A problem with str VS int.
If I enter a one-digit input or a three-digit number, the code works but if I
enter a two digit number, the if statement fails and the else condition
prevails.
tsReading = input(" Enter the " + Brand + " test strip reading: ")
if tsReading == "": tsReading = "0"
print(tsReading)
if ((tsReading < "400") and (tsReading >= "0")):
tsDose = GetDose(sReading)
print(tsReading + "-" + tsDose)
ValueFailed = False
else:
print("Enter valid sensor test strip Reading.")
I converted the variable to int along with the if statement comparison and it
works as expected.
See if it fails for you...
Steve
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RE: A problem with str VS int.
With all these suggestions on
how to fix it, no one seems to
answer why it fails only when
entering a two-digit number.
One and three work fine when
comparing with str values. It
is interesting that the
leading 0 on a two digit
worked. Still, one digit and
three digit work but not two.
This is now more of a
curiosity as I did use the
integer comparisons.
SGA
-Original Message-
From: Python-list
On
Behalf Of dn via Python-list
Sent: Sunday, December 10,
2023 12:53 AM
To: python-list@python.org
Subject: Re: A problem with
str VS int.
On 10/12/23 15:42, Steve GS
via Python-list wrote:
> If I enter a one-digit
input or a three-digit number,
the code works but if I enter
a two digit number, the if
statement fails and the else
condition prevails.
>
> tsReading = input("
Enter the " + Brand + " test
strip reading: ")
> if tsReading == "":
tsReading = "0"
> print(tsReading)
> if ((tsReading <
"400") and (tsReading >=
"0")):
> tsDose =
GetDose(sReading)
> print(tsReading
+ "-" + tsDose)
> ValueFailed =
False
> else:
> print("Enter
valid sensor test strip
Reading.")
>
> I converted the variable to
int along with the if
statement comparison and it
works as expected.
> See if it fails for you...
It works as expected (by
Python)! This is how strings
are compared - which is not
the same as the
apparently-equivalent numeric
comparison.
Think about what you expect
from the code below, and then
take it for a spin (of mental
agility):
values = [ 333, 33, 3, 222,
22, 2, 111, 11, 1, ] print(
sorted( values ) ) strings = [
"333", "33", "3", "222", "22",
"2", "111", "11", "1", ]
print( sorted( strings ) )
The application's data appears
numeric (GetDose() decides!).
Accordingly, treat it so by
wrapping int() or float()
within a try-except (and
adjusting thereafter...).
"But wait, there's more!"
(assuming implement as-above):
if 0 <= ts_reading < 400:
1 consistent 'direction' of
the comparisons = readability
2 able to "chain" the
comparisons = convenience
3 identifier is
PEP-008-compliant = quality
and style
--
Regards,
=dn
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IDLE editor suggestion.
Maybe this already exists but I have never seen it in any editor that I have used. It would be nice to have a pull-down text box that lists all of the searches I have used during this session. It would make editing a lot easier if I could select the previous searches rather than having to enter it every time. If this is inappropriate to post this here, please tell me where to go. Life should be so complicated. -- https://mail.python.org/mailman/listinfo/python-list
RE: IDLE editor suggestion.
Does anything from the Visual Studio family of software have a pull down menu that lists previous searches so that I don’t have to enter them every time? SGA -Original Message- From: Friedrich Romstedt Sent: Tuesday, December 12, 2023 12:52 PM To: Steve GS Cc: python-list@python.org Subject: Re: IDLE editor suggestion. Hi! Am Di., 12. Dez. 2023 um 09:28 Uhr schrieb Steve GS via Python-list : > > Maybe this already exists but > I have never seen it in any > editor that I have used. You might want to choose Microsoft Code from its Visual Studio family of software, or, if you're ready for a deep dive, you might try using vim. Personally I am using both. HTH, Friedrich -- https://mail.python.org/mailman/listinfo/python-list
Problem resizing a window and button placement
Python, Tkinter: How do I determine if a window has been resized? I want to locate buttons vertically along the right border and need to know the new width. The buttons are to move with the change of location of the right-side border. SGA -- https://mail.python.org/mailman/listinfo/python-list
RE: Problem resizing a window and button placement
How do I extract the values
from args?
