[Tutor] using quotes in IDLE
A really dumb question... When typing things into IDLE, how are quotes meant to work? If I type" employee.name = "Susan" then IDLE ignores the last " and I get an error. Jim ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Something I don't understand
Below, "student_seats" is a list of the class "student". Why does this code set every student.row to zero when there is only one student in the list with row > 5? It still sets them all to zero if I change the test to ">200" when there are no student.rows > 200. But if I change the test to "<1" then nothing gets set to zero. Jim class student: def __init__ (self, name, row, column): self.name = name self.row = row self.column = column for student in student_seats: print student.name, "row = ", student.row, "column = ", student.column if student.row > 5: student.row = 0 print student.name, "row = ", student.row, "column = ", student.column ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Oops:
I solved my last problem. The data was string data and of course '1' is > 5. Now, if I take int(string) the code will work, except it crashes out when the data is null. student.row = int(student.row) ValueError: invalid literal for int() with base 10: '' What is the easiest and recomended way of turning the strings into numerics? Jim ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Placing entire Application inside a class
I have just read through "Creating a GUI in Python - by Dakota Lemaster" In it, Dakota recomends placing the entire application within a class. Why is this so? Surely in many cases you end up with a constructor for the class that is cumbersome and complex? Is this a recomended Python programming technique? http://student-iat.ubalt.edu/sde/students/lemaster/COSC330/Final/sec4_AppClass.html Why is this so? Surely in many cases you end up with a constructor for the class that is cumbersome and complex? Is this a recomended Python programming technique? Jim ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] constants, flags or whatever
In a program, I want to set some kind of variable or object to indicate what "mode" the program is currently in. What is the most elegant way of doing this? Jim --- constant: moving = "m" constant: inserting = "i" constant:jumping = "j" . . action = moving . . . if action == jumping: jumpSomewhere() elseif action == moving: moveSomewhere() elseif action == inserting: insertSomething() ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] re-initialising shells
I have had a couple of strange cases I don't understand. I am using IDLE on Windows My program imports some stuff from another file using the statement "from qwerty import *" I have changed qwerty and saved it away. I have then run my program (F5) and the program acts as if it is using an old version of qwerty. I close down all my python windows, start it again and the changes are picked up. What are the rules with "shells" and so on? Jim ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Microsoft Access
Are there any simple tutorials on using MS Access from Python? Jim ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Microsoft Access
This tutorial seems very specific to PythonWin IDE. I haven't tried it, but it
seems to imply that it uses stuff from PythonWin IDE that may not be available
in IDLE. Does PythonWin IDE come with any extras that aren't available in
standard Python?
- Original Message -
From: Darren Williams
To: Jim Morcombe ; tutor@python.org
Sent: Friday, December 28, 2007 11:12 AM
Subject: Re: [Tutor] Microsoft Access
Typing 'Using MS Access from Python' into Google returned a few results, one
in particular - http://wwwmarkcarter.me.uk/computing/python/ado.html
Hope that helps.
- Original Message -
From: Jim Morcombe
To: python tutor mailing list
Sent: Friday, December 28, 2007 1:38 AM
Subject: [Tutor] Microsoft Access
Are there any simple tutorials on using MS Access from Python?
Jim
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[Tutor] Closing GUI program
I have copied the following program. When I run it, (By pressing F5 from IDLE), it displays the "Hello world" message. When I close the window, the "Hello world" message disappears, but it seems that the program is still running, because when I close the shell, i get the message "The program is still running. Do you want to kill it?" How do I get the program to terminate when the window is closed? Jim ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Closing GUI program
Oops! Here's the program: --- from Tkinter import * root = Tk() z = Label(root, text="Hello World!") z.grid() root.mainloop() -- Jim - Original Message ----- From: Jim Morcombe To: python tutor mailing list Sent: Friday, December 28, 2007 3:51 PM Subject: [Tutor] Closing GUI program I have copied the following program. When I run it, (By pressing F5 from IDLE), it displays the "Hello world" message. When I close the window, the "Hello world" message disappears, but it seems that the program is still running, because when I close the shell, i get the message "The program is still running. Do you want to kill it?" How do I get the program to terminate when the window is closed? Jim -- ___ 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] destroying windows
I want to have a program that uses Tkinter to display a window.
If the user selects an option, then I want to destroy that window and
then display a second window.
