Re: [Tutor] Tutor Digest, Vol 67, Issue 22
"Corey Richardson" wrote then you can program anything since sequences, loops and branches are all that are necessary to program anything! Ummm, whats a branch? Haha, I know loops, but not branches. Branches are if/else statements and case statements and jump or goto statements. In Python they are restricted to if/elif/else Sometimes known as conditionals. See the branching topic in my tutor for more detail. -- 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] Help deciding between python and ruby
"Luke Paireepinart" wrote I agree, but I can see how some people don't like it. It's similar to the Java vs. C++ debate I guess, Java is forced OO and C++ is optional. While this is a genuine complaint for Java I have to be fair and say that Ruby does a good job of hiding its OOP purity when you don't need it. Any function defined outside of a class automatically gets created as a static method of a "secret" hidden toplevel class that is never explicitly instantiated. So for the programmer you can 99% of the time forget that Ruby always requires OOP and use it just as you would non OOP Python. And of course so many of Python's types are now objects that it's virtually impossible to write a truly non OOP program in Python! So that point is rather moot for the Python/Ruby debate. - IMHO of course :-) -- 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] Tutor Digest, Vol 67, Issue 22
>
>
>> Ummm, whats a branch? Haha, I know loops, but not branches.
>
A branch changes the program flow based on a condition.
Example:
x = int(raw_input("Please enter a number!"))
if x > 10:
print "Your number was greater than 10!"
else:
print "Your number was less than or equal to 10!"
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Re: [Tutor] Tutor Digest, Vol 67, Issue 22
"Corey Richardson" wrote So far, I can use tuples/lists/dictionary's, and define some functions, and a bit of other things. Would it be hard for me to make a simple text rpg game? Or is there something else I should know before I try that. No idea about rpg because I've never played one far less written one. But you certainly have enough to write a simple game like mastermind, oxo or hangman... Assuming you also mean that you know about loops and branches then you can program anything since sequences, loops and branches are all that are necessary to program anything! So go for it, and if you get stuick as here. Ummm, whats a branch? Haha, I know loops, but not branches. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to read and transmit/send only section of the image (sub-image)
thanks a lot . cheers Johnson On Sun, Sep 6, 2009 at 4:23 PM, Kent Johnson wrote: > On Sat, Sep 5, 2009 at 10:52 AM, Jojo Mwebaze > wrote: > > oooh that will be helpful, kindly point me to how i can begin with > getting > > a sub-image that has the same width as the > > original. That will be my starting point. > > I don't know the details of FITS format, but I imagine it would be > something like this: > - read enough of the FITS header to figure out where the image data is > in the file > - seek to the start of the sub-image and read the image data > - construct a new header for the sub-image > - write the new header and data to a new file > > This will require some understanding of FITS format, or a library that > supports the operations you need. You might find code in PyFITS that > will help. > > Kent > ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Help deciding between python and ruby
On Sun, Sep 6, 2009 at 10:21 AM, kevin parks wrote: > Well, the only thing more annoying than off topic discussion is "meta" > discussion on lists and folks passing judgement on other people's posts (ie. > you should have x, your should not have Y... I shouldn't have this second > doughnut, but you know what, i am gonna eat that *and* have a second cup of > coffee). So i'll resist the temptation to reply to Luke in detail, who i did > not realize was a moderator here. > For the record, I'm not a moderator. I'm sorry if it seemed like I was flaming you, I just don't think this discussion is a bad thing so far. Most of this has already been touched on in this thread ... But I would add > that that very past point is a HUGE reason why i use python. For little > pea-shooter scripts I don't want to have to know and apply advanced OOP > concepts. Yet if you do know them and your project requires it... it is > there. [snip] I like to dig right in and Python is good for that for sure. > > I agree, but I can see how some people don't like it. It's similar to the Java vs. C++ debate I guess, Java is forced OO and C++ is optional. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A basic question