SGA
-Original Message-
From: Python-list
On
Behalf Of MRAB via Python-list
Sent: Friday, February 23,
2024 9:27 PM
To: python-list@python.org
Subject: Re: Problem resizing
a window and button placement
On 2024-02-24 01:14, Steve GS
via Python-list wrote:
> Python, Tkinter: How do I
> determine if a window has
been
> resized? I want to locate
> buttons vertically along the
> right border and need to
know
> the new width. The buttons
are
> to move with the change of
> location of the right-side
> border.
>
Bind an event handler for
'':
8<
import tkinter as tk
def on_configure(*args):
print(args)
root = tk.Tk()
root.bind('',
on_configure)
root.mainloop()
8<
Are you placing the buttons
yourself? I always use layouts
and they handle such things
automatically.
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RE: Problem resizing a window and button placement
Yes, I ran that elegantly simple code. The print statement reports the X, Y, Height and Width values. However, I do not see how to capture the width value. I experimented with the code Vwidth = rootV.winfo_width() and it also reports the width as I resize the window. However, I cannot seem to use the variable Vwidth outside the sub routine. It is acting as if Vwidth is not global but I added that. It is reported that Vwidth is not defined when I try to use it in my code. So close.. SGA -Original Message- From: Barry Sent: Saturday, February 24, 2024 3:04 AM To: Steve GS Cc: MRAB ; python-list@python.org Subject: Re: Problem resizing a window and button placement > On 24 Feb 2024, at 04:36, Steve GS via Python-list wrote: > > How do I extract the values > from args? You can look up the args in documentation. You can run the example code MRAB provided and see what is printed to learn what is in the args. Barry -- https://mail.python.org/mailman/listinfo/python-list
RE: Problem resizing a window and button placement
"Well, yes, in Python a variable created inside a function or method is local to that function unless you declare it global." Yes, I knew that. I tried to global it both before the function call and within it. Same for when I created the variable. If I try to use it in the rest of the code, it keeps coming up as not declared. In other functions, I can 'return' the variable but that apparently would not work for this function. Is this type of function any different that that which I have been using? SGA -Original Message- From: Python-list On Behalf Of Thomas Passin via Python-list Sent: Saturday, February 24, 2024 8:40 AM To: python-list@python.org Subject: Re: Problem resizing a window and button placement On 2/24/2024 3:20 AM, Steve GS via Python-list wrote: > Yes, I ran that elegantly > simple code. The print > statement reports the X, Y, > Height and Width values. > However, I do not see how to > capture the width value. > > I experimented with the code > Vwidth = rootV.winfo_width() > and it also reports the width > as I resize the window. > > However, I cannot seem to use > the variable Vwidth outside > the sub routine. It is acting > as if Vwidth is not global but > I added that. It is reported > that Vwidth is not defined > when I try to use it in my > code. Well, yes, in Python a variable created inside a function or method is local to that function unless you declare it global. That characteristic is called its "scope". But if you think you need it to be a global variable you should rethink your design. For one thing, before the next time you use your global variable the window size may have changed again. Instead, it would be better to have the function that responds to the resize event perform the action that you want, or call another function that does, passing the new width to it. Note that in most programming languages, variables have a scope. The rules about those scopes vary between languages. > > So close.. > SGA > > -Original Message- > From: Barry > > Sent: Saturday, February 24, > 2024 3:04 AM > To: Steve GS > > Cc: MRAB > ; > python-list@python.org > Subject: Re: Problem resizing > a window and button placement > > > >> On 24 Feb 2024, at 04:36, > Steve GS via Python-list > > wrote: >> >> How do I extract the values >> from args? > > You can look up the args in > documentation. > You can run the example code > MRAB provided and see what is > printed to learn what is in > the args. > > Barry > > -- https://mail.python.org/mailma n/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
RE: Problem resizing a window and button placement
import tkinter as tk
#global Ww Neither global
helps
def on_configure(*args):
# print(args)
#global Ww Neither
global helps
Ww = root.winfo_width()
print("WwInside = <" +
str(Ww) + ">")
root = tk.Tk()
root.bind('',
on_configure)
print("WwOutside = <" +
str(Ww) + ">")
#NameError: name 'Ww' is not
defined
root.mainloop()
SGA
-Original Message-
From: Python-list
On
Behalf Of MRAB via Python-list
Sent: Saturday, February 24,
2024 7:49 PM
To: python-list@python.org
Subject: Re: Problem resizing
a window and button placement
On 2024-02-25 00:33, Steve GS
via Python-list wrote:
> "Well, yes, in Python a
> variable created inside a
> function or method is local
to
> that function unless you
> declare it global."
