, then freezes. Thanks! Jeff ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Random Number Question
On 24/11/10 21:51, Jeff Goodwin wrote: Hello, I'm trying to find a way to use the random.randint function to generate a random number, but everytime I run the program it locks up IDLE. Here is what I have so far: import random def main(): x = input(Enter a number: ) y = input(Enter a different number: ) z = random.randint(x,y) print The random number between , x, and , y, is , z main() Can you tell me where I'm going wrong here? When I run the program it allows me to enter the numbers for x and y, then freezes. Thanks! Jeff ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Your print statement isn't indented. It should print the random number between and then throw an exception I think. You should either move the print statement into the function or have main return x, y, z and print the return values of it. HTH. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Random Number Question
Thanks Adam, that was a typo on my part, in the program the print is actually indented. Any other suggestions? Thanks again! Jeff On Wed, Nov 24, 2010 at 5:00 PM, Adam Bark adam.jt...@gmail.com wrote: On 24/11/10 21:51, Jeff Goodwin wrote: Hello, I'm trying to find a way to use the random.randint function to generate a random number, but everytime I run the program it locks up IDLE. Here is what I have so far: import random def main(): x = input(Enter a number: ) y = input(Enter a different number: ) z = random.randint(x,y) print The random number between , x, and , y, is , z main() Can you tell me where I'm going wrong here? When I run the program it allows me to enter the numbers for x and y, then freezes. Thanks! Jeff ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options:http://mail.python.org/mailman/listinfo/tutor Your print statement isn't indented. It should print the random number between and then throw an exception I think. You should either move the print statement into the function or have main return x, y, z and print the return values of it. HTH. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Random Number Question
Ok, I found the problem, I had saved the file as random.py looks like that was a no-no. Its working now that I changed the name. Thanks! Jeff On Wed, Nov 24, 2010 at 5:06 PM, Jeff Goodwin jeffbgood...@gmail.comwrote: Thanks Adam, that was a typo on my part, in the program the print is actually indented. Any other suggestions? Thanks again! Jeff On Wed, Nov 24, 2010 at 5:00 PM, Adam Bark adam.jt...@gmail.com wrote: On 24/11/10 21:51, Jeff Goodwin wrote: Hello, I'm trying to find a way to use the random.randint function to generate a random number, but everytime I run the program it locks up IDLE. Here is what I have so far: import random def main(): x = input(Enter a number: ) y = input(Enter a different number: ) z = random.randint(x,y) print The random number between , x, and , y, is , z main() Can you tell me where I'm going wrong here? When I run the program it allows me to enter the numbers for x and y, then freezes. Thanks! Jeff ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options:http://mail.python.org/mailman/listinfo/tutor Your print statement isn't indented. It should print the random number between and then throw an exception I think. You should either move the print statement into the function or have main return x, y, z and print the return values of it. HTH. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Random Number Question
On 24/11/10 22:10, Jeff Goodwin wrote: Ok, I found the problem, I had saved the file as random.py looks like that was a no-no. Its working now that I changed the name. Thanks! Jeff Ah yes always avoid giving your modules names that appear in the standard library. It goes wrong, sometimes in unexpected ways. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Python module structure directories
Hi, I am very new to Python, I worked on C/C++ before. I would like to know is it a good practice to put Python development code under ../src/UI/foo.py ../src/businesslogic/bar.py, etc. or should we eliminate src' directory since it is not pythonic, or it very C/C++ like. I was told that the above directory/file structure does not apply to Python, since Python's source code are objects. What do you say? Are there any standard for how Python source code to be structured? Thanks a lot and I am looking forward to hearing from you soon. Best regards, -- Judy ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python module structure directories
Judy Chen jgc...@yahoo.com wrote I am very new to Python, I worked on C/C++ before. I would like to know is it a good practice to put Python development code under ../src/UI/foo.py ../src/businesslogic/bar.py, etc. Thats fine, especially if its a big project. src means source code and python is a type of source just as C is. or should we eliminate src' directory since it is not pythonic, or it very C/C++ like. Who says its not pythonic? src is a perfectly common name to use on Unix type systems for all types of source code. I was told that the above directory/file structure does not apply to Python, since Python's source code are objects. The source code is not really an object but becaiuse you can import any python file as a module, and modules are objects (once they are loaded) you might get away with saying that. But really, python source files are no different to any other source files when it comes to organising your file system for a project. Are there any standard for how Python source code to be structured? Not that I'm aware of. There are some standards for how to create packages which might restrict things a little but oprovided you have your PYHONPATH set up tio find the modules all should be well. And you might want to create a build script that moves the modules from src to lib in the production file system. But on a project, especially one with multiple programming languages, having all source files in one place is a definite plus IMHO. Another thing to do would be take a look at some of the Python projects on Sourceforge - DIA for example. See how they structure their code. -- Alan Gauld 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] Random Number Question
Jeff Goodwin jeffbgood...@gmail.com wrote Ok, I found the problem, I had saved the file as random.py looks like that was a no-no. Its working now that I changed the name. Yes that's a bad idea. You probably figured out why, but just in case... import random It tries to import itself, which then tries to import itself, which then. infinite loop time... -- Alan Gauld 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] Random Number Question
Thanks Adam and Alan for responding, I'm very much a non-programmer, but my 14 year old son wants to learn, so I have to learn to teach him...slow process lol. Happy Thanksgiving! Jeff On Wed, Nov 24, 2010 at 8:27 PM, Alan Gauld alan.ga...@btinternet.comwrote: Jeff Goodwin jeffbgood...@gmail.com wrote Ok, I found the problem, I had saved the file as random.py looks like that was a no-no. Its working now that I changed the name. Yes that's a bad idea. You probably figured out why, but just in case... import random It tries to import itself, which then tries to import itself, which then. infinite loop time... -- Alan Gauld 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 maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] If os.path.lexists() isn't working properly
On 01/-10/-28163 02:59 PM, Susana Iraiis Delgado Rodriguez wrote: Hello Peter! I added the line you suggested me and found out that I was just searching for the filenames without pointing to a specific directory, so Python took its directory (Python26) as default. After that I need to add a '\' to separate the path from the filename because it was reading them as a single string. But finally it worked nicely! here is the corrected script. snip wksht.row(row).write(1, filename) n = os.path.splitext(filename) p = ruta+'\\'+n[0]+'.prj' Use os.path.join() to combine these nodes. If you use an explicit backslash you can trigger two problems: 1) Your code won't be portable to other platforms 2) You could have trouble if one of the components already has a path separator. DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Random Number Question
On Thu, 25 Nov 2010 00:58:23 + Adam Bark adam.jt...@gmail.com wrote: Ah yes always avoid giving your modules names that appear in the standard library. It goes wrong, sometimes in unexpected ways. I was wondering... apart from checking each name individually, is there any easy-peasy way to get a list of names used in the standard library (I am thinking to something like dir()? Mac. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