"sharon" wrote I have been trying how to get a any python program to run by clicking on the icon. I keep reading on the internet make it executable: chmod a+x try_python.py You do this in a console window, at a bash prompt. You also need to add the "shebang" line at the top of the file. That's a standard format comment line that Unix knows to look at to determine which interpreter to use to execute the script. It's a Unix thing, not Python, which is why the tutorials don't say much about it, they assume you know Unix if you are using it. everytime. If I then sent this try_python.py to someone else with Ubuntu would it run on their system? Yes provided they use chmod on it too. You can find more about the chmod and shebang stuff in the Style topic off my tutorial inside the Note for Unix Users near the bottom. -- 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] Simple Game
"Corey Richardson" wrote So far, I can use tuples/lists/dictionary's, and define some functions, and a bit of other things. Would it be hard for me to make a simple text rpg game? Or is there something else I should know before I try that. No idea about rpg because I've never played one far less written one. But you certainly have enough to write a simple game like mastermind, oxo or hangman... Assuming you also mean that you know about loops and branches then you can program anything since sequences, loops and branches are all that are necessary to program anything! So go for it, and if you get stuick as here. 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] A basic question
On Thu, Aug 6, 2009 at 4:20 PM, sharon wrote: > I have been trying how to get a any python program to run by clicking on > the icon. I keep reading on the internet make it executable: > > chmod a+x try_python.py > Did you write: #!/usr/bin/env python at the first line of the file too? > Where do I actually put the above expression so that it will work > everytime. If I then sent this try_python.py to someone else with Ubuntu > would it run on their system? Sorry if this is too basic but it is an > assumption that seems to be made and I really am a complete beginner. > Don't worry about it. :-) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Pack/Unpack hacking
On Sun, Sep 6, 2009 at 2:20 PM, Tino Dai wrote: > Hi All, > > Hope the people in the US are having a nice Labor Day! I am looking for > the source code > for the pack/unpack functions found in the struct package. As of this email, > I have tried a > strings on the struct.pyc file. The inspection of the pyc file was hoping > that I could find a > stub to the source. I also looked directly at struct.py, with no success. > Finally, I also tried > downloading the source and grepping through the files, which didn't prove > all that useful. > Does anybody have any ideas on how I can find the source without having to > go through > the entire source tree file by file? In general, xxx.pyc is the compiled Python bytecode for xxx.py, so struct.py is the source for struct.pyc. Looking at struct.py, it's entire contents is from _struct import * from _struct import _clearcache This is a pretty common idiom in the std lib for modules that are implemented partially or completely as C extensions - there is a Python wrapper, called xxx.py, which imports functions from a C extension called _xxx. Often there are some functions in the Python module; in this case, the implementation is entirely in _struct and struct.py is just a shell. The source for C extension modules in the std lib is in the Modules folder. Look for _struct.c. BTW another common convention is for modules that are implemented entirely in C; they will have source in Modules/xxxmodule.c, for example datetimemodule.c. Kent ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Pack/Unpack hacking
Hope the people in the US are having a nice Labor Day! I am looking for the source code for the pack/unpack functions found in the struct package. As of this email, I have tried a strings on the struct.pyc file. The inspection of the pyc file was hoping that I could find a stub to the source. I also looked directly at struct.py, with no success. Finally, I also tried downloading the source and grepping through the files, which didn't prove all that useful. Does anybody have any ideas on how I can find the source without having to go through the entire source tree file by file? http://svn.python.org/view/python/trunk/Modules/_struct.c?view=markup TJG ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] A basic question
I have been trying how to get a any python program to run by clicking on the icon. I keep reading on the internet make it executable: chmod a+x try_python.py Where do I actually put the above expression so that it will work everytime. If I then sent this try_python.py to someone else with Ubuntu would it run on their system? Sorry if this is too basic but it is an assumption that seems to be made and I really am a complete beginner. Thanks for any help Sharon ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Pack/Unpack hacking
On Sun, Sep 6, 2009 at 3:20 PM, Tino Dai wrote: > Hi All, > > Hope the people in the US are having a nice Labor Day! I am looking for > the source code > for the pack/unpack functions found in the struct package. As of this > email, I have tried a > strings on the struct.pyc file. The inspection of the pyc file was hoping > that I could find a > stub to the source. I also looked directly at struct.py, with no success. > Finally, I also tried > downloading the source and grepping through the files, which didn't prove > all that useful. > Does anybody have any ideas on how I can find the source without having to > go through > the entire source tree file by file? > IIUC, there's a program called Cscope that might help. :-) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Pack/Unpack hacking