>
> Yes, I knew that. I tried to
> global it both before the
> function call and within it.
> Same for when I created the
> variable. If I try to use it
> in the rest of the code, it
> keeps coming up as not
> declared. In other
functions,
> I can 'return' the variable
> but that apparently would
not
> work for this function.
>
> Is this type of function any
> different that that which I
> have been using?
>
Please post a short example
that shows the problem.
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RE: Problem resizing a window and button placement
The print statement in the
function prints.
Does that not mean that the
function is being called?
SGA
-Original Message-
From: Python-list
On
Behalf Of Thomas Passin via
Python-list
Sent: Saturday, February 24,
2024 10:39 PM
To: python-list@python.org
Subject: Re: Problem resizing
a window and button placement
On 2/24/2024 9:51 PM, Steve GS
via Python-list wrote:
First of all, please make sure
that the formatting is
readable and especially the
indentation. This is Python,
after all.
Do not use tabs; use 3 or 4
spaces instead of each tab.
> import tkinter as tk
>
> #global Ww Neither global
> helps
> def on_configure(*args):
> # print(args)
> #global Ww Neither
> global helps
> Ww =
root.winfo_width()
> print("WwInside = <" +
> str(Ww) + ">")
>
> root = tk.Tk()
> root.bind('',
> on_configure)
> print("WwOutside = <" +
> str(Ww) + ">")
> #NameError: name 'Ww' is not
> defined
The function that declares Ww
hasn't run yet. As I wrote
earlier, the function bound to
the callback should do all the
work for the callback, or it
should call other functions
that do. That's if you don't
let a layout do it all for
you, as others have written.
> root.mainloop()
>
> SGA
>
> -Original Message-
> From: Python-list
>
sga.ni...@python.org> On
> Behalf Of MRAB via
Python-list
> Sent: Saturday, February 24,
> 2024 7:49 PM
> To: python-list@python.org
> Subject: Re: Problem
resizing
> a window and button
placement
>
> On 2024-02-25 00:33, Steve
GS
> via Python-list wrote:
>> "Well, yes, in Python a
>> variable created inside a
>> function or method is local
> to
>> that function unless you
>> declare it global."
>>
>> Yes, I knew that. I tried
to
>> global it both before the
>> function call and within
it.
>> Same for when I created the
>> variable. If I try to use
it
>> in the rest of the code, it
>> keeps coming up as not
>> declared. In other
> functions,
>> I can 'return' the variable
>> but that apparently would
> not
>> work for this function.
>>
>> Is this type of function
any
>> different that that which I
>> have been using?
>>
> Please post a short example
> that shows the problem.
>
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RE: Problem resizing a window and button placement
So, how do I use the width value in my code?
SGA
-Original Message-
From: Python-list On Behalf
Of MRAB via Python-list
Sent: Saturday, February 24, 2024 10:36 PM
To: python-list@python.org
Subject: Re: Problem resizing a window and button placement
On 2024-02-25 02:51, Steve GS wrote:
> import tkinter as tk
>
> #global Ww Neither global helps
> def on_configure(*args):
> # print(args)
> #global Ww Neither global helps
> Ww = root.winfo_width()
> print("WwInside = <" + str(Ww) + ">")
>
> root = tk.Tk()
> root.bind('', on_configure) print("WwOutside = <" + str(Ww)
> + ">")
> #NameError: name 'Ww' is not defined
> root.mainloop()
'Ww' won't exist until 'on_configure' assigns to it, and that won't happen
until `mainloop` starts.
Also, 'global' works only within a function.
