Re: [Tutor] New to Programming
Dave Angel wrote: > > Kaushal Shriyan wrote: >> Hi, >> >> I am absolutely new to programming language. Dont have any programming >> experience. Can some one guide me please. is python a good start for >> novice. >> >> Thanks, >> >> Kaushal >> >> > Like nearly all questions, the answer is "it depends." > > Mainly, it depends on what your goal is. In my case, I made my living > with programming, for many years. And in the process, learned and used > about 35 languages, plus a few more for fun. I wish I had discovered > Python much earlier, though it couldn't have been my first, since it > wasn't around. But it'd have been much better than Fortran was, for > learning. > > So tell us about your goals. Abstract knowledge, console utilities, gui > development, games, web development, networking communication, ... > > Next, you might want to evaluate what you already know. There are a lot > of non-programming things that a programmer needs to understand. If you > already know many of them, that's a big head start. If you already know > how to administer a Linux system, you're already a programmer and didn't > know it. If you write complex formulas for Excel, you're a programmer. > If you already know modus ponens, and understand what a contrapositive > is, you've got a head start towards logic (neither is a programming > subject, just a start towards logical thinking). If you've worked on a > large document, and kept backups of incremental versions, so you could > rework the current version based on earlier ones, that's a plus. If you > know why a file's timestamp might change when you copy it from hard disk > to a USB drive and back again, you've got a head start. If you know why > it might have a different timestamp when you look at it six months from > now without changing it, you've got a head start. > > If you're using Windows and never used a command prompt, you have a ways > to go. If you don't know what a file really is, or how directories are > organized, you have a ways to go. And if you think a computer is > intelligent, you have a long way to go. > > Python is a powerful tool. But if you're totally new to programming, it > can also be daunting. And most people have no idea how easy some > programs are, nor how hard some other programs are, to build. > > In any case, some of the things recommending Python as a first language > are: >1) an interactive interpreter - you can experiment, trivially >2) very fast turnaround, from the time you make a change, till you > can see how it works. This can be true even for large programs >3) this mailing list > > DaveA > > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor > > Thanks for this thread. It really helps. Those links were very informative. :) - [url=http://crosspromotion.wizard4u.com/]joint ventures[/url] -- View this message in context: http://old.nabble.com/-Tutor--New-to-Programming-tp28863541p28878181.html Sent from the Python - tutor mailing list archive at Nabble.com. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] large file
Alan Gauld wrote:
>
>
> "Hs Hs" wrote
>
>> I have a very large file 15Gb.
>
>> Every two lines are part of one readgroup.
>> I want to add two variables to every line.
>
>> HWUSI-EAS1211_0001:1:1:977:20764#0 RG:Z:2301
>> HWUSI-EAS1211_0001:1:1:977:20764#0RG:Z:2302
>> ...
>> Since I cannot read the entire file, I wanted to cat the file
>
> What makes you think you cannot read the entire file?
>
>> something like this:
>>
>> cat myfile | python myscript.py > myfile.sam
>
> How does that help over Python reading the file line by line?
>
>> I do not know how to execute my logic after I read the line,
>> althought I tried:
>
>> while True:
>>second = raw_input()
>>x = second.split('\t')
>
> Why are you splitting theline? You only need to append
> data to the end of the line...
>
>> Could someone help me here either what I want to do.
>
> In pseudo code:
>
> open input and ouput files
> read the first 14 lines from input
> oddLine = True
> while True:
> read line from input
> if oddLine:
> append odd data
> else
>append evenData
> write line to output file
> oddLine = not oddLine
>
> You probably want a try/except in there to catch the end of file.
>
>
> This is not very different from the menu example in the file
> handling topic of my tutorial...
>
> HTH
>
> --
> Alan Gauld
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
>
>
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>
Thanks for this thread. This is very helful. I'm learning a lot from you
guys. :)
-
[url=http://crosspromotion.wizard4u.com/]joint ventures[/url]
--
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Re: [Tutor] Better construct?
Many thanks to all, repeat WHILE is exactly what I needed. I got BASIC stuck in my head. GOTO line# YUCK! ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Better construct?
"Advertising Department" wrote repeat WHILE is exactly what I needed. I got BASIC stuck in my head. GOTO line# YUCK! BASIC has a WHILE/WEND construct too :-) Even GW Basic supported that. Alan G. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Structuring a class
I'm trying to figure out how to deal with data which will look something
like:
Student:Bob Hurley
ID: 123456
Period:4
Grad_class: 2012
Credits:
Algebra C (20P)
Chapter 1
Date: September 14, 2010
Grade: 87
Credits:1.5
Notes: Probably cheated on final. Really watch on
next quiz/test.
Chapter 2
Date: October 31, 2010
.
. **and so on**
.
Consumer Math (24G)
Module 2
.