Hi All, Hope the people in the US are having a nice Labor Day! I am looking for the source code for the pack/unpack functions found in the struct package. As of this email, I have tried a strings on the struct.pyc file. The inspection of the pyc file was hoping that I could find a stub to the source. I also looked directly at struct.py, with no success. Finally, I also tried downloading the source and grepping through the files, which didn't prove all that useful. Does anybody have any ideas on how I can find the source without having to go through the entire source tree file by file? Thanks in advance, Tino ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Simple Game
Hi Corey, If this is going to be a command line program, two things that immediately come to mind for me are: validating user input and persistence. If you put something like "(1) to attack, (2) to run" what if the user types "yes", or "Y", or "9"? You'll want to make sure your program doesn't crash on wrong user input. And as far as "saving" the game, will the user be able to pick up where they left off(tracking user stats, progress in the game, posessions, etc)? If so, you'll need some kind of persistence, Pickle-ing or a SQLite database, etc. On Sun, Sep 6, 2009 at 10:09 AM, Corey Richardson wrote: > So far, I can use tuples/lists/dictionary's, and define some functions, and > a bit of other things. > Would it be hard for me to make a simple text rpg game? Or is there > something else I should know before I try that. > ___ > 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] Simple Game
So far, I can use tuples/lists/dictionary's, and define some functions, and a bit of other things. Would it be hard for me to make a simple text rpg game? Or is there something else I should know before I try that. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Problem with complex strings as key for a shelve-Dictionary
On Sun, Sep 6, 2009 at 6:20 AM, markus kossner wrote:
> Dear all,
> I have a Problem with complex strings as keys in a shelve Object:
>
> #!/usr/bin/python
> import shelve
> test=shelve.open('testshelve')
> test={
> 'CCN1c2c2/C(=C2/S/C(=N\c3ccc(Cl)cc3)N(C)C2=O)C1=O':int(0),
> 'CN1/C(=N\c2ccc(Cl)cc2)S/C(=C2\C(=O)Nc3c32)C1=O':int(20),
> 'c1cc2c(cc1)N(CCCl)C(=O)/C2=C1\S/C(=N/c2ccc(F)cc2)NC1=O':float(1),
> 'Cc1(/N=C2/NC(=O)/C(=C3\c4c(4)N(C)C3=O)S2)c1C':0.5,
> }
You just re-assigned test to be a plain dict, the result of
shelve.open() is lost. You want
test=shelve.open('testshelve')
test['CCN1c2c2/C(=C2/S/C(=N\c3ccc(Cl)cc3)N(C)C2=O)C1=O'] = int(0)
etc.
> This works fine as long as I keep the shelve opened.
> However, when I then want to open the shelve with another python script
> I get key errors, as the different keys are not found:
Because you are not actually using the shelve, you are throwing away
immediately.
Kent
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Re: [Tutor] how to read and transmit/send only section of the image (sub-image)
On Sat, Sep 5, 2009 at 10:52 AM, Jojo Mwebaze wrote: > oooh that will be helpful, kindly point me to how i can begin with getting > a sub-image that has the same width as the > original. That will be my starting point. I don't know the details of FITS format, but I imagine it would be something like this: - read enough of the FITS header to figure out where the image data is in the file - seek to the start of the sub-image and read the image data - construct a new header for the sub-image - write the new header and data to a new file This will require some understanding of FITS format, or a library that supports the operations you need. You might find code in PyFITS that will help. Kent ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] mapping/filtering a sequence
I actually find the map biz easier to get my head around than the list
comp. I guess this makes it another good reason for me to be happy
that map is apparently staying in after nearly being depreciated. I
generally prefer list comp in every instance, but the idea of an if
else construct within the conditional of a list comp really hurts my
brain, but it is nice to see that, had map(), filter() and reduce()
all gotten the boot, there is a way to do it with a list comp, opaque
as it is.
Thanks to all who responded this.
-kp--
On Sep 6, 2009, at 5:29 AM, Mark Tolonen wrote:
"Douglas Philips" wrote in message news:9ee00578-6af7-4c6c-9968-af5f25a00...@mac.com
...
On 2009 Sep 5, at 12:22 PM, Mark Tolonen wrote:
As a list comp:
L=range(30,41)
[{38:34,40:39}.get(n,n) for n in L]
[30, 31, 32, 33, 34, 35, 36, 37, 34, 39, 39]
True, that is terse, but IMHO has maintainability issues. The
mapping data structure and the method of transformation (.get())
are tangled in with the transformation itself.
Again, IMHO, unless this is a very short script, the maintenance
should outweigh raw terseness.