8<
import tkinter as tk
def on_configure(event):
print(f'{event.width=}, {event.height=}')
root = tk.Tk()
root.bind('',on_configure)
root.mainloop()
8<
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RE: RE: Problem resizing a window and button placement
SOLUTION FOUND!
The fix was to write the code that uses the width value and to place it into
the function itself.
Kluge? Maybe but it works.
Mischief Managed.
As for the most recent suggestion, it fails for me:
Traceback (most recent call last):
File "F:/___zInsulin Code A 08-02-23/WinPic/IOWw.pyw", line 14, in
print("Ww Outside = <" + str(Ww) > + ">")
TypeError: bad operand type for unary +: 'str'
With the need to close the window, it adds an extra step and intervention to
the program to use. I am not sure how this help[s.
As a curio, it would be interesting to see how to use the value of a variable,
created in the function used here, and make it available to the code outside
the function.
SGA
-Original Message-
From: Alan Gauld
Sent: Sunday, February 25, 2024 12:44 PM
To: Steve GS ; python-list@python.org
Subject: Re: RE: Problem resizing a window and button placement
On 25/02/2024 03:58, Steve GS via Python-list wrote:
import tkinter as tk
Ww = None
def on_configure(*args):
global Ww
Ww = root.winfo_width()
print("Ww Inside = <" + str(Ww) + ">")
root = tk.Tk()
root.bind('', on_configure)
root.mainloop()
print("Ww Outside = <" + str(Ww) > + ">")
Produces:
Ww Inside = <200>
Ww Inside = <200>
Ww Inside = <205>
Ww Inside = <205>
Ww Inside = <206>
Ww Inside = <206>
Ww Outside = <206>
HTH
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos
--
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RE: Problem resizing a window and button placement
Ww Inside = <250>
Ww Inside = <249>
Ww Inside = <250>
Ww Outside =
<1770662408256on_configure>
Here is my result...
SGA
-Original Message-
From: Python-list
On
Behalf Of MRAB via Python-list
Sent: Sunday, February 25,
2024 6:40 PM
To: python-list@python.org
Subject: Re: Problem resizing
a window and button placement
On 2024-02-25 21:19, Steve GS
via Python-list wrote:
> SOLUTION FOUND!
>
> The fix was to write the
code that uses the width value
and to place it into the
function itself.
> Kluge? Maybe but it works.
>
> Mischief Managed.
>
>
> As for the most recent
suggestion, it fails for me:
>
> Traceback (most recent call
last):
>File "F:/___zInsulin Code
A 08-02-23/WinPic/IOWw.pyw",
line 14, in
> print("Ww Outside = <"
+ str(Ww) > + ">")
> TypeError: bad operand type
for unary +: 'str'
>
It fails because there's a
mistake. It should be:
print("Ww Outside = <" +
str(Ww) + ">")
> With the need to close the
window, it adds an extra step
and intervention to the
program to use. I am not sure
how this help[s.
>
> As a curio, it would be
interesting to see how to use
the value of a variable,
created in the function used
here, and make it available to
the code outside the function.
>
[snip]
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RE: Problem resizing a window and button placement
Musta misstit
I had thought of that before I
started the discussion but
figured it would take more
code than it finally needed.
I guess I was also
variable-dependent thinking
that I would need the result
elsewhere in the code. So
far, I see that I don't need
the value.
Then there is that discovery
element: Why is my original
idea not working? I still
cannot pass the value back
from the function. What is
different about this function
that others would have given
me the value?
SGA
-Original Message-
From: Python-list
On
Behalf Of Thomas Passin via
Python-list
Sent: Sunday, February 25,
2024 5:55 PM
To: python-list@python.org
Subject: Re: Problem resizing
a window and button placement
On 2/25/2024 4:19 PM, Steve GS
via Python-list wrote:
> SOLUTION FOUND!
>
> The fix was to write the
code that uses the width value
and to place it into the
function itself.
> Kluge? Maybe but it works.
Right, just what I wrote
earlier:
"have the function that
responds to the resize event
perform the action that you
want"
> Mischief Managed.
