Re: Tkinter widgets into classes.

2014-02-01 Thread albert visser 
On Sun, 02 Feb 2014 00:07:00 +0100, Lewis Wood   
wrote:



On Saturday, 1 February 2014 22:26:17 UTC, Dave Angel  wrote:

Lewis Wood  Wrote in message:

(snip)


DaveA


It does, this is the whole code:

from tkinter import *

root=Tk()
root.title("Second Root Testing")



def secondwindow():
root2=Tk()
root2.mainloop()

this may seem to work, but you're starting a new event loop here instead  
of using the current one. I think you want to create another TopLevel()  
window here, not a new Tk instance.


button1=Button(root,text="Root2",command=secondwindow).grid(row=0,column=0)

Note that if you want to be able to actually use the button1 symbol, you  
have to break this statement up:


button1=Button(root,text="Root2",command=secondwindow)
button1.grid(row=0,column=0)

You can't shortcut this because grid() returns None.


root.mainloop()




--
Vriendelijke groeten / Kind regards,

Albert Visser

Using Opera's mail client: http://www.opera.com/mail/
--
https://mail.python.org/mailman/listinfo/python-list

Re: Is vars() the most useless Python built-in ever?

2015-12-02 Thread Albert Visser 
On Tue, 01 Dec 2015 22:15:08 +0100, Rick Johnson  
 wrote:



On Tuesday, December 1, 2015 at 10:56:27 AM UTC-6, John Gordon wrote:

Rick Johnson writes:
> Your lament does remind me of a pet peeve i have concerning Python,  
and

> that is, the lie about: "THERE SHOULD BE ONE (AND PREFERABLY ONLY ONE)
> WAY TO DO IT!". In fact, in python there is almost always *MANY* ways  
to

> achieve the same output.=20

The koan reads:

There should be one-- and preferably only one --obvious way to do  
it.


You left out the rather important word "obvious".


Indeed you are correct about the wording, but your interpretation is  
wrong.


Mm, not so much. What you're describing is a statement like "There should  
be one way and it should be obvious".


--
Vriendelijke groeten / Kind regards,

Albert Visser

Using Opera's mail client: http://www.opera.com/mail/
--
https://mail.python.org/mailman/listinfo/python-list

Re: Need help on a project To :"Create a class called BankAccount with the following parameters "

2016-03-05 Thread Albert Visser 

On Sat, 05 Mar 2016 08:41:39 +0100,  wrote:


On Saturday, December 12, 2015 at 1:05:29 AM UTC-8, Harbey Leke wrote:

Create a class called BankAccount

.Create a constructor that takes in an integer and assigns this to a  
`balance` property.


.Create a method called `deposit` that takes in cash deposit amount and  
updates the balance accordingly.


.Create a method called `withdraw` that takes in cash withdrawal amount  
and updates the balance accordingly. if amount is greater than balance  
return `"invalid transaction"`


.Create a subclass MinimumBalanceAccount of the BankAccount class

Please i need help on this i am a beginer into python programming.


Also below is a test case given for this project


import unittest
class AccountBalanceTestCases(unittest.TestCase):
  def setUp(self):
self.my_account = BankAccount(90)

  def test_balance(self):
self.assertEqual(self.my_account.balance, 90, msg='Account Balance  
Invalid')


  def test_deposit(self):
self.my_account.deposit(90)
self.assertEqual(self.my_account.balance, 180, msg='Deposit method  
inaccurate')


  def test_withdraw(self):
self.my_account.withdraw(40)
self.assertEqual(self.my_account.balance, 50, msg='Withdraw method  
inaccurate')


  def test_invalid_operation(self):
self.assertEqual(self.my_account.withdraw(1000), "invalid  
transaction", msg='Invalid transaction')


  def test_sub_class(self):
self.assertTrue(issubclass(MinimumBalanceAccount, BankAccount),  
msg='No true subclass of BankAccount')


my solution is:

class BankAccount(object):
def __init__(self, initial_balance):
self.balance = initial_balance
def deposit(self, amount):
self.balance +=amount
def withdraw(self, amount):
  if self.balance>= amount:
  self.balance  -=  amount
  else:
return invalid transaction
a1 = BankAccount (90)
a1.deposit(90)
a1.withdraw(40)
a1.withdraw(1000)
class MinimumBalanceAccount(BankAccount):
  def __init__(self):
BankAccount.__init__(self,minimum_balance)
self.minimum_balance = minimum_balance
my_account = BankAccount(90)
my_account.withdraw(40)
print my_account.balance


It keeps alerting me that,"Error running your script".Where might I have  
gone wrong?Please help..


Most probably there's extra information available on the "Error running  
your script" message. You should examine that.

