Re: [Tutor] New to programming and Python
I'm sure I speak for us all when I ask what sort of things are giving you problems? Maybe that would help us point you in the right direction. Good Luck!On 10/25/06, Jorge Azedo [EMAIL PROTECTED] wrote: Hi guys ( and gals )I'm totally new to the whole programming scene (I decided to enter itfor many reasons, one of which is the fact that I *want* to know how toprogram my computer) and I decided to start out with Python. I'm reading lots of tutorials on it, trying to understand how to work with it, butfor some reason or another, it all seems a great mess to me. Am I doingsomething wrong? Also, can anyone give me any pointers on how to start working with Python?Thanks in advance for any help you can give me- Jorge___Tutor maillist-Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Self, Scopes and my unbelievable muddleheadedness.
doug shawhan [EMAIL PROTECTED] wrote
I'm having a rather difficult time understanding the proper use of
self.
Doug, I think you may be having a more fundamental problem.
Looking at your code at the most superficial level it seems
you may not understand objects.
Classes are used to generate objects. Objects represent things.
By logical deduction objects correspond to nouns in language.
Objects do things when they receive messages (Possibly
from other objects). Messages cause methods to be invoked,
methods therefore correspond to verbs in language.
Looking at your code we find:
class Create: # a verb
def freshDB(self, DBPATH, Fields): # a noun
def comparisonTable(self, DBPATH, Fields, columns, mode): #a noun
In other words you have the concept inside out.
you are trying to create Create objects and call Table and Database
methods. It doesn't make sense.
Normally we would expect to see DB and Table objects to which
you send create messages.
Now if you think of the objects as verbs then self is a confusing
concept.
But if you think of the objects as nouns then self is simply a
reference
to the object instance in question, a particular database or table.
I'd recommend going back and rethinking the design of your
objects before going much further.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld
I have two functions (yes, they are ugly, I was getting ready to
split them
in to smaller bits when this particular hole in my skull opened up)
in a
module. They use the same list of dictionaries to create some tables
in a
gadfly database.
I know I could fix this in any number of ways (including, but not
limited
to, acting on the same input list twice, or acting on it in such a
fashion
in the first place), but I am trying to actually understand self.
Here's the horrid, horrid mess:
class Create:
def freshDB(self, DBPATH, Fields):
self.Fields = Fields
for field in self.Fields.keys():
columns = self.Fields[field]
columns = columns.split(',')
query = ''
for each in columns:
query = %s, %s varchar%(query,each)
query = query[1:]
query = Create Table %s (%s)%(field,query)
self.Fields[field] = query
connection = gadfly.gadfly()
connection.startup(InventoryDB, DBPATH)
cursor = connection.cursor()
for field in self.Fields.keys():
cursor.execute(self.Fields[field])
connection.commit()
for field in self.Fields.keys():
cursor.execute(Select * from %s%field)
print cursor.pp()
connection.close()
def comparisonTable(self, DBPATH, Fields, columns, mode):
query =
if mode == 'new':
connection = gadfly.gadfly(InventoryDB,DBPATH)
cursor = connection.cursor()
try:
cursor.execute(drop table comparison)
except:
print No old table found.
columns = Fields[Common].split(',')
for each in columns:
query = %s, %s varchar%(query,each)
query = query[1:]
query = Create Table comparison (%s)%query
cursor.execute(query)
connection.commit()
cursor.execute(select * from comparison)
print cursor.pp()
Now when I run freshDB from the other script:
Fields = {Common:Inventory_Number, Stock_Number, Location, Year,
Make,
Model, Part_Type, Mileage, Description, Interchange_Data, Condition,
Price,
EvilBay:EvilBay_Title, EvilBay_Description,
HappyBase:HappyBase_Description, HappyBase_Long_Description}
d = DBMod
d.Create().freshDB(DBPATH, Fields)
d.Create().comparisonTable(DBPATH, Fields, columns, new)
the resulting query is:
Create Table comparison ( Inventory_Number varchar, Stock_Number
varchar,
Location varchar, Year varchar, Make varchar, Model varchar,
Part_Type
varchar, Mileage varchar, Description varchar, Interchange_Data
varchar,
Condition varchar, Price varchar)
The query from comparisonTable gives me:
Create Table comparison ( Create Table Common ( Inventory_Number
varchar
varchar, Stock_Number varchar varchar, Location varchar varchar,
Year
varchar varchar, Make varchar varchar, Model varchar varchar,
Part_Type varchar varchar, Mileage varchar varchar, Description
varchar
varchar, Interchange_Data varchar varchar, Condition varchar
varchar,
Price varchar) varchar)
If I restate the Fields input list before running comparisonTable,
my
results are as expected (i.e. exactly like the first query, exept
the table
is named comparison).
I thought that when self was invoked for a function then that data
was
acted on only for the scope of that function, yet the data is
changed in the
original. Why?
