Python 3.8.5

2021-01-06 Thread Joseph Milroy Felix Moraes (Moraes) via Python-list
Good day,

I keep getting this error message when trying to open Python 3.8.5 on my 
computer windows 7 , 64 bit.

---
python.exe - System Error
---
The program can't start because api-ms-win-crt-runtime-l1-1-0.dll is missing 
from your computer. Try reinstalling the program to fix this problem.
---
OK 
---

kindly assist

Regards,
Milroy

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Re: Python 3.8.5

2021-01-06 Thread Grant Edwards
On 2021-01-06, Joseph Milroy Felix Moraes (Moraes) via Python-list 
 wrote:
> Good day,
>
> I keep getting this error message when trying to open Python 3.8.5 on my 
> computer windows 7 , 64 bit.
>
> ---
> python.exe - System Error
> ---
> The program can't start because api-ms-win-crt-runtime-l1-1-0.dll is missing 
> from your computer. Try reinstalling the program to fix this problem.
> ---
> OK 
> ---
>
> kindly assist

https://www.google.com/search?q=api-ms-win-crt-runtime-l1-1-0.dll+is+missing

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Tkinter menu item underline syntax

2021-01-06 Thread Rich Shepard

My application's menu has lines like this:
file_menu.add_command(
label = 'New',
command = self.callbacks['file->new', underline 0],
accelerator = 'Ctrl+N'
)

Python reports a syntax error when specifying the string index to underline;
it rejects both a space and an equals sign (=).

In "Modern Tkinter", page 88, the author explains,
"Underline
"While all platforms support keyboard traversal of the menubar via the arrow
keys, on Windows and X11, you can also use other keys to jump to particular
menus or menu items. The keys that trigger these jumps are indicated by an
underlined letter in the menu item’s label. If you want to add one of these
to a menu item, you can use the "underline" configuration option for the
item. The value of this option should be the index of the character you’d like
underlined (from 0 to the length of the string - 1)."

There is no example of the proper syntax and my web searches haven't found
one, either.

How do I pass a string index to the command to underline that character?

TIA,

Rich
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Re: Tkinter menu item underline syntax

2021-01-06 Thread 2QdxY4RzWzUUiLuE
On 2021-01-06 at 10:32:58 -0800,
Rich Shepard  wrote:

> My application's menu has lines like this:
> file_menu.add_command(
> label = 'New',
> command = self.callbacks['file->new', underline 0],
> accelerator = 'Ctrl+N'
> )
> 
> Python reports a syntax error when specifying the string index to underline;
> it rejects both a space and an equals sign (=).

I'm not a TKinter expert (nor even a current user), but that line that
begins with whitespace and "command =" looks suspicious.  As far as I
can see, Python is correct to call it syntactically erroneous.

What is self.callbacks?  Is it a function, a list of functions, a list
of something else?

Did you possibly mean to use parentheses "(" and ")" instead of brackets
"[" and "]"?  Or perhaps some different punctuation between the "[" and
the "]"?

>From what I remember about TKinter, embedding Tcl/TK code inside strings
inside Python can be tricky (to say the least).

Sorry I don't have a concrete solution, just more to think about.
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Re: Tkinter menu item underline syntax [RESOLVED]

2021-01-06 Thread Rich Shepard

On Wed, 6 Jan 2021, 2qdxy4rzwzuui...@potatochowder.com wrote:


I'm not a TKinter expert (nor even a current user), but that line that
begins with whitespace and "command =" looks suspicious. As far as I can
see, Python is correct to call it syntactically erroneous.


Yes, the line above it needed to be terminated by a comma, not \n.

I found the answer: underline is an option and options are key: value pairs.
So, the correct syntax is underline: 0.