. **more information like above**
.
So, I just figured that I would have a couple of nested dictionaries.
bob = Student('123456','Bob Hurley')
bob.period = 4
bob.grad_class = 2010
bob['credits']['Algebra C (20P)']={'Chapter 1':{'Date':'September
12, 2010', 'Grade':'87', **and so on**}}
This works, for the most part, from the command line. So I decided to
set up a class and see if I could work it from that standpoint (I'm
doing this to scratch an itch, and try to learn). My preliminary class
looks like:
class Student:
def __init__(self, ident=' ', name=' ', period=' ', grad_class='
', subject=' ', notes=' ', credit=' '):
self.name = name
self.ident = ident
self.period = period
self.notes = notes
self.grad_class = grad_class
# self.credit = {{}}<--- BAD
self.credit = {}
I'm sure that someone will enlighten me as to where my poor coding
skills are especially weak. It's the last line there (self.credit...)
which I can't figure out. The credits may be in any of about 30
different subjects (teaching at a continuation high school makes for
interesting times).
If I don't set it to anything, ie, like it is, I get an error
Stud instance has no attribute '__getitem__'
If I try to leave it available for adding to somewhat dynamically, I get
a 'wtf' from python.
Sorry for the novel, I'm just wondering if someone would set me
straight. Should I even use a class? If so, how do I set up a class
item which let's me add dictionaries to it? Thanks.
-Lang
--
There are no stupid questions, just stupid people.
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Re: [Tutor] Structuring a class
On 6/14/2010 8:08 PM, Lang Hurst wrote:
I'm trying to figure out how to deal with data which will look
something like:
Student:Bob Hurley
ID: 123456
Period:4
Grad_class: 2012
Credits:
Algebra C (20P)
Chapter 1
Date: September 14, 2010
Grade: 87
Credits:1.5
Notes: Probably cheated on final. Really watch on
next quiz/test.
Chapter 2
Date: October 31, 2010
.
. **and so on**
.
Consumer Math (24G)
Module 2
.
. **more information like above**
.
Before deciding on data structures I suggest you give the big picture.
Where will data come from? What do you plan to do with it?
Often a case like this is better handled using a relational database.
Python happens to come with the sqlite3 module which makes database work
quite easy.
So, I just figured that I would have a couple of nested dictionaries.
bob = Student('123456','Bob Hurley')
bob.period = 4
bob.grad_class = 2010
bob['credits']['Algebra C (20P)']={'Chapter 1':{'Date':'September
12, 2010', 'Grade':'87', **and so on**}}
This works, for the most part, from the command line. So I decided to
set up a class and see if I could work it from that standpoint (I'm
doing this to scratch an itch, and try to learn). My preliminary
class looks like:
class Student:
def __init__(self, ident=' ', name=' ', period=' ',
grad_class=' ', subject=' ', notes=' ', credit=' '):
self.name = name
self.ident = ident
self.period = period
self.notes = notes
self.grad_class = grad_class
# self.credit = {{}} <--- BAD
self.credit = {}
I'm sure that someone will enlighten me as to where my poor coding
skills are especially weak. It's the last line there (self.credit...)
which I can't figure out. The credits may be in any of about 30
different subjects (teaching at a continuation high school makes for
interesting times).
You should define a class for Credit, which will hold the credit
attributes, just like you did for Student. Then assign instances of
Credit to entries in self.credit.
If I don't set it to anything, ie, like it is, I get an error
Stud instance has no attribute '__getitem__'
If I try to leave it available for adding to somewhat dynamically, I
get a 'wtf' from python.
Sorry I don't understand these. It is a good idea to post full
tracebacks and the code that raises the exception.
--
Bob Gailer
919-636-4239
Chapel Hill NC
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Re: [Tutor] Structuring a class
bob gailer wrote: Often a case like this is better handled using a relational database. Python happens to come with the sqlite3 module which makes database work quite easy. You should define a class for Credit, which will hold the credit attributes, just like you did for Student. Then assign instances of Credit to entries in self.credit. Last time I did anything with python, it was years ago on a web application and I ended up using gadfly as a database. I did not know that sqlite3 came as a module for python. That just made it much, much easier. I've done much more work with databases. Thank you. I figured that I was probably missing something obvious. -Lang -- There are no stupid questions, just stupid people. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] large file
> Thanks for this thread. This is very helful. I'm learning a lot from you > guys. :) > > - > [url=http://crosspromotion.wizard4u.com/]joint ventures[/url] > > -- > View this message in context: > http://old.nabble.com/-Tutor--large-file-tp28874185p28878191.html > Sent from the Python - tutor mailing list archive at Nabble.com. > > ___ > Tutor maillist - tu...@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor > I think this subscriber is just spamming. Two post with the same text. Eduardo ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