Meanwhile, I think the line "return invalid transaction" provides a clue.

--
Vriendelijke groeten / Kind regards,

Albert Visser

Using Opera's mail client: http://www.opera.com/mail/
--
https://mail.python.org/mailman/listinfo/python-list

Re: I am out of trial and error again Lists

2014-10-24 Thread Albert Visser 
On Fri, 24 Oct 2014 19:03:47 +0200, Seymore4Head  
 wrote:




http://i.imgur.com/DTc5zoL.jpg

The interpreter.   I don't know how to use that either.



It's what's on the left hand side of your screenshot. You can simply type  
Python statements following the >>> prompt and hit enter to examine the  
result, instead of pushing F5 to run your code


--
Vriendelijke groeten / Kind regards,

Albert Visser

Using Opera's mail client: http://www.opera.com/mail/
--
https://mail.python.org/mailman/listinfo/python-list

Re: Where is inspect() located?

2014-11-16 Thread Albert Visser 

On Sun, 16 Nov 2014 05:12:36 +0100, Igor Korot  wrote:


import lib

Traceback (most recent call last):
  File "", line 1, in 
ImportError: No module named lib




In the https://docs.python.org/2/library/inspect.html, it says it is
located in Lib/inspect.py.

What am I missing? Or its only for 3.x?

Thank you.


Windows may not be case-sensitive, but Python is iirc

--
Vriendelijke groeten / Kind regards,

Albert Visser

--
https://mail.python.org/mailman/listinfo/python-list

Re: Tuples and immutability

2014-03-02 Thread albert visser 
On Sun, 02 Mar 2014 15:17:11 +0100, Eric Jacoboni  
 wrote:



Le 02/03/2014 15:05, Mark Lawrence a écrit :


The behaviour is consistent except when you try to modify a tuple.



Not in my opinion...

li = [10, 30]
li = li + "spam"   --> TypeError: can only concatenate list (not "str")
li += "spam"   --> Ok



possibly because you expect += to take "spam" as a string, but have you  
looked at the result?


In [1]: mylist = ['1', '2']

In [2]: mylist += 'spam'

In [3]: mylist
Out[3]: ['1', '2', 's', 'p', 'a', 'm']

consequently, try adding something that can not be interpreted as a  
sequence:


In [4]: mylist += 3
---
TypeError Traceback (most recent call last)
 in ()
> 1 mylist += 3

TypeError: 'int' object is not iterable


--
Vriendelijke groeten / Kind regards,

Albert Visser

Using Opera's mail client: http://www.opera.com/mail/
--
https://mail.python.org/mailman/listinfo/python-list

Re: trailing underscores naming convention_

2014-05-09 Thread Albert Visser 
On Fri, 09 May 2014 12:22:56 +0200, Metallicow   
wrote:



On Friday, May 9, 2014 3:10:26 AM UTC-6, Peter Otten wrote:

Metallicow wrote:

> I guess to be more clear here is a small code snippet that shows what  
is

> happening more readably. Hence the underscores question.

Working with multiple names with small differences is error-prone.


Definitely.



Anyway, the small snippet just shows that this can be done, but the  
actual
question you replied to you left unanswered. It is about the trailing  
underscores.




It's not an "official" convention I think, but a (single) trailing  
underscore is mainly meant to create something that is close to an  
original definition without shadowing it.
If you subclass an object and bind a thusly underscored method to an event  
to which the original is already bound in the superclass's __init__  
method, they are both getting called on the event unless you do not call  
the superclass's __init__() in your own __init__().


--
Vriendelijk groeten / Kind regards,

Albert Visser

Using Opera's mail client: http://www.opera.com/mail/
--
https://mail.python.org/mailman/listinfo/python-list

Re: semicolon at end of python's statements

2013-09-02 Thread albert visser 
On Mon, 02 Sep 2013 12:58:23 +0200, Antoon Pardon  
 wrote:



Op 02-09-13 12:42, Fábio Santos schreef:

On 09/02/2013 10:45 AM, Antoon Pardon wrote:

Op 02-09-13 10:05, Steven D'Aprano schreef:


[...]



for item in seq: if cond:
 do_this()
 do_that()
else:
 do_something else()

which is still nonsense but won't raise SyntaxError.

Why shouldn't this raise a SyntaxError?


Because it would be parsed as a valid for .. else construct. Either that
or become ambiguous to the programmer, who would not be sure whether he
was writing an else clause for the `if`, or for the `for`.




[...]


I also don't see how this would be that ambigous. The else
lines up with the for, so it seems rather obvious for which
he was writing an else clause.



My first association would be with the for, but someone could also be  
thinking it's referring to the if on the same line, because there wouldn't  
be any other way to write it (besides nesting the if).