This *was* a very short script. My point was using a list comp. If
you want to nitpick, don't use lower-case L for variables either :^)
my_map = { 38: 34, 40: 39 }
def filter_item(item):
return my_map.get(item, item)
L = [filteritem(n) for n in L]
Happy?
-Mark
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Re: [Tutor] Help deciding between python and ruby
Well, the only thing more annoying than off topic discussion is "meta" discussion on lists and folks passing judgement on other people's posts (ie. you should have x, your should not have Y... I shouldn't have this second doughnut, but you know what, i am gonna eat that *and* have a second cup of coffee). So i'll resist the temptation to reply to Luke in detail, who i did not realize was a moderator here. In any case, I happen to have right in front of me, a brandy new spendy (in Korea anyway) copy of the Lutz book Learning Python 3rd Edition O'Reilly and if you look at "Part I Getting Started," the book begins with a very compelling section called "Why People Use Python" and it outlines: Software quality Development productivity Program Portability Support libraries Component integration Enjoyment and the end of this chapter, pp. 18-19 has a section called: "How does python stack up to language x" which gives a bunch of comparisons to Ruby and others. Here he says: [Python] is more mature and has a more readable syntax than Ruby. Unlike Ruby and Java, OOP is an option in Python — Python does not impose OOP on users or projects which might not apply. Most of this has already been touched on in this thread ... But I would add that that very past point is a HUGE reason why i use python. For little pea-shooter scripts I don't want to have to know and apply advanced OOP concepts. Yet if you do know them and your project requires it... it is there. One of the criticism of Python by Ruby users is that it isn't as "purely OO" as Ruby is. It is up to you whether that is a bug or a feature. But you can go quite far in Python without being an OOP guru but i am not sure that is entirely true of Ruby. Check with Ruby users. Personally i don't want to have to know how to do Schenkerian analysis and set theory just to have my first piano lesson and play Mary had a little Lamb, and i don't want to learn Norwegian just to hear a Norwegian folk tale. I like to dig right in and Python is good for that for sure. -k On Sep 6, 2009, at 5:45 AM, Luke Paireepinart wrote: ruby on the other is more 'implicit,' used more in web-apps (via ROR), emphasizes code-readability/beauty, and is more flexible (i.e. has more than one way of doing something). You mean people actually like ruby's syntax? I think Python's the prettiest language I've worked with syntactically. I wouldn't call having multiple ways to do something "flexible". I agree more with Python's philosophy, there should be one (and preferably only one) obvious way to do something. @kevin parks: > I am (and i am sure i will be over-ruled and shouted down for this), not entirely sure the tutor list > is the appropriate place for this query. Places like comp.lang.python better serve this purpose. This is a good point, you probably should have stopped there. Yes, this is probably not the best place for this discussion. I would like to see how it pans out, though, now that we're already 15 posts in. It's not very difficult to ignore a thread in your favorite e-mail client, perhaps you could just do that? If these debates become commonplace I will probably help you yell at everyone to stop flooding the list, but the amount of such questions has always been quite low and never bothersome, and I've been on Tutor since 2005. ___ 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] Problem with complex strings as key for a shelve-Dictionary
Dear all,
I have a Problem with complex strings as keys in a shelve Object:
#!/usr/bin/python
import shelve
test=shelve.open('testshelve')
test={
'CCN1c2c2/C(=C2/S/C(=N\c3ccc(Cl)cc3)N(C)C2=O)C1=O':int(0),
'CN1/C(=N\c2ccc(Cl)cc2)S/C(=C2\C(=O)Nc3c32)C1=O':int(20),
'c1cc2c(cc1)N(CCCl)C(=O)/C2=C1\S/C(=N/c2ccc(F)cc2)NC1=O':float(1),
'Cc1(/N=C2/NC(=O)/C(=C3\c4c(4)N(C)C3=O)S2)c1C':0.5,
}
print test['CCN1c2c2/C(=C2/S/C(=N\c3ccc(Cl)cc3)N(C)C2=O)C1=O']
==> script works without problems
This works fine as long as I keep the shelve opened.
However, when I then want to open the shelve with another python script
I get key errors, as the different keys are not found:
#!/usr/bin/python
import shelve
test=shelve.open('testshelve')
print test['CCN1c2c2/C(=C2/S/C(=N\c3ccc(Cl)cc3)N(C)C2=O)C1=O']
==> leads to key error
I tried raw strings and so on, but did not manage.
Any Ideas?
Cheers Markus
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