Thanks,

Rich
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Re: Tkinter menu item underline syntax [RESOLVED]

2021-01-06 Thread 2QdxY4RzWzUUiLuE
On 2021-01-06 at 11:18:15 -0800,
Rich Shepard  wrote:

> On Wed, 6 Jan 2021, 2qdxy4rzwzuui...@potatochowder.com wrote:
> 
> > I'm not a TKinter expert (nor even a current user), but that line that
> > begins with whitespace and "command =" looks suspicious. As far as I can
> > see, Python is correct to call it syntactically erroneous.
> 
> Yes, the line above it needed to be terminated by a comma, not \n.
> 
> I found the answer: underline is an option and options are key: value pairs.
> So, the correct syntax is underline: 0.

Glad you found it.  :-)

For the sake of future generations who may run into this issue, can you
post the complete, correct call to file_menu.add_command?
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Re: Tkinter menu item underline syntax

2021-01-06 Thread Terry Reedy

On 1/6/2021 1:32 PM, Rich Shepard wrote:

My application's menu has lines like this:
     file_menu.add_command(
     label = 'New',
     command = self.callbacks['file->new', underline 0],
     accelerator = 'Ctrl+N'
     )


'underline' has nothing to do with looking up the command in 
self.callbacks.  It is a keyword parameter for the add_command method, 
and is handled like all other values passed by name, and as you did for 
the other arguments


  file_menu.add_command(
  label='New',
  underline=0,
  command=self.callbacks['file->new],
  accelerator='Ctrl+N'
  )

Note: PEP 8 style is no spaces around '=' used for keyword  arguments. 
Here is an example from idlelib.editor, 978.


menu.add_command(label=ulchars[i] + " " + file_name,
 command=callback,
 underline=0)


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Re: Tkinter menu item underline syntax [RESOLVED]

2021-01-06 Thread Rich Shepard

On Wed, 6 Jan 2021, 2qdxy4rzwzuui...@potatochowder.com wrote:


For the sake of future generations who may run into this issue, can you
post the complete, correct call to file_menu.add_command?


This is the working version of the stanza I initially posted:

file_menu.add_command(
label = 'New',
command = self.callbacks['file->new', underline: 0],
accelerator = 'Ctrl+N'
)

The label line separated from the command with a comma. The underline option
is a key and separated from its value with a colon.

HTH,

Rich
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Re: Tkinter menu item underline syntax [RESOLVED]

2021-01-06 Thread Chris Angelico
On Thu, Jan 7, 2021 at 7:43 AM Rich Shepard  wrote:
> This is the working version of the stanza I initially posted:
>
> file_menu.add_command(
>  label = 'New',
>  command = self.callbacks['file->new', underline: 0],
>  accelerator = 'Ctrl+N'
>  )
>
> The label line separated from the command with a comma. The underline option
> is a key and separated from its value with a colon.
>

Are you sure that this works? It's syntactically valid, but I don't
think it means what you think it does.

ChrisA
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Re: Tkinter menu item underline syntax [RESOLVED]

2021-01-06 Thread Rich Shepard

On Thu, 7 Jan 2021, Chris Angelico wrote:


Are you sure that this works? It's syntactically valid, but I don't
think it means what you think it does.


ChrisA,

I'm always open to learning. There's no error generated ... yet the
application doesn' open so it's time to run it through pdb.

Regards,

Rich
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Re: Tkinter menu item underline syntax [RESOLVED]

2021-01-06 Thread Chris Angelico
On Thu, Jan 7, 2021 at 8:04 AM Rich Shepard  wrote:
>
> On Thu, 7 Jan 2021, Chris Angelico wrote:
>
> > Are you sure that this works? It's syntactically valid, but I don't
> > think it means what you think it does.
>
> ChrisA,
>
> I'm always open to learning. There's no error generated ... yet the
> application doesn' open so it's time to run it through pdb.
>

Cool. Terry had something on the subject in the other thread; I think
that's a good place to start. (I don't know much about Tkinter, this
line of code just looked odd in general Python syntax.)

ChrisA
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Re: Tkinter menu item underline syntax [RESOLVED]

2021-01-06 Thread Rich Shepard

On Thu, 7 Jan 2021, Chris Angelico wrote:


Cool. Terry had something on the subject in the other thread; I think
that's a good place to start. (I don't know much about Tkinter, this line
of code just looked odd in general Python syntax.)


