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Exci
Apprentice
Joined: 12 Jul 2002
Posts: 265
Location: The Netherlands, Zoetermeer
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 Posted: Wed Jul 30, 2003 6:36 pm Post subject: Question about OOP in Python |
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I have coded some apps in java and I really like the way of java coding.
But I wanted to learn more 'languages' so I started learning Python some weeks ago, I must say that I like it, I started coding something for xchat to get to know the language a bit, I coded a '_OW SO ANNOYING_' mp3script with a mysql backend (for recording of mp3 played/skipped/finished topX bandtopX etc) I did that in 2 scripts, one for xchat and 1 for CLI (that fixes the database if needed).
But I never used classes, until I tried to make a IRC client to try socket programming a bit. but I want (just as I would do in java) to give every class i make its own file, and store that in the same(or sub)dir as the 'starter' is in. how does this work in python? can someone give me an example ?
ps, I looked in the python tutorial on python.org but I couldn't find anything about it  |
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compu-tom
Guru
Joined: 09 Jan 2003
Posts: 415
Location: Berlin, Germany
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| Posted: Wed Jul 30, 2003 7:43 pm Post subject: |
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Assumed you have in file MyClass.py:
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# declare the class "MyClass"
class MyClass:
# The constructor has 2 args which are stored in instance variables
def __init__(self, firstArg, secondArg):
self.firstArg = firstArg
self.secondArg = secondArg
def someMethod(self):
print "someMethod called " + self.firstArg
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Then a subclass of MyClass, MySubclass:
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# Import all symbols from the modules MyClass into the
# current namespace.
from MyClass import *
# Declare MySubclass as subclass of MyClass
class MySubclass(MyClass):
# The constructor has 3 args, 2 of them are passed to the super
#constructor and the third is stored in an instance variable of
# MySubclass
def __init__(self, firstArg, secondArg, thirdArg):
MyClass.__init__(self, firstArg, secondArg)
self.thirdArg = thirdArg
def doSomeThing(self, what):
self.someMethod()
return "Done something " + what
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And in MyOtherClass.py:
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# This is an alternative way for import: Don't copy the symbols to the
# current namespace. This requires to fully specify the module's name
# and the actual symbol from the module to access it (see below)
import MySubclass
class MyOtherClass:
def __init__(self):
self.someClass = MySubclass.MySubclass("abc", 123, "456")
def doAnyThing(self):
print self.someClass.doSomeThing("very important")
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This code comes without warranty and untested 
Hope this helps... |
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Exci
Apprentice
Joined: 12 Jul 2002
Posts: 265
Location: The Netherlands, Zoetermeer
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| Posted: Wed Jul 30, 2003 8:40 pm Post subject: |
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ah thank you for making such clear examples  , I only tried the 'import myClass' and forgot the 'MySubclass.' in front of it so that's why I failed earlier
I just read the 'whats new in 2.3' and learned about the -O switch
I tried it and it made a .pyc does the 'c' mean (pre)compiled? and I found alot of .pyo in /usr/lib/python dir, o stands for object?
what's the difference between o and c ?
can you give me a small example? |
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compu-tom
Guru
Joined: 09 Jan 2003
Posts: 415
Location: Berlin, Germany
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| Posted: Wed Jul 30, 2003 8:51 pm Post subject: |
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File *.py are the source files,
*.pyc are the byte code compiled files (similar to *.class in java),
*.pyo are byte code files with basic optimization, according to "man python": | Quote: | -O Turn on basic optimizations. This changes the filename exten-
sion for compiled (bytecode) files from .pyc to .pyo. Given
twice, causes docstrings to be discarded.
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I never used the optimization flag. So I can't tell you if it makes a difference regarding performance. |
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Exci
Apprentice
Joined: 12 Jul 2002
Posts: 265
Location: The Netherlands, Zoetermeer
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| Posted: Wed Jul 30, 2003 9:26 pm Post subject: |
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ah, well I can play/code on with allot more overview now
and I'll play around withthe -O flag a bit
ty again |
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thraxil
n00b
Joined: 04 Apr 2003
Posts: 46
Location: nyc
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| Posted: Thu Jul 31, 2003 3:08 pm Post subject: |
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| since it looks like you're already a programmer, Mark Pilgrim's "Dive Into Python" tutorial (http://diveintopython.org/) should be very useful for you. |
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Exci
Apprentice
Joined: 12 Jul 2002
Posts: 265
Location: The Netherlands, Zoetermeer
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| Posted: Thu Jul 31, 2003 3:34 pm Post subject: |
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| thx, added to my bookmarks |
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