I'm sure this is so obvious that a
Re: [Tutor] New to programming and Python
Jorge Azedo escreveu: Hi guys ( and gals ) I'm totally new to the whole programming scene (I decided to enter it for many reasons, one of which is the fact that I *want* to know how to program my computer) and I decided to start out with Python. I'm reading lots of tutorials on it, trying to understand how to work with it, but for some reason or another, it all seems a great mess to me. Am I doing something wrong? Also, can anyone give me any pointers on how to start working with Python? Thanks in advance for any help you can give me - Jorge ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor Well, I´m also kind of new to the scene, so I still don´t know much. But you can try this book that I´ve been reading: Dive Into Python: http://www.diveintopython.org/ (you can download the PDF from there, which I belive has already a group of exemples to see when using the book). Also I´ve been reading the Python Wikibook that you can download from here: http://en.wikibooks.org/wiki/Python (it still has a few parts missing but it can give you a few pointers). (The part below problaby won´t make sense except if you are portuguese) I don´t know what type of Netcabo you have, if you want I can upload the pdf to a national host to count national traffic :) ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] New to programming and Python
Jorge Azedo wrote: Hi guys ( and gals ) I'm totally new to the whole programming scene (I decided to enter it for many reasons, one of which is the fact that I *want* to know how to program my computer) and I decided to start out with Python. I'm reading lots of tutorials on it, trying to understand how to work with it, but for some reason or another, it all seems a great mess to me. Am I doing something wrong? Also, can anyone give me any pointers on how to start working with Python? You don't say which tutorials you are reading; make sure it is a beginners tutorial. There are several listed here: http://wiki.python.org/moin/BeginnersGuide/NonProgrammers Spend as much time trying things out as you do reading. Read a little, then start up the Python interpreter and type in the examples from the tutorial. Change them a little bit. Experiment. Don't go on in the reading until you are comfortable using what you have learned so far. You have to write, you can't learn to program just by reading. Ask questions here if you get stuck. Show us what you tried, what happened, and what you expected to happen. Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] New to programming and Python (Jorge Azedo)
Parece que ja temos elementos para estabelecer uma comunidade portuguesa de Python ;-) Jorge, Sugiro os tutoriais do site www.devshed.com. são simples e explicam bem o significado do codigo! Tb sou novo na programação, tenho ai 6 meses de Python. A Caixa Magica promove cursos de Python em Lisboa, este ano houve ja 2 de 3 dias, penso que em Fevereiro e Junho. Força, isto no inicio parece confuso, mas breve faz-se luz! Paulino Citando [EMAIL PROTECTED]: 2. New to programming and Python (Jorge Azedo) 7. Re: New to programming and Python (rolando) Date: Thu, 26 Oct 2006 09:44:41 +0100 From: rolando [EMAIL PROTECTED] Subject: Re: [Tutor] New to programming and Python To: tutor@python.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed Jorge Azedo escreveu: Hi guys ( and gals ) I'm totally new to the whole programming scene (I decided to enter it for many reasons, one of which is the fact that I *want* to know how to program my computer) and I decided to start out with Python. I'm reading lots of tutorials on it, trying to understand how to work with it, but for some reason or another, it all seems a great mess to me. Am I doing something wrong? Also, can anyone give me any pointers on how to start working with Python? Thanks in advance for any help you can give me - Jorge ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor Well, I?m also kind of new to the scene, so I still don?t know much. But you can try this book that I?ve been reading: Dive Into Python: http://www.diveintopython.org/ (you can download the PDF from there, which I belive has already a group of exemples to see when using the book). Also I?ve been reading the Python Wikibook that you can download from here: http://en.wikibooks.org/wiki/Python (it still has a few parts missing but it can give you a few pointers). (The part below problaby won?t make sense except if you are portuguese) I don?t know what type of Netcabo you have, if you want I can upload the pdf to a national host to count national traffic :) -- ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor End of Tutor Digest, Vol 32, Issue 110 ** ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] cgi form field and popup window
I would like to have a popup window to show the possible options to a form field (supplier ID) and that by clicking on the desired item, the field is automatically filled. The options are a database field values. I wonder if this is possible to do with python (point me some resources please), or have I to deal with javascript ? Many thanks, Paulino ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] New to programming and Python (Jorge Azedo)
I tought that we could only speak English in here :D Also I'm newer to python, about a mounth and a half since I started studing it. [EMAIL PROTECTED] escreveu: Parece que ja temos elementos para estabelecer uma comunidade portuguesa de Python ;-) Jorge, Sugiro os tutoriais do site www.devshed.com. são simples e explicam bem o significado do codigo! Tb sou novo na programação, tenho ai 6 meses de Python. A Caixa Magica promove cursos de Python em Lisboa, este ano houve ja 2 de 3 dias, penso que em Fevereiro e Junho. Força, isto no inicio parece confuso, mas breve faz-se luz! Paulino Citando [EMAIL PROTECTED]: 2. New to programming and Python (Jorge Azedo) 7. Re: New to programming and Python (rolando) Date: Thu, 26 Oct 2006 09:44:41 +0100 From: rolando [EMAIL PROTECTED] Subject: Re: [Tutor] New to programming and Python To: tutor@python.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed Jorge Azedo escreveu: Hi guys ( and gals ) I'm totally new to the whole programming scene (I decided to enter it for many reasons, one of which is the fact that I *want* to know how to program my computer) and I decided to start out with Python. I'm reading lots of tutorials on it, trying to understand how to work with it, but for some reason or another, it all seems a great mess to me. Am I doing something wrong? Also, can anyone give me any pointers on how to start working with Python? Thanks in advance for any help you can give me - Jorge ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor Well, I?m also kind of new to the scene, so I still don?t know much. But you can try this book that I?ve been reading: Dive Into Python: http://www.diveintopython.org/ (you can download the PDF from there, which I belive has already a group of exemples to see when using the book). Also I?ve been reading the Python Wikibook that you can download from here: http://en.wikibooks.org/wiki/Python (it still has a few parts missing but it can give you a few pointers). (The part below problaby won?t make sense except if you are portuguese) I don?t know what type of Netcabo you have, if you want I can upload the pdf to a national host to count national traffic :) -- ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor End of Tutor Digest, Vol 32, Issue 110 ** ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] New to programming and Python (Jorge Azedo)
rolando wrote: I tought that we could only speak English in here :D English is preferred and increases your chances of getting an answer :-) Kent Also I'm newer to python, about a mounth and a half since I started studing it. [EMAIL PROTECTED] escreveu: Parece que ja temos elementos para estabelecer uma comunidade portuguesa de Python ;-) Jorge, Sugiro os tutoriais do site www.devshed.com. são simples e explicam bem o significado do codigo! Tb sou novo na programação, tenho ai 6 meses de Python. A Caixa Magica promove cursos de Python em Lisboa, este ano houve ja 2 de 3 dias, penso que em Fevereiro e Junho. Força, isto no inicio parece confuso, mas breve faz-se luz! Paulino Citando [EMAIL PROTECTED]: 2. New to programming and Python (Jorge Azedo) 7. Re: New to programming and Python (rolando) Date: Thu, 26 Oct 2006 09:44:41 +0100 From: rolando [EMAIL PROTECTED] Subject: Re: [Tutor] New to programming and Python To: tutor@python.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed Jorge Azedo escreveu: Hi guys ( and gals ) I'm totally new to the whole programming scene (I decided to enter it for many reasons, one of which is the fact that I *want* to know how to program my computer) and I decided to start out with Python. I'm reading lots of tutorials on it, trying to understand how to work with it, but for some reason or another, it all seems a great mess to me. Am I doing something wrong? Also, can anyone give me any pointers on how to start working with Python? Thanks in advance for any help you can give me - Jorge ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor Well, I?m also kind of new to the scene, so I still don?t know much. But you can try this book that I?ve been reading: Dive Into Python: http://www.diveintopython.org/ (you can download the PDF from there, which I belive has already a group of exemples to see when using the book). Also I?ve been reading the Python Wikibook that you can download from here: http://en.wikibooks.org/wiki/Python (it still has a few parts missing but it can give you a few pointers). (The part below problaby won?t make sense except if you are portuguese) I don?t know what type of Netcabo you have, if you want I can upload the pdf to a national host to count national traffic :) -- ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor End of Tutor Digest, Vol 32, Issue 110 ** ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] cgi form field and popup window
[EMAIL PROTECTED] wrote: I would like to have a popup window to show the possible options to a form field (supplier ID) and that by clicking on the desired item, the field is automatically filled. The options are a database field values. I wonder if this is possible to do with python (point me some resources please), or have I to deal with javascript ? The browser-side programming has to be in javascript. The server-side program that sends the javascript and the list of options to the browser can be in Python. You might want to look at the TurboGears widget set which provides many browser-side widgets that are configured from Python. Widgets are part of TG 1.0. Unfortunately the docs seem to be a bit thin and sorting it all out is probably not a beginner project. http://www.turbogears.org/ http://tgwidgets.toscat.net/ Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Python and config files?
