function & class

[jupiter]

hi friends,

I have a program like

some variable definations

a function ( arg1, agr2):
do something with arg1 & arg2
return a list

if condition
do this function(arg1,a rg2)
else
if condition
do this function
else
do this


My problem is I want to use threading and I might need to pass values
between function and classes. I am not sure how this can be done. I
have read about classes and I know they are like function however does
not return anything where as function does. If I define class and then
function in this class how do I access this function ?????

I am not sure and confused about classes and functions as how to go
about them is there any simple way to understand difference between
them and when to use what and how to pass data/reference pointer
between them ?

@nil
Pythonist

[Bruno Desthuilliers]

Re: function & class

jupiter a écrit :

hi friends,
>
I have a program like
>
some variable definations
>
a function ( arg1, agr2):
do something with arg1 & arg2
return a list
>
if condition
do this function(arg1,a rg2)
else
if condition
do this function
else
do this
>
>
My problem is I want to use threading and I might need to pass values
between function and classes.

which classes ? I see no class statement in your above pseudo-code.

I am not sure how this can be done. I
have read about classes and I know they are like function

Hmm. While technically, yes, Python classes are "callable" just like
functions are, this is mostly an implementation detail (or at least you
can consider it as such for now). Now from a conceptual POV, functions
and classes are quite different beasts.

however does
not return anything where as function does.

Where did you get such "knowledge" , if I may ask ? Looks like you need a
better source of informations !-)

If I define class and then
function in this class how do I access this function ?????

Classes are used to define and create ('instanciate' in OO jargon)
objects. Usually, one first creates an object, then calls methods on
this object:

class Greeter(object) :
def __init__(self, name, saywhat=None):
self.name = name
if self.saywhat is None:
self.saywhat = "Hello %(who)s, greetings from %(name)s"
else:
self.saywhat = saywhat

def greet(self, who):
return self.saywhat % dict(name=self. name, who=who)


bruno = Greeter('Bruno' )
print bruno.greet('Ju piter')

I am not sure and confused about classes and functions as how to go
about them is there any simple way to understand difference between
them

Read a tutorial on OO ? Here's one:

http://pytut.infogami.com/node11-baseline.html

and when to use what and how to pass data/reference pointer
between them ?

In Python, everything you can name, pass to a function or return from a
function is an object.

@nil
Pythonist
>

[sjdevnull@yahoo.com]

Re: function & class

Bruno Desthuilliers wrote:

Classes are used to define and create ('instanciate' in OO jargon)

Good info from Bruno, just a quick note that it's spelled
"instantiat e" (I'm not usually big on spelling corrections but since
you were teaching a new word I thought it might be worthwile).

[Bjoern Schliessmann]

Re: function & class

jupiter wrote:

My problem is I want to use threading

You're right. Why do you think you want to use (multi-)threading?

and I might need to pass values between function and classes. I am
not sure how this can be done. I have read about classes and I
know they are like function however does not return anything where
as function does. If I define class and then function in this
class how do I access this function ?????

I think you could read a tutorial about OOP, for example one of
those:

http://www.google.de/search?q=python+oop+tutorial

Feel free to post here for further questions.

I am not sure and confused about classes and functions as how to
go about them is there any simple way to understand difference
between them and when to use what and how to pass data/reference
pointer between them ?

BTW, please use some punctuation. Reading your multiline sentences
isn't easy.

Regards,


Björn

--
BOFH excuse #393:

Interference from the Van Allen Belt.

[jupiter]

Re: function & class

c.execute("sele ct symbol,tvolume, date,time from "+self.dbas e+"
where symbol=
?",t)
ProgrammingErro r: SQLite objects created in a thread can only be used
in that sa
me thread.The object was created in thread id 976 and this is thread
id 944

I am getting this error when I am using sql command within
class.function accessing from another class

how can I create seperate instance for sqlite objects ???????


@nil

[Bjoern Schliessmann]

Re: function & class

jupiter wrote:

I am getting this error when I am using sql command within
class.function accessing from another class
>
how can I create seperate instance for sqlite objects ???????

Trying to help you gets boring. I suggest reading the material
that's being offered.

Regards,


Björn

--
BOFH excuse #241:

_Rosin_ core solder? But...