>
>
> As for the most recent
suggestion, it fails for me:
>
> Traceback (most recent call
last):
>File "F:/___zInsulin Code
A 08-02-23/WinPic/IOWw.pyw",
line 14, in
> print("Ww Outside = <"
+ str(Ww) > + ">")
> TypeError: bad operand type
for unary +: 'str'
>
> With the need to close the
window, it adds an extra step
and intervention to the
program to use. I am not sure
how this help[s.
>
> As a curio, it would be
interesting to see how to use
the value of a variable,
created in the function used
here, and make it available to
the code outside the function.
>
>
>
> SGA
>
> -Original Message-
> From: Alan Gauld
> Sent: Sunday, February 25,
2024 12:44 PM
> To: Steve GS
;
python-list@python.org
> Subject: Re: RE: Problem
resizing a window and button
placement
>
> On 25/02/2024 03:58, Steve
GS via Python-list wrote:
> import tkinter as tk
>
> Ww = None
>
> def on_configure(*args):
> global Ww
> Ww =
root.winfo_width()
> print("Ww Inside =
<" + str(Ww) + ">")
>
> root = tk.Tk()
> root.bind('',
on_configure)
> root.mainloop()
>
> print("Ww Outside = <" +
str(Ww) > + ">")
>
> Produces:
> Ww Inside = <200>
> Ww Inside = <200>
> Ww Inside = <205>
> Ww Inside = <205>
> Ww Inside = <206>
> Ww Inside = <206>
> Ww Outside = <206>
>
> HTH
>
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RE: RE: Problem resizing a window and button placement
Although your code produces the value of Ww outside the function, I do not see
how I can use the value of Ww unless I close the program.
import tkinter as tk
Ww = None # What does this do? Why not Integer?
WwZ = None
def on_configure(*args):
global Ww
global WwZ
Ww = root.winfo_width()
print("9 Ww Inside =<"+str(Ww)+">") # works
WwZ = Ww * 2
print("11 WwZ Inside =<"+str(WwZ)+">") # works
return(Ww) #Can I use this?
root = tk.Tk()
root.bind('',on_configure)
print("15 Ww Inside1 = <"+str(Ww)+">")
#Ww2 = int(Ww) * 2 # fails
print("17 WwZ Inside2 = <"+str(WwZ)+">")
root.mainloop()
Ww2 = int(Ww) * 2 #Works but only after the program stops
print("21 Ww Outside2 = <"+str(WwZ)+">")
# Can I have concentric loops?
SGA
-Original Message-
From: Alan Gauld
Sent: Monday, February 26, 2024 4:04 AM
To: Steve GS ; python-list@python.org
Subject: Re: RE: Problem resizing a window and button placement
On 26/02/2024 07:56, Steve GS via Python-list wrote:
> Then there is that discovery
> element: Why is my original
> idea not working? I still
> cannot pass the value back
> from the function. What is
> different about this function
> that others would have given
> me the value?
There is nothing different, see the code below.
print() is a function like any other.
In this case it is called after you close the window, ie after mainloop() exits.
But any other function called inside
mainloop - eg any other event handler can also access it.
For example, if you added a button:
def printW(): print("Button Ww = ", Ww)
bw = tk.Button(root, text="Print Width", command=printW)
bw.pack()
You would be able to print the value on demand.
>> import tkinter as tk
>>
>> Ww = None
>>
>> def on_configure(*args):
>> global Ww
>> Ww = root.winfo_width()
>> print("Ww Inside =<"+str(Ww)+">")
>>
>> root = tk.Tk()
>> root.bind('',on_configure)
>> root.mainloop()
>>
>> print("Ww Outside = <"+str(Ww)+">")
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos
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RE: Problem resizing a window and button placement
>> The configuration event
hasn't fired at the time you
include the print statement in
the handler's def block, and
therefore the print function
inside your handler hasn't
invoked. It won't be invoked
until you resize the window.
Exactly
>> There is no point (really?)
to saving the width and height
outside your
on_configure() function,
because outside that function
you can't know if they have
been changed. There could
even have been a race
condition where you use one
but the other changes before
you get around to using it.
Aside from using it to resized
the window, is there no way to
know the last value of the
change for use in the program?