Hi, friends! Is there exist a module for working with config file? Simple enough, just read/write config file (like for most unix app), determine where row is contain config words with it's parameters (like 'config_word=parameter') or it's a comments (#)? -- Basil Shubin Freelance Software Developer ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Help me.. problem in building calculator application
Asrarahmed Kadri wrote:
Hi folks,
I am trying to build a rudimentary calculator application using Tkinter...
I have used one Entry widget for displaying the input and output data.
All this is put in a class.
The porblem is when I click teh '+' button, teh callback function is
called but it gives me an error message: AttributeError: 'str' object
has no attribute 'get'
I have defined a variable, self.str1 = StringVar() to bind it with the
entry widget and I am calling the function when + is clciked. The
function is as follows:
self.buttonPlu = Button(self.container3,text='+',command = lambda:
self.oprClick('+',*self.str1.get()))*
Can't we use the get() method to access the contents of the entry
widget. Is there any other way to access the contents of the entry
widget???
The error message is saying that the object you are calling get() on is
a string, not a StringVar. Please post complete code and the complete
error message including traceback.
Kent
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python and config files?
Basil Shubin wrote: Hi, friends! Is there exist a module for working with config file? Simple enough, just read/write config file (like for most unix app), determine where row is contain config words with it's parameters (like 'config_word=parameter') or it's a comments (#)? Take a look at the ConfigParser module: http://docs.python.org/lib/module-ConfigParser.html Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Code with traceback...Re: Help me.. problem in building calculator application
Traceback is as under:
Traceback (most recent call last): File C:\python\lib\lib-tk\Tkinter.py, line 1345, in __call__ return self.func(*args) File calculator_version2.py, line 105, in lambda
self.buttonPlu = Button(self.container3,text='+',command = lambda: self.oprClick('+',self.str1.get()))AttributeError: 'str' object has no attribute 'get'
from Tkinter import *import string
class Mycalc:
def buttonClick(self,str2,str3): if str2 == .: if self.dotFlag: pass else: self.dotFlag = True
self.operand = str3 + str2 else: self.operand = str3 + str2
def oprClick(self,str11,oprt):
self.dotFlag = False if oprt == +: if self.result == 0: self.result = str11 else: self.result
= string.atof(self.result) + string.atof(str11)elif oprt == -:
if self.result == 0: self.result = str11 else: self.result = string.atof(self.result) - string.atof(str11)
elif str2 == *: if self.result == 0: self.result = str11 else: self.result = string.atof(self.result) * string.atof(str11)
elif str2 == /: if self.result == 0: self.result = str11 else: self.result = string.atof
(self.result) / string.atof(str11)
self.entryWidget.icursor(0) self.entryWidget.delete(0,END) self.entryWidget.insert(INSERT,self.result)
def __init__(self,master):
self.container1 = Frame(master,width=200,height=200,background='') self.container1.pack() self.str1 = StringVar() self.str1 = 0 self.entryWidget = Entry(
self.container1,textvariable=self.str1) self.entryWidget.pack(side=TOP)
self.container2 = Frame(master,background='') self.container2.pack()
self.container3 = Frame(master,background='') self.container3.pack()
self.operand = 0 self.result = 0 self.dotFlag = False
def make_buttons(self): self.buttonOne = Button(self.container2,text='1') self.buttonOne.grid(row=0,column=0) self.buttonTwo = Button(self.container2,text='2') self.buttonTwo.grid
(row=0,column=1) self.buttonThree = Button(self.container2,text='3') self.buttonThree.grid(row=0,column=2) self.buttonFour = Button(self.container2,text='4') self.buttonFour.grid
(row=1,column=0) self.buttonFive = Button(self.container2,text='5') self.buttonFive.grid(row=1,column=1) self.buttonSix = Button(self.container2,text='6') self.buttonSix.grid(row=1,column=2)
self.buttonSeven = Button(self.container2,text='7') self.buttonSeven.grid(row=2,column=0) self.buttonEight = Button(self.container2,text='8') self.buttonEight.grid(row=2,column=1)
self.buttonNine = Button(self.container2,text='9') self.buttonNine.grid(row=2,column=2) self.buttonZero = Button(self.container2,text='0') self.buttonZero.grid(row=3,column=0)
self.buttonPoint = Button(self.container2,text='.') self.buttonPoint.grid(row=3,column=1)
def make_oprbuttons(self): self.buttonPlu = Button(self.container3,text='+',command = lambda: self.oprClick('+',self.str1.get())) self.buttonPlu.pack(side=LEFT)
self.buttonMin = Button(self.container3,text='-',command = lambda: self.oprClick('-',self.str1.get())) self.buttonMin.pack(side=LEFT)
self.buttonMul = Button(self.container3,text='*',command = lambda: self.oprClick('*',self.str1.get())) self.buttonMul.pack(side=LEFT)
self.buttonDiv = Button(self.container3,text='/',command = lambda: self.oprClick('/',self.str1.get())) self.buttonDiv.pack(side=LEFT)
self.buttonEqu = Button(self.container3,text='=',command = lambda: self.oprClick('=',self.str1.get())) self.buttonEqu.pack(side=LEFT)
root = Tk()mycalc = Mycalc(root)mycalc.make_buttons()mycalc.make_oprbuttons()
root.mainloop()
On 10/26/06, Kent Johnson [EMAIL PROTECTED] wrote:
Asrarahmed Kadri wrote: Hi folks, I am trying to build a rudimentary calculator application using Tkinter...