I wouldn't like this syntax anyway, two colons and all.

When I first saw the idea of a nested for .. if construct the thing that  
came to mind was another nesting, namely that of context managers. While I  
don't mind using


with :
with :
do_stuff

I like being able to do e.g.

with open('some_file') as _in, open('another_file', 'w') as _out:

because it makes it obvious that the context managers are related.
Expressing that the for and the if are related also appeals to me.
Another parallel might be slicing, where you can specify not only a start  
and an end value, but also an interval (which could be seen as a kind of  
filtering condition).


I think that if you really want to show the "filtered for" as a somewhat  
different concept than a for that just happens to have an if in its suite,  
that should be made visible.

Coming back to my first association mentioned above, why not use a comma?

for  in , :


(come to think of it, it has the added bonus that you won't get ambiguity  
what an else might be about).



Somehow this makes sense to me. But then, I also like 'x = y if  
 else z'.

Moreover, I'm Dutch (...)

Albert Visser
--
Using Opera's mail client: http://www.opera.com/mail/
--
http://mail.python.org/mailman/listinfo/python-list

Re: Why doesn't input code return 'plants' as in 'Getting Started with Beautiful Soup' text (on page 30) ?

2015-07-12 Thread Albert Visser 
On Sun, 12 Jul 2015 19:33:17 +0200, Simon Evans  
 wrote:




Dear Peter Otten,
I typed in (and did not copy and paste) the code as you suggested just  
now (6.28 pm, Sunday 12th July 2015), this is the result I got:


Python 2.7.6 (default, Nov 10 2013, 19:24:18) [MSC v.1500 32 bit  
(Intel)] on win

32
Type "help", "copyright", "credits" or "license" for more information.

from bs4 import BeautifulSoup
with open("C:\Beautiful Soup\ecologicalpyramid.html","r")as f:

... soup = BeautifulSoup(f,"lxml")
  File "", line 2
soup = BeautifulSoup(f,"lxml")
   ^
IndentationError: expected an indented block

soup = BeautifulSoup(f,"lxml")

Traceback (most recent call last):
  File "", line 1, in 
NameError: name 'f' is not defined




The first time I typed in the second line, I got the
"Indentation error"
the second time I typed in exactly the same code, I got the:
"NameError:name 'f' is not defined"


"Expected an indented block" means that the indicated line should have  
started with at least one whitespace character more than the preceding  
line.


 >>> with open("C:\Beautiful Soup\ecologicalpyramid.html","r")as f:
 ... soup = BeautifulSoup(f,"lxml")

should have been something like

 >>> with open("C:\Beautiful Soup\ecologicalpyramid.html","r")as f:
 ... soup = BeautifulSoup(f,"lxml")
--
Vriendelijke groeten / Kind regards,

Albert Visser

Using Opera's mail client: http://www.opera.com/mail/
--
https://mail.python.org/mailman/listinfo/python-list

Re: Problem configuring apache to run python cgi on Ubuntu 14.04

2015-09-21 Thread Albert Visser 

On Mon, 21 Sep 2015 20:41:13 +0200,  wrote:


Hello everybody,


(...)


I created index.py:
#!/usr/bin/env python
# -*- coding: UTF-8 -*-# enable debugging
import cgitb

cgitb.enable()
print("Content-Type: text/html;charset=utf-8")
print("Hello World!")

But it is still not working.

Can anybody help me out?

Thanks in advance.


Which Python are you running? If it's Python 3, change the shebang  
accordingly because "python" is assuming Python 2.


--
Vriendelijke groeten / Kind regards,

Albert Visser

Using Opera's mail client: http://www.opera.com/mail/
--
https://mail.python.org/mailman/listinfo/python-list

Re: Sequencing images using tkinter?

2014-08-30 Thread Albert Visser 

On Sat, 30 Aug 2014 22:27:01 +0200,  wrote:

Although getting next_image to run for e.g. 10 times in a for loop is  
still something I can't get to work. It only displays one image.


I think this is because you do all your processing befoe starting the  
event loop (myGui.mainloop() ).


A better way is to bind the function that displays the images to a button  
callback.

Referring to your first post, that could be something like (untested)

def rotate():
for i in range(10):
myImage = PhotoImage(file="MonsterImages/Converted/" +  
random.choice(monsters))

myButton1.config(image=myImage, width="100", height="200")
sleep(0.2)

myButton1=Button(canvas1, text='OK', justify = LEFT, command=rotate)
myButton1.place(x=500,y=300)

myGui.mainloop()

Hope this helps
--
Vriendelijke groeten / Kind regards,

Albert Visser

Using Opera's mail client: http://www.opera.com/mail/
--
https://mail.python.org/mailman/listinfo/python-list