ChrisA,

It's been a long time since I wrote any Python code. Assignments have spaces
surrounding equal signs while values to options don't. I think I have the
code cleaned now.

Regards,

Rich
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Re: Tkinter menu item underline syntax [RESOLVED]

2021-01-06 Thread Grant Edwards
On 2021-01-06, Rich Shepard  wrote:
> On Wed, 6 Jan 2021, 2qdxy4rzwzuui...@potatochowder.com wrote:
>
>> For the sake of future generations who may run into this issue, can you
>> post the complete, correct call to file_menu.add_command?
>
> This is the working version of the stanza I initially posted:
>
>   file_menu.add_command(
>  label = 'New',
>  command = self.callbacks['file->new', underline: 0],
>  accelerator = 'Ctrl+N'
>  )

I'm completely baffled by that. Can somebody explain how this
expression is evaluated?

   self.callbacks['file->new', underline: 0]

It appears that the dict callbacks is being accessed with the key of 
a tuple comprising a string and a slice.

Huh?

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Re: Tkinter menu item underline syntax [RESOLVED]

2021-01-06 Thread Terry Reedy

On 1/6/2021 4:03 PM, Rich Shepard wrote:

On Thu, 7 Jan 2021, Chris Angelico wrote:


Are you sure that this works? It's syntactically valid, but I don't
think it means what you think it does.


ChrisA,

I'm always open to learning. There's no error generated ... yet the
application doesn' open so it's time to run it through pdb.


See my response, sent an hour ago, for how to use 'underline.


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Re: Tkinter menu item underline syntax [RESOLVED]

2021-01-06 Thread Chris Angelico
On Thu, Jan 7, 2021 at 9:22 AM Grant Edwards  wrote:
>
> On 2021-01-06, Rich Shepard  wrote:
> > On Wed, 6 Jan 2021, 2qdxy4rzwzuui...@potatochowder.com wrote:
> >
> >> For the sake of future generations who may run into this issue, can you
> >> post the complete, correct call to file_menu.add_command?
> >
> > This is the working version of the stanza I initially posted:
> >
> >   file_menu.add_command(
> >  label = 'New',
> >  command = self.callbacks['file->new', underline: 0],
> >  accelerator = 'Ctrl+N'
> >  )
>
> I'm completely baffled by that. Can somebody explain how this
> expression is evaluated?
>
>self.callbacks['file->new', underline: 0]
>
> It appears that the dict callbacks is being accessed with the key of
> a tuple comprising a string and a slice.
>

Heh, you had to try it to make sure it was valid? Me too. Here's how
it's parsed:

self.callbacks[ # this bit's non-controversial
'file->new' # string literal
, # make tuple
underline: 0 # slice(underline, 0, None)
]

So it takes the name "underline", whatever that is, and it assumes you
want a slice from underline to zero. That's all the second dimension
of the indexing, where the first is a simple string literal.

ChrisA
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Class and tkinter problem

2021-01-06 Thread Paulo da Silva
Hi!

Does anybody know why cmd method isn't called when I change the button
state (clicking on it) in this example?
I know that this seems a weird class use. But why doesn't it work?
Thanks.

class C:
from tkinter import Checkbutton
import tkinter

@staticmethod
def cmd():
print("Test")

top=tkinter.Tk()
cb=Checkbutton(command=cmd)
cb.pack()

@staticmethod
def loop():
C.top.mainloop()

c=C()
c.loop()
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Re: Class and tkinter problem

2021-01-06 Thread Christian Gollwitzer

Am 07.01.21 um 08:29 schrieb Paulo da Silva:


Does anybody know why cmd method isn't called when I change the button
state (clicking on it) in this example?
I know that this seems a weird class use. But why doesn't it work?
Thanks.

class C:
 from tkinter import Checkbutton
 import tkinter

 @staticmethod

^^it works if you remove the staticmethod here


 def cmd():
 print("Test")



Maybe there is a bug in tkinter, that it doesn't work with static methods?

Christian
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