I have used one Entry widget for displaying the input and output data. All this is put in a class. The porblem is when I click teh '+' button, teh callback function is called but it gives me an error message: AttributeError: 'str' object
has no attribute 'get' I have defined a variable, self.str1 = StringVar() to bind it with the entry widget and I am calling the function when + is clciked. The function is as follows:
self.buttonPlu = Button(self.container3,text='+',command = lambda: self.oprClick('+',*self.str1.get()))* Can't we use the get() method to access the contents of the entry widget. Is there any other way to access the contents of the entry
widget???The error message is saying that the object you are calling get() on isa string, not a StringVar. Please post complete code and the completeerror message including traceback.Kent
___Tutor maillist-Tutor@python.orghttp://mail.python.org/mailman/listinfo/tutor
-- To HIM you shall return.
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Code with traceback...Re: Help me.. problem in building calculator application
Immediately following the line
self.str1 = StringVar()
you have
self.str1 = 0
at which point self.str1 is a string, not a StringVar. Maybe you mean
self.str1.set(0)
?
Kent
Asrarahmed Kadri wrote:
Traceback is as under:
Traceback (most recent call last):
File C:\python\lib\lib-tk\Tkinter.py, line 1345, in __call__
return self.func(*args)
File calculator_version2.py, line 105, in lambda
self.buttonPlu = Button(self.container3,text='+',command = lambda:
self.oprC
lick('+',self.str1.get()))
AttributeError: 'str' object has no attribute 'get'
from Tkinter import *
import string
class Mycalc:
def buttonClick(self,str2,str3):
if str2 == .:
if self.dotFlag:
pass
else:
self.dotFlag = True
self.operand = str3 + str2
else:
self.operand = str3 + str2
def oprClick(self,str11,oprt):
self.dotFlag = False
if oprt == +:
if self.result == 0:
self.result = str11
else:
self.result = string.atof(self.result) + string.atof(str11)
elif oprt == -:
if self.result == 0:
self.result = str11
else:
self.result = string.atof(self.result) - string.atof(str11)
elif str2 == *:
if self.result == 0:
self.result = str11
else:
self.result = string.atof(self.result) * string.atof(str11)
elif str2 == /:
if self.result == 0:
self.result = str11
else:
self.result = string.atof (self.result) / string.atof(str11)
self.entryWidget.icursor(0)
self.entryWidget.delete(0,END)
self.entryWidget.insert(INSERT,self.result)
def __init__(self,master):
self.container1 =
Frame(master,width=200,height=200,background='brown')
self.container1.pack()
self.str1 = StringVar()
self.str1 = 0
self.entryWidget = Entry(
self.container1,textvariable=self.str1)
self.entryWidget.pack(side=TOP)
self.container2 = Frame(master,background='cyan')
self.container2.pack()
self.container3 = Frame(master,background='grey')
self.container3.pack()
self.operand = 0
self.result = 0
self.dotFlag = False
def make_buttons(self):
self.buttonOne = Button(self.container2,text='1')
self.buttonOne.grid(row=0,column=0)
self.buttonTwo = Button(self.container2,text='2')
self.buttonTwo.grid (row=0,column=1)
self.buttonThree = Button(self.container2,text='3')
self.buttonThree.grid(row=0,column=2)
self.buttonFour = Button(self.container2,text='4')
self.buttonFour.grid (row=1,column=0)
self.buttonFive = Button(self.container2,text='5')
self.buttonFive.grid(row=1,column=1)
self.buttonSix = Button(self.container2,text='6')
self.buttonSix.grid(row=1,column=2)
self.buttonSeven = Button(self.container2,text='7')
self.buttonSeven.grid(row=2,column=0)
self.buttonEight = Button(self.container2,text='8')
self.buttonEight.grid(row=2,column=1)
self.buttonNine = Button(self.container2,text='9')
self.buttonNine.grid(row=2,column=2)
self.buttonZero = Button(self.container2,text='0')
self.buttonZero.grid(row=3,column=0)
self.buttonPoint = Button(self.container2,text='.')
self.buttonPoint.grid(row=3,column=1)
def make_oprbuttons(self):
self.buttonPlu = Button(self.container3,text='+',command =
lambda: self.oprClick('+',self.str1.get()))
self.buttonPlu.pack(side=LEFT)
self.buttonMin = Button(self.container3,text='-',command =
lambda: self.oprClick('-',self.str1.get()))
self.buttonMin.pack(side=LEFT)
self.buttonMul = Button(self.container3,text='*',command =
lambda: self.oprClick('*',self.str1.get()))
self.buttonMul.pack(side=LEFT)
self.buttonDiv = Button(self.container3,text='/',command =
lambda: self.oprClick('/',self.str1.get()))
self.buttonDiv.pack(side=LEFT)
self.buttonEqu = Button(self.container3,text='=',command =
lambda: self.oprClick('=',self.str1.get()))
self.buttonEqu.pack(side=LEFT)
root = Tk()
mycalc = Mycalc(root)
mycalc.make_buttons()
mycalc.make_oprbuttons()
root.mainloop()
On 10/26/06, *Kent Johnson* [EMAIL PROTECTED] mailto:[EMAIL PROTECTED]
wrote:
Asrarahmed Kadri wrote:
Re: [Tutor] Python and config files?
Actually, for Unixish config files, shlex seems the better module. Andreas Am Donnerstag, den 26.10.2006, 09:24 -0400 schrieb Kent Johnson: Basil Shubin wrote: Hi, friends! Is there exist a module for working with config file? Simple enough, just read/write config file (like for most unix app), determine where row is contain config words with it's parameters (like 'config_word=parameter') or it's a comments (#)? Take a look at the ConfigParser module: http://docs.python.org/lib/module-ConfigParser.html Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor signature.asc Description: Dies ist ein digital signierter Nachrichtenteil ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Code with traceback...Re: Help me.. problem in buildingcalculator application
Kent has already pointed out the problem of overwriting
the stringvar, but there is another problem too:
def oprClick(self,str11,oprt):
self.buttonPlu = Button(self.container3,text='+',
command = lambda: self.oprClick('+',self.str1.get()))
Check the position of the operator string in the definition versus
the lambda call
Alan G.