In turn, the user can select an option to change back to the first
window and I want to destroy that window and then display the first again.
I have pasted my code below. The window is successfully created.
However, I can't figure out the correct way to destroy it.
In my first attempt, "window1" is not defined when I go to destroy it
and I am not sure how to make "window1" global or what.
The error is displayed at the bottom of the program listing.
Jim
--
from Tkinter import *
class display_Colour_Selector_window():
def __init__(self):
window1 = Tk()
window1.title("Colour Selector")
menubar = Menu(window1)
# create pulldown menus
editmenu = Menu(menubar, tearoff=0)
editmenu.add_command(label="Colour Selector",
command=change_to_Colour_Selector)
editmenu.add_command(label="Colour Picker",
command=change_to_Colour_Picker)
menubar.add_cascade(label="Edit", menu=editmenu)
# display the menu
window1.config(menu=menubar)
class display_Colour_Picker_window():
def __init__(self):
# The second window will be used for the "Colour Picker" which
# allows the User to pick colours from a colour map.
window2 = Tk()
window2.title("Colour Picker")
menubar = Menu(window2)
# create pulldown menus
editmenu = Menu(menubar, tearoff=0)
editmenu.add_command(label="Colour Selector",
command=change_to_Colour_Selector)
editmenu.add_command(label="Colour Picker",
command=change_to_Colour_Picker)
menubar.add_cascade(label="Edit", menu=editmenu)
# display the menu
window2.config(menu=menubar)
def change_to_Colour_Selector():
display_Colour_Picker_window.window2.destroy
display_Colour_Selector_window()
def change_to_Colour_Picker():
display_Colour_Selector_window.window1.destroy
display_Colour_Picker_window()
def hello():
print "hello!"
##
# The program starts here#
##
display_Colour_Selector_window()
# To run this from IDLE, I will just comment out the mainloop()
# because IDLE is written in Tkinter and actually has its own mainloop()
# running, which thoroughly confuses my own program.
# mainloop()
---
The error:
IDLE 1.2.1 No Subprocess
>>>
>>> Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python25\lib\lib-tk\Tkinter.py", line 1403, in __call__
return self.func(*args)
File "D:/ComputerScienceProgramming/test.py", line 53, in
change_to_Colour_Picker
display_Colour_Selector_window.window1.destroy
AttributeError: class display_Colour_Selector_window has no attribute
'window1'
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[Tutor] regular expressions
Could someone please give me some help using the "re" module.
This works:
import re
text = "Jim is a good guy"
s2 = re.sub('Jim', 'Fred', text)
print s2
and I get "Fred is a good guy"
-
If I have:
text = "Bill Smith is nice"
how do I get rid of "Smith" and just have
"Bill is nice"
I tried
s2 = re.sub('Smith', '', text)
but it complained.
If I have:
text = "Jim likes a girl (Susan)"
and I want to get rid of "(Susan)", how do I do this.
First, the "(" seems to muck things up.
Second, how do I just use "re" to delete characters. I tried using
"sub", but it doesn't seem to like
Jim Morcombe
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[Tutor] names and variables
I have an object called "myObject" with an attribute called "colour". If I type: print myObject.colour then python prints: red Now, I have a variable "myAttribute" and set its value to "colour" by typing: myAttribute = "colour" I want to have a line of code: something like this: print myObject.myAttribute and have Python interpret it as meaning "print myObject.colour" and hence print "red" Can this be done? If so, how? Jim Morcombe ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Calling Python Programs from Word, pdfs, etc
I am thinking about some long term teaching aids, so I'm simply interested in whether these things can be done. I don't need to know how yet. 1. Is it possible to invoke a Python Program from some kind of link in a Word document, similar to the way a Java Applet is run from a Web Page. Obviously I am thinking about a Windows enviroinment only. (I guess I'm probably asking if an exe file can be launched from Winows) 2. How about from a pdf document? 3. I've never used any ebook creation software (and this is probably not the right place to ask) but does anyone have any experience with ebooks that launch Python Applications? Jim ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Simple physics simulations)
I want to write a program that helps teach students how to draw ray diagrams for lenses and mirrors. Vpython seems to be used for a number of physics simulations, but may be overkill for my application. Although there are a few 3D things I would like to do, most just involves drawing curves and simple objects, and allowing the User to do the same. So the question - What is the best thing to use to draw and manipulate simple 2D objects in an application like this? Jim Morcombe ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Finding the IP address for your own PC
Hopefully this is an easy one. How do you get the IP address of the Windows PC that your Python program is running on? Jim Morcombe ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Multi-User file system