I could write the value to a
label and read it back later
in the process but that sounds
to be klugy.
>> It's better just to ask tk
for the values whenever you
need them, as you do inside
your handler.
How would that be done?
SGA
-Original Message-
From: Python-list
On
Behalf Of Thomas Passin via
Python-list
Sent: Monday, February 26,
2024 8:34 AM
To: python-list@python.org
Subject: Re: Problem resizing
a window and button placement
On 2/26/2024 6:02 AM, Steve GS
via Python-list wrote:
> Although your code produces
the value of Ww outside the
function, I do not see how I
can use the value of Ww unless
I close the program.
The configuration event hasn't
fired at the time you include
the print statement in the
handler's def block, and
therefore the print function
inside your handler hasn't
invoked. It won't be invoked
until you resize the window.
There is no point to saving
the width and height outside
your
on_configure() function,
because outside that function
you can't know if they have
been changed. There could
even have been a race
condition where you use one
but the other changes before
you get around to using it.
It's better just to ask tk for
the values whenever you need
them, as you do inside your
handler.
> import tkinter as tk
>
> Ww = None # What does this
do? Why not Integer?
> WwZ = None
# These could be integers,
like 0, but that would not be
the correct # window sizes at
that point. The window is
either not constructed or it #
has some definite size that is
not zero.
> def on_configure(*args):
> global Ww
> global WwZ
> Ww =
root.winfo_width()
> print("9 Ww Inside
=<"+str(Ww)+">") # works
> WwZ = Ww * 2
> print("11 WwZ
Inside =<"+str(WwZ)+">") #
works
> return(Ww) #Can I
use this?
>
> root = tk.Tk()
>
root.bind('',on_con
figure)
> print("15 Ww Inside1 =
<"+str(Ww)+">")
> #Ww2 = int(Ww) * 2 # fails
> print("17 WwZ Inside2 =
<"+str(WwZ)+">")
>
> root.mainloop()
>
> Ww2 = int(Ww) * 2 #Works
but only after the program
stops
> print("21 Ww Outside2 =
<"+str(WwZ)+">") # Can I have
concentric
> loops?
>
>
> SGA
>
> -Original Message-
> From: Alan Gauld
> Sent: Monday, February 26,
2024 4:04 AM
> To: Steve GS
;
python-list@python.org
> Subject: Re: RE: Problem
resizing a window and button
placement
>
> On 26/02/2024 07:56, Steve
GS via Python-list wrote:
>
>> Then there is that
discovery
>> element: Why is my original
>> idea not working? I still
>> cannot pass the value back
>> from the function. What is
>> different about this
function
>> that others would have
given
>> me the value?
>
> There is nothing different,
see the code below.
> print() is a function like
any other.
> In this case it is called
after you close the window, ie
after mainloop() exits.
> But any other function
called inside
> mainloop - eg any other
event handler can also access
it.
>
> For example, if you added a
button:
>
> def printW(): print("Button
Ww = ", Ww)
>
> bw = tk.Button(root,
text="Print Width",
command=printW)
> bw.pack()
>
> You would be able to print
the value on demand.
>
>>> import tkinter as tk
>>>
>>> Ww = None
>>>
>>> def on_configure(*args):
>>> global Ww
>>> Ww =
root.winfo_width()
>>> print("Ww Inside
=<"+str(Ww)+">")
>>>
>>> root = tk.Tk()
>>>
root.bind('',on_con
figure)
>>> root.mainloop()
>>>
>>> print("Ww Outside =
<"+str(Ww)+">")
>
> --
> Alan G
> Author of the Learn to
Program web site
http://www.alan-g.me.uk/
>
http://www.amazon.com/author/a
lan_gauld
> Follow my photo-blog on
Flickr at:
>
http://www.flickr.com/photos/a
langauldphotos
>
>
--
https://mail.python.org/mailma
n/listinfo/python-list
--
https://mail.python.org/mailman/listinfo/python-list
Transparent label background?
My window is to have a label over an image. How do I place a label that has a transparent background so as to not have the square of the label look so obnoxious? SGA -- https://mail.python.org/mailman/listinfo/python-list