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
[Tutor] problem importing class
hey therei have written a module called site.pyin the file i have this:import DbConnectorimport sensorclass Site(object): site object def __init__(self, id): self.id = id self.con = DbConnector.DbConnector() id = str(self.id) stats = self.con.getOne(selct `group_id`, `name`, `ivr_code`, \ `site_type`, `notes`, `sensor_id` \ from `sites` where `id` = '+str(id)+' ) self.group_id = stats[0] self.name = stats[1] self.ivr_code = stats[2] self.site_type = stats[3] self.notes = stats[4] self.sensor_id = stats[5] def get_sensor(self): self.sensor = sensor.Sensor (self.sensor_id) return self.sensorok, in the program i am trying to run i have these lines:import sitenew_site = site.Site(id_number)and this is what my output is:Traceback (most recent call last): File ./new_camp.py, line 2014, in on_site_tree_view_row_activated acitve_site = site.Site(id_number)AttributeError: 'module' object has no attribute 'Site'It looks like the same code works for a different module i have ; i don't get what i could be missing here, any tips?if you have read this far, thanks for your time.sk ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem importing class
On 10/26/06, shawn bright [EMAIL PROTECTED] wrote: import site Try this for a clue: print site.__file__ -- Cheers, Simon B [EMAIL PROTECTED] http://www.brunningonline.net/simon/blog/ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem importing class
Shawn,Python already has a module called site. From http://docs.python.org/lib/module-site.html :This module is automatically imported during initialization. The automatic import can be suppressed using the interpreter's -S option. Importing this module will append site-specific paths to the module search path.Easiest thing would be to rename your module.On 10/26/06, shawn bright [EMAIL PROTECTED] wrote:hey therei have written a module called site.pyin the file i have this: import DbConnectorimport sensorclass Site(object): site object def __init__(self, id): self.id = id self.con = DbConnector.DbConnector() id = str( self.id) stats = self.con.getOne(selct `group_id`, `name`, `ivr_code`, \ `site_type`, `notes`, `sensor_id` \ from `sites` where `id` = '+str(id)+' ) self.group_id = stats[0] self.name = stats[1] self.ivr_code = stats[2] self.site_type = stats[3] self.notes = stats[4] self.sensor_id = stats[5] def get_sensor(self): self.sensor = sensor.Sensor (self.sensor_id) return self.sensorok, in the program i am trying to run i have these lines:import sitenew_site = site.Site(id_number)and this is what my output is:Traceback (most recent call last): File ./new_camp.py, line 2014, in on_site_tree_view_row_activated acitve_site = site.Site(id_number)AttributeError: 'module' object has no attribute 'Site'It looks like the same code works for a different module i have ; i don't get what i could be missing here, any tips?if you have read this far, thanks for your time.sk ___Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem importing class
shawn bright wrote: hey there i have written a module called site.py Use a different name, there is a library module called site that is automatically imported when Python starts up. So when you 'import site' you are getting the already-imported library module. Kent in the file i have this: import DbConnector import sensor class Site(object): site object def __init__(self, id): self.id http://self.id = id self.con = DbConnector.DbConnector() id = str(self.id http://self.id) stats = self.con.getOne(selct `group_id`, `name`, `ivr_code`, \ `site_type`, `notes`, `sensor_id` \ from `sites` where `id` = '+str(id)+' ) self.group_id = stats[0] self.name http://self.name = stats[1] self.ivr_code = stats[2] self.site_type = stats[3] self.notes = stats[4] self.sensor_id = stats[5] def get_sensor(self): self.sensor = sensor.Sensor (self.sensor_id) return self.sensor ok, in the program i am trying to run i have these lines: import site new_site = site.Site(id_number) and this is what my output is: Traceback (most recent call last): File ./new_camp.py, line 2014, in on_site_tree_view_row_activated acitve_site = site.Site(id_number) AttributeError: 'module' object has no attribute 'Site' It looks like the same code works for a different module i have ; i don't get what i could be missing here, any tips? if you have read this far, thanks for your time. sk ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem importing class
Hi Shawn, It looks like people have identified the problem, that your site.py module isn't being found because it conflicts with something from Python's Standard Library. This isn't the first time this kind of problem has hit people. This problem is well known and is the subject of a Python Enhancement Proposal (PEP 328). If you're using Python 2.5, you can use a new feature called 'absolute_import' to avoid the import problem. See: http://docs.python.org/whatsnew/pep-328.html for more details. In the meantime, if you can't depend on using Python 2.5 yet, just rename your site.py module to something else to avoid the collision between Python's own site.py module and your own. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] New to programming and Python
First off, I don't know if I'm doing this right, I've never used a mailing list before, so I'm not sure if I'm sending this to the right place. Thanks for all the help you guys gave me ( e vocês também pessoal, é bom saber que há pessoal português por aqui :-) ). I'll try and read as many tutorials as I can and start to work on some programs of my own. Let's hope I can make something useful or fun. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem importing class
Hey thanks for the help, gents,i renamed site.py to site_obj.py and my import and statement.everything is working now. Thank you guys very very much.shawnOn 10/26/06, Danny Yoo [EMAIL PROTECTED] wrote: Hi Shawn,It looks like people have identified the problem, that your site.py moduleisn't being found because it conflicts with something from Python'sStandard Library.This isn't the first time this kind of problem has hit people.This problem is well known and is the subject of a Python Enhancement Proposal(PEP 328).If you're using Python 2.5, you can use a new feature called'absolute_import' to avoid the import problem.See: http://docs.python.org/whatsnew/pep-328.htmlfor more details.In the meantime, if you can't depend on using Python 2.5 yet, just renameyour site.py module to something else to avoid the collision betweenPython's own site.py module and your own. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] New to programming and Python
On Thu, 26 Oct 2006, Jorge Azedo wrote: First off, I don't know if I'm doing this right, I've never used a mailing list before, so I'm not sure if I'm sending this to the right place. Thanks for all the help you guys gave me ( e vocês também pessoal, é bom saber que há pessoal português por aqui :-) ). I'll try and read as many tutorials as I can and start to work on some programs of my own. Let's hope I can make something useful or fun. I'd second the recommendation to Dive into Python; it has great practical examples. Feel free to ask questions on the list; we're all here to help each other. As a non-Python tangent: if you'd like to read a textbook on learning introductory programming, you might be interested in How to Design Programs: http://www.htdp.org/ The first few chapters might feel a little slow, and the language used is not Python. But even with that, the material in the book is top notch, better than most introductory textbooks I've seen. If I were to point someone new to computing toward learning to program, this is the book I'd be oblidged to recommend. Good luck to you!___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] problem importing class
Danny Yoo wrote: Hi Shawn, It looks like people have identified the problem, that your site.py module isn't being found because it conflicts with something from Python's Standard Library. This isn't the first time this kind of problem has hit people. This problem is well known and is the subject of a Python Enhancement Proposal (PEP 328). If you're using Python 2.5, you can use a new feature called 'absolute_import' to avoid the import problem. See: http://docs.python.org/whatsnew/pep-328.html for more details. Hmm, I don't see how that would help since AFAICT shawn's site.py is not in a package. Or maybe I don't understand what you are suggesting? Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Self, Scopes and my unbelievable muddleheadedness.