I want to have a couple of files that can be updated simultaneously be several users. I don't want to go to the effort of having the users set up a RDMS and would like to control everything from Python. I am after something like shelve, but with record locking. Is there such a thing? Jim Morcombe ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Multi-User file system
Would pySQLite be a reasonable choice for this? Jim Morcombe Jim Morcombe wrote: I want to have a couple of files that can be updated simultaneously be several users. I don't want to go to the effort of having the users set up a RDMS and would like to control everything from Python. I am after something like shelve, but with record locking. Is there such a thing? Jim Morcombe ___ 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] Using Python to replace javascript
Is there any way to write python code inside a HTML page instead of using Javascript? Jim ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] cgi scripts
I want to print a list of the keys and their values passed to a cgi script by an HTML form. I have tried this, but just seems to crash. Any ideas? Jim Morcombe #!C:\python25\python.exe import cgi, sys # import cgitb; cgitb.enable() #Send errors to browser sys.stderr = sys.stdout #Parse data from form data = cgi.FieldStorage() #Send response to browser print "Content-type: text/html\n" print "CGI Form Response\n" print "This is the data passed to the cgi script" print "These are the keys\n" print "" print for k in data.keys(): print "key: ", k, " value: ", data[k] ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] cgi scripts
Bt "Crash", I mean the browser displays: Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. The code I sent before had a silly mistake in it. Here is a better example of the things I am trying and failing at. I can print a single key. I can iterate over the keys, just printing out "hello" for each iteration. But I can't figure out how to iterate over all the keys printing out somethinf sensible. #!C:\python25\python.exe import cgi, sys # import cgitb; cgitb.enable() #Send errors to browser sys.stderr = sys.stdout #Parse data from form data = cgi.FieldStorage() #Send response to browser print "Content-type: text/html\n" print "CGI Form Response\n" print "This is the data passed to the cgi script" # This next bit works and I can see a list of keys displayed in the browser print "Version 4: data.keys()\n" print "" print data.keys() # This next bit also works and I can see the value of the variable "JQuiz_q01_score" print "-" print "JQuiz_q01_score = ", data["JQuiz_q01_score"].value # However, whenever I try to iterate over all the keys, I get the "Internal Server error" print "-" for k in data.keys(): print ""data[k].key # I have also tried data[k] #data.key[k] #data[k].value # and many other random combinations. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] cgi scripts
Thanks guys, This works :) field_list = '\n' for field in data.keys(): field_list = field_list + '%s : %s\n' % (field, data[field].value) field_list = field_list + '\n' print field_list I think the problem wasn't in getting the keys and values, but I might have been producing illegal HTML code before. I think I'd better brush up on my HTML skills. Jim Alan Gauld wrote: "Jim Morcombe" <[EMAIL PROTECTED]> wrote The code I sent before had a silly mistake in it. Here is a better example of the things I am trying and failing at. Look at what you are doing in the two examples # This next bit also works and I can see the value of the variable print "JQuiz_q01_score = ", data["JQuiz_q01_score"].value # However, whenever I try to iterate over all the keys, I get the print ""data[k].key Can you see what you are doing differently whwen accessing the data? HTH, ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] cgi scripts
Actually, that's good to know. I was thinking it was going to be pretty hard to debug if I couldn't tell the difference between HTML errors and Python errors. I have been using import cgitb; cgitb.enable() It seems to re-direct some of the errors to the browser, but obviously not all. Jim Don Jennings wrote: Hi, Jim. Actually, improper HTML would cause a problem with the browser and what it may or may not display. An "Internal Server Error" does indicate that you had a problem with your code. I suggest referring back to Alan's post again. Take care, Don ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] cgi on novell/Appache
I have a cgi script that I want to get running on an Apache server running under Novel. I know absolutely nothing about novell. I need to have the first line of the script point to the Python interpretter, but have no idea where it is. (I don't have access to the server to play around on it. I have to change the script, give it to the admin guy and let him load it. He knows nothing about cgi, python, etc. ) What is the novel equivalent of "/usr/bin/python"? Jim ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