On 10/25/06, Luke Paireepinart [EMAIL PROTECTED] wrote: I'm sure this is so obvious that a crack-addled tapeworm head down in a bucket of stupid could understand it, unfortunately, I'm not quite at that level today. Sorry.Uh, I don't understand why you're passing Fields to the functions but then putting the value in self.Fields...but we'll ignore that for now :) http://www.penzilla.net/tutorials/python/modules/ I explain my confusion more coherently in my reply to Mr. Gald. :-) The problem it sounds like you're having is that you think that passinglists to functions copies them, when in fact it just creates a reference to them.Take this, for example: Close! I thought that self would somehow automagically create a copy of the list, leaving a global intact. I am disillusioned. def append_five(alist):alist.append(5) a = [1,2,3,4] append_five(a) a[1, 2, 3, 4, 5] append_five(a) a[1, 2, 3, 4, 5, 5] Which answers my question why is my list of dictionaries turning in to a list with a dictionary with a list of dictionaries therein! :-) Other than that,Maybe you think self is used for something other than what it's intended to be used for...but I can't be sure. Again, see my reply to Mr. Gald. I am starting to get my head around self. I searched usenet for explanations, apparently I'm not the only one. :-). It seems to be pretty simple, for most. I'm reminded of learning to solve for polynomials or diagram sentences: It's elementary to some and completely obtuse to others, depending on mindset and experience. I'm sure someone else can give you a good example.I, however, have to run. HTH,-Luke Thanks! I appreciate it! ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Fwd: Self, Scopes and my unbelievable muddleheadedness.
-- Forwarded message --From: doug shawhan [EMAIL PROTECTED]Date: Oct 26, 2006 1:45 PM Subject: Re: [Tutor] Self, Scopes and my unbelievable muddleheadedness.To: Alan Gauld [EMAIL PROTECTED] On 10/26/06, Alan Gauld [EMAIL PROTECTED] wrote: doug shawhan [EMAIL PROTECTED] wrote I'm having a rather difficult time understanding the proper use of self.Doug, I think you may be having a more fundamental problem. Looking at your code at the most superficial level it seemsyou may not understand objects. I've always been confused by much of the OOP terminology. I'm about to go off on a tangent below regarding your explaination. I think it is helping me, but I want to be sure. Bear with me. :-) My original question should have been: Why is this dictionary coming back weird? The dictionary was just a placeholder for a future .ini file to be read with ConfigParser. In playing around with different ideas. I thought I'd like to put each particular set of activities into modules anyway, so let's just figure out how that might work. I ran onto the problem of the dictionary being changed globally, when I thought that use of self meant that any changes to that data were limited to the scope of the method in that particular class (and it's resultant object), thereby insulating it from other methods in the same class and other objects which inherit from the same class (Don't reply to this yet! :-) I'm sure that I have simply thought that my global declaration was not going to be changed in place by misunderstanding what self means. My confusion stemmed from just how weird the change appeard to be. I.e. But I just looked at the dang thing and it was what I expected! Where dem extra parentheis come from? Huh? I apologize for my incoherence in asking the question. I was in the middle of trying out different ideas and ran onto this weirdness and could not let it go. I should taken the time to write a generic example, but frankly, I was frustrated and was not thinking about how best to frame the question. It was impolite of me to subject the list to my half-baked meanderings. Again, sorry. You guys have helped so much and you deserve a little more effort on my part. So, fortified with 8 hours of sleep and 15mg of Adderall, here we go! Classes are used to generate objects. Objects represent things.By logical deduction objects correspond to nouns in language. Objects do things when they receive messages (Possiblyfrom other objects). Messages cause methods to be invoked,methods therefore correspond to verbs in language. I felt like I was being told an integer is a counting number here. ;-) Looking at your code we find:class Create: # a verbdef freshDB(self, DBPATH, Fields): # a noun def comparisonTable(self, DBPATH, Fields, columns, mode): #a nounIn other words you have the concept inside out.you are trying to create Create objects and call Table and Databasemethods. It doesn't make sense. Normally we would expect to see DB and Table objects to whichyou send create messages. I was even more confused. Were you objecting to my nomenclature? So I thought, If I named the class Steve and called the methods createFreshDB() and createComparisonTable() so it would read: Steve, create a fresh database which includes tables named for the keys and columns named for the values in this dictionary I'm handing you. Steve, create a comparison table just like above, but with a different key. which would be followed (eventually, if I hadn't gotten bogged down) by Steve, tell gadfly to collate those two tables I just had you make and put them in another table so I can generate a report Would that make any difference? No especially in how the code was written (it was still ugly and half-baked, and showing tons of bad habits), but I did suddenly realize what you meant by noun. I have been treating objects like a corporate sales droid treats nouns. I've been Gifting and Tableing the objects TheGift and TheTable in my mind. (I fear I've also been Impacting the method impact() without asking Steve.Please() first, (I.E. not quite understanding why my classes within the modules were not showing up like I expected, but that's another story.) I've not been thinking of an object as a verb, rather more like a gerund. Still wrong, but a different kind of wrong. Now if you think of the objects as verbs then self is a confusing concept. But if you think of the objects as nouns then self is simply areferenceto the object instance in question, a particular database or table. Which leads me back to the why is it there? question I saw on the list recently. If self is simply a reference to the object instance in question, then why does one have to basically mirror the variable at the top of the class? The example I was working from is at: http://www.penzilla.net/tutorials/python/modules/ # Intro To Python: Modules# book.pyClass: Book( title, author, keywords )Each book object takes a title, optional author, and optional
[Tutor] Mailing list question
Not so much a question about Python, but here goes: How do I reply to a specific thread in the mailing list? If I place Re:bla bla in the subject line, I notice that I start a new thread, I don't continue one that already exists. How do I go about doing this? Thanks for any info ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Mailing list question
Jorge Azedo wrote: Not so much a question about Python, but here goes: How do I reply to a specific thread in the mailing list? If I place Re:bla bla in the subject line, I notice that I start a new thread, I don't continue one that already exists. How do I go about doing this? Thanks for any info What e-mail client are you using? Most have a reply-to-all button you can use so that you won't have to start a new message to reply to someone. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Mailing list question
Not so much a question about Python, but here goes: How do I reply to a specific thread in the mailing list? If I place Re:bla bla in the subject line, I notice that I start a new thread, I don't continue one that already exists. How do I go about doing this? Thanks for any info What e-mail client are you using? Most have a reply-to-all button you can use so that you won't have to start a new message to reply to someone. There's a little bit of extra information that Mailman uses to detect threads. The archives don't cluster messages based on the subject line, but instead use a specific header value whose name I'm completely forgetting right now... *grin* (I think it's the 'In-Reply-To' header line.) Your email client should be the one responsible for maintaining that threading information. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Help me.. problem in building calculator application
Message: 7 Date: Thu, 26 Oct 2006 13:31:37 +0100 From: Asrarahmed Kadri [EMAIL PROTECTED] Subject: [Tutor] Help me.. problem in building calculator application To: pythontutor tutor@python.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=iso-8859-1 Hi folks, I am trying to build a rudimentary calculator application using Tkinter... Hi, Asrar! Try this article instead: http://www.devshed.com/c/a/Python/Designing-a-Calculator-in-wxPython/ Paulino ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Mailing list question
Danny Yoo wrote: Not so much a question about Python, but here goes: How do I reply to a specific thread in the mailing list? If I place Re:bla bla in the subject line, I notice that I start a new thread, I don't continue one that already exists. How do I go about doing this? Thanks for any info What e-mail client are you using? Most have a reply-to-all button you can use so that you won't have to start a new message to reply to someone. There's a little bit of extra information that Mailman uses to detect threads. The archives don't cluster messages based on the subject line, but instead use a specific header value whose name I'm completely forgetting right now... *grin* (I think it's the 'In-Reply-To' header line.) Your email client should be the one responsible for maintaining that threading information. I'm trying to use the Reply All button on my mail client (I use Thunderbird, by the way) like you guys suggested. Let's see if it works :-P ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Fwd: Self, Scopes and my unbelievable muddleheadedness.
doug shawhan wrote:
[lots of stuff!]
You seem to have a penchant for choosing entertaining, albeit confusing,
words to explain what you're thinking.
I have a similar inclination; however, I'll attempt to avoid this so
that my explanation will make more sense :)
Now we begin.
First, an example, then an explanation.
#given the following definition...
class AClass(object):
aClassVariable = 'Hello'
def aMethod(self):
print self.hello
def __init__(self):
self.hello = Hi!
AClass.aClassVariable
'Hello'
anInstance = AClass()
AClass.hello
Traceback (most recent call last):
File pyshell#9, line 1, in ?
AClass.hello
AttributeError: type object 'AClass' has no attribute 'hello'
anInstance.hello
'Hi!'
AClass.aMethod()
Traceback (most recent call last):
File pyshell#13, line 1, in ?
AClass.aMethod()
TypeError: unbound method aMethod() must be called with AClass instance
as first argument (got nothing instead)
anInstance.aMethod()
Hi!
anInstance.aClassVariable
'Hello'
anInstance.aClassVariable = 'Ho!'
anInstance.aClassVariable
'Ho!'
AClass.aClassVariable
'Hello'
# end of example.
Believe it or not, this short example should tell you everything you
need to know about objects ;)
However, that doesn't mean it makes any sense!
So I will try to explain it.
I had a huge problem with Objects when I first ran into them, but now
they're easy to understand.
Hope I can do the same for you.
Okay, take this example:
class aClass(object):
aVariable = 'hi'
What the interpreter does is creates a variable called aClass that
points to this object.
Yes, class definitions are objects.
aClass
class '__main__.aClass'
Since the variable that we defined in the aClass object was defined in
the main scope of the class,
and not in a class method (it wasn't defined inside a function that was
in the class) it's global to the class object.
so...
aClass.aVariable
'hi'
we don't even need to make an instance of the class to access this variable.
We can make an instance if we want...
b = aClass()
b.aVariable
'hi'
But there's really no point, is there?
Now take this class.
class aClass(object):
value = 'hi'
def __init__(self):
self.value = 'hello'
Because the 'self.value' is only defined inside of the '__init__'
method, it's not global to the class definition,
but the 'value' variable is global to the class definition.
aClass.value
'hi'
But when we make an instance of this class,
instance = aClass()
The init method is called,
instance.value
'hello'
which replaces the class-global 'value' variable with the
instance-global 'self.variable' version.
One thing it's important to note is this:
#given these two definitions
class aClass(object):
aVar = 1
aList = [1,2,3]
b = aClass()
#we get this.
aClass.aVar
1
aClass.aList
[1, 2, 3]
b.aVar
1
b.aList
[1, 2, 3]
b.aVar = 23
b.aList.append(4)
b.aVar
23
b.aList
[1, 2, 3, 4]
aClass.aVar
1
aClass.aList
[1, 2, 3, 4]
Notice how changing the value of b.aList changes the value of
aClass.aList? So any object you make after this,
a = aClass()
a.aList
[1, 2, 3, 4]
will have the modified value of aList,
a.aVar
1
but not the modified version of aVar.
However, if you were to change aVar in the class definition (and not in
an instance of the class)
aClass.aVar = 2
a.aVar
2
then the value of aVar is changed.
This is interesting and a little scary, since changing a list in an
instance can change this list in all class instances,
but not if it's an integer or a tuple or something else.
This is a good reason to use 'self'.
That way, each class has its own set of data that can't be messed with.
You say in your e-mail
Does it follow that if one does not prepend self to the variable, any
change will affect all instances of an object (say in a threading
situation)? That is the only thing that seems to make sense to me,
otherwise self would just be silly.
No, this is not the point of self at all.
Imagine that you have this class.
class Poem(object):
def __init__(self,title,text): #args: string, list of strings
self.title = title
self.text = text
def readPoem(self):
print Poem: %s % self.title
for line in self.text:
print line
def reversePoem(self):
self.text.reverse()
Now say you want two poems...
aolHaiku = Poem('Unwanted AOL CD Haiku',['A shiny let-down,','AOL
CDs are good','Only for artwork'])
windowsHaiku = Poem('Microsoft Haiku',['Yesterday it
worked.','Today it is not working.','Windows is like that.'])
And you want to read them.
aolHaiku.readPoem()
Poem: Unwanted AOL CD Haiku
A shiny let-down,
AOL CDs are good
Only for artwork
windowsHaiku.readPoem()
Poem: Microsoft Haiku
Yesterday it worked.
Today it is not working.
Windows is like that.
So it doesn't matter to us what's acually _in_ each class instance, we
know if we call the readPoem on the Poem object, it'll do
Re: [Tutor] Mailing list question
I'm trying to use the Reply All button on my mail client (I use Thunderbird, by the way) like you guys suggested. Let's see if it works :-P That's what I use (Reply All and Thunderbird) and whenever I check my gmail account from the website, the messages I write appear threaded correctly. Well, that's assuming threading is the same as gmail conversations. Hope that helps ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Self, Scopes and my unbelievable muddleheadedness.
I ran onto the problem of the dictionary being changed globally,
when I
thought that use of self meant that any changes to that data were
limited
to the scope of the method in that particular class
No, but you know that now :-)
Let me try an alternative explanaytion for self, since we already had
a discussion about self recently...
self is simply a pointer to the object whose method is being called.
Lets try writing some OO code without using Pythons OOP
mechanism and see if we can spot why we need self (whether
implicitly or explicitly).
First we need a way to create objects since we dont have
classes...so we write a function that returns a dictionary.
We'll make it simple and have a message class that stores
a string and has a display method.
def display(aMessage):
print aMessage['text']
def Message(theText):
theObject = {}
theObject['text'] = theText
return theObject
Now we create a couple of instances and display them:
m1 = createMessage('Good morning')
m2 = createMessage('Hello world')
display(m1)
display(m2)
Notice how we need to pass the instance that we want
to display into the display function?
Now lets write the same thing using real OOP:
class Message:
def __init__(self, theText):
self.text = theText
def display(self):
print self.text
m1 = Message('Good morning')
m2 = Message('Hello world')
Message.display(m1)
Message.display(m2)
If you compare the definition of the display function and
the definition of the display method can you see the similarity,
and the correspondence of self to aMessage?
Now look at the two calls to display in the real OOP example.
Can you see the similarity to the calls to display in the non OOP
version?
Again can you see the correspondence between the values
passed in to the function and the values passed via the class.
In both cases its m1,m2, ie the instances we created.
In both cases the function needs those values to know
which objects message it should print.
Finally we have the more conventionalOOP notation for calling
methods:
m1.display()
m2.display()
These are exactly the same as the previous calls via the
Message class, but are more intuitive (once you start
feeling comfortable with OOP notation as used with strings
and the like)
I've never tried explaining self with that set of examples so
it may have confused things even more! But maybe its more
conventional approach to functions v methods might make sense.
The final caveat is that message dispatch gets more complex
when you factor in inheritance so the simple non OOP example
breaks down fairly quickly...
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Mailing list question
I just use the reply button in my Thunderbird, and then change the email I want to send to tutor@python.org Jorge Azedo escreveu: Danny Yoo wrote: Not so much a question about Python, but here goes: How do I reply to a specific thread in the mailing list? If I place Re:bla bla in the subject line, I notice that I start a new thread, I don't continue one that already exists. How do I go about doing this? Thanks for any info What e-mail client are you using? Most have a reply-to-all button you can use so that you won't have to start a new message to reply to someone. There's a little bit of extra information that Mailman uses to detect threads. The archives don't cluster messages based on the subject line, but instead use a specific header value whose name I'm completely forgetting right now... *grin* (I think it's the 'In-Reply-To' header line.) Your email client should be the one responsible for maintaining that threading information. I'm trying to use the Reply All button on my mail client (I use Thunderbird, by the way) like you guys suggested. Let's see if it works :-P ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Mailing list question
Jorge Azedo [EMAIL PROTECTED] wrote How do I reply to a specific thread in the mailing list? Just hit Reply All. There should be a command or button in your mail tool to do that, even if you use web mail. -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Self, Scopes and my unbelievable muddleheadedness.
Replying to my own post, how sad...
Alan Gauld [EMAIL PROTECTED] wrote
First we need a way to create objects since we dont have
classes...so we write a function that returns a dictionary.
We'll make it simple and have a message class that stores
a string and has a display method.
def display(aMessage):
print aMessage['text']
def Message(theText):
theObject = {}
theObject['text'] = theText
return theObject
Oops I lost the plot somewhere here, the create function
should have been called createMessage and looked like:
def createMessage(theText):
theObject = {}
theObject['text'] = theText
theObject['display'] = display
return theObject
Now we create a couple of instances and display them:
m1 = createMessage('Good morning')
m2 = createMessage('Hello world')
display(m1)
display(m2)
And the display calls should have been via the dictionary:
m1['display'](m1)
m2['display'](m2)
Notice how we need to pass the instance that we want
to display into the display call?
And that should make more sense and be closer to the true
OOP version...
Now lets write the same thing using real OOP:
class Message:
def __init__(self, theText):
self.text = theText
def display(self):
print self.text
m1 = Message('Good morning')
m2 = Message('Hello world')
Message.display(m1)
Message.display(m2)
If you compare the definition of the display function and
the definition of the display method can you see the similarity,
and the correspondence of self to aMessage?
Now look at the two calls to display in the real OOP example.
Can you see the similarity to the calls to display in the non OOP
version?
Again can you see the correspondence between the values
passed in to the function and the values passed via the class.
In both cases its m1,m2, ie the instances we created.
In both cases the function needs those values to know
which objects message it should print.
Finally we have the more conventionalOOP notation for calling
methods:
m1.display()
m2.display()
These are exactly the same as the previous calls via the
Message class, but are more intuitive (once you start
feeling comfortable with OOP notation as used with strings
and the like)
I've never tried explaining self with that set of examples so
it may have confused things even more! But maybe its more
conventional approach to functions v methods might make sense.
The final caveat is that message dispatch gets more complex
when you factor in inheritance so the simple non OOP example
breaks down fairly quickly...
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Mailing list question
rolando wrote: I just use the reply button in my Thunderbird, and then change the email I want to send to tutor@python.org It's better to use reply-all, in my opinion, because then, if someone's involved in an e-mail thread, they'll get an instant update on it even if they only get the Tutor Digest and not every individual mail. Cheers, -Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Mailing list question
Greetings everyone... I use Thunderbird, too. I've noticed that it handles threads a bit strange...for instance, I have pytutor set up to send me copies of my replies (so I can track threads better), but Thunderbird won't display my replies inline with the threads... If you go to the folder you want to see threads in, then click on view, you can look at your thread settings. Under sort by you should be able to set Threaded or unthreaded, and under Threads (under the view menu) you should have it set to all. I know that there are subtle differences between Firefox for Windows and Firefox for *nix, but I don't know about Thunderbird. If you're using Windows, there might be slight differences between what you see what I see in the menus. I don't know if that helps at all, but that's how I have Thunderbird set up when it comes to threads. Jonathon Alan Gauld wrote: Jorge Azedo [EMAIL PROTECTED] wrote How do I reply to a specific thread in the mailing list? Just hit Reply All. There should be a command or button in your mail tool to do that, even if you use web mail. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
