[Solved] Learn Python Programming

[jsvenancio]

Good evening.

How do I install correctly with Python Tkinter?
I'm using Geany to learn to program in Python, I'm trying to start work the following code:

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from Tkinter import *

def Cumprimente():
	hello.set("Hello World")

gui = tk()

gui.title("Python3 + tkinter")
gui.geometry("400x300")

btn = Button(gui, text="Cumprimente", Command=Cumprimente)
btn.pack()

hello = StringVar()
lbl = Label(gui, TextVariable=hello)
lbl.pack()

gui.mainloop()

But whenever I try to run the code I get this error:

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Traceback (most recent call last):
  File "Hello World.py", line 7, in <module>
    gui = tk()
NameError: name 'tk' is not defined


------------------
(program exited with code: 1)
Press return to continue

I think the problem is related to the Tkinter.
How can I solve this?

[wildman]

Make sure these packages are installed:

python
python-tk
python-pmw
python-imaging
idle
tk
tcl

[jsvenancio]

tk

The tk package, I can not find it in the manager SolydX programs.

[wildman]

The tk package, I can not find it in the manager SolydX programs.

That is odd. I am using SolydX and tk was installed by default. Here is a screen shot of Synaptic:
https://www.dropbox.com/s/gpl2i14yrk7re ... c.png?dl=0

What do you get if you enter this into a terminal?

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apt policy tk

[Deleted User 2764]

Same here on a SolydK system:

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ravenlx@solydk-hp ~ $ apt policy tk
tk:
  Installed: 8.6.0+8
  Candidate: 8.6.0+8
  Version table:
 *** 8.6.0+8 0
        500 http://debian.solydxk.com/production/ testing/main amd64 Packages
        100 /var/lib/dpkg/status

It should already be installed.

[jsvenancio]

What do you get if you enter this into a terminal?

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apt policy tk

It appears that is already installed.

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$ apt policy tk
tk:
  Instalado: 8.6.0+8
  Candidato: 8.6.0+8
  Tabela de Versão:
 *** 8.6.0+8 0
        500 http://debian.solydxk.com/production/ testing/main i386 Packages
        100 /var/lib/dpkg/status
$ 

But whenever I try to run the code I get this error:

Code: Select all

Traceback (most recent call last):
  File "Hello World.py", line 7, in <module>
    gui = tk()
NameError: name 'tk' is not defined


------------------
(program exited with code: 1)
Press return to continue

[Deleted User 2764]

First, you need to:

Code: Select all

sudo apt-get install python-tk

In your code, use:

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from Tkinter import *

and

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gui = Tk()

with an upper case T.

It may not work either. Try reading this (it's in English so you'll need to translate it):

https://wiki.python.org/moin/TkInter

Also after I did the above changes, I got this:

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Traceback (most recent call last):
  File "./HelloWorld.py", line 13, in <module>
    btn = Button(gui, text="Cumprimente", Command=Cumprimente)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 2128, in __init__
    Widget.__init__(self, master, 'button', cnf, kw)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 2058, in __init__
    (widgetName, self._w) + extra + self._options(cnf))
_tkinter.TclError: unknown option "-Command"

Which you'll need to fix yourself. It seems maybe the command or main isn't working? I don't know python enough to know exactly what is going on though.

Note that I do not use spaces in the filename. I don't find it's a good idea to put spaces in filenames as it can sometimes make it harder to execute in Linux (ie. need to use a \ before a space in the command line, for example).

[Deleted User 2764]

Ok, after doing the installing of python-tk, try this code:

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from Tkinter import *

def Pressed():                          #function
        print 'buttons are cool'

root = Tk()                             #main window
button = Button(root, text = 'Press', command = Pressed)
button.pack(pady=20, padx = 20)
Pressed()
root.mainloop()

It should work fine. It may too be that your code may have some bugs in it. Remember, python is also very case sensitive.

Here's where I got the above code from: https://wiki.python.org/moin/Intro%20to ... %20Tkinter

It might be a nice tutorial for those learning Python/Tk.

[Deleted User 2764]

I have debugged your original code. Try this:

Code: Select all

#!/usr/bin/env python

from Tkinter import *

def Cumprimente():
   hello.set("Hello World")

gui = Tk()

gui.title("Python3 + tkinter")
gui.geometry("400x300")

btn = Button(gui, text="Cumprimente", command=Cumprimente)
btn.pack()

hello = StringVar()
lbl = Label(gui, textvariable=hello)
lbl.pack()

gui.mainloop()

I changed "Tkinter, Tk, and also "Command" needed to be "command" as well as "TextVariable" needed to be "textvariable".

Worked on my system after installing "python-tk". Hope this helps!

[jsvenancio]

I have debugged your original code. Try this:

Code: Select all

#!/usr/bin/env python

from Tkinter import *

def Cumprimente():
   hello.set("Hello World")

gui = Tk()

gui.title("Python3 + tkinter")
gui.geometry("400x300")

btn = Button(gui, text="Cumprimente", command=Cumprimente)
btn.pack()

hello = StringVar()
lbl = Label(gui, textvariable=hello)
lbl.pack()

gui.mainloop()

I changed "Tkinter, Tk, and also "Command" needed to be "command" as well as "TextVariable" needed to be "textvariable".

Thanks for your help.
This code works, the error was mine, wrote with capital letter when he should write with lowercase letter.

I will also analyze the tutorials you mentioned.

[liam10]

Please follow this procedure:
Install Python. According to python.org, ...
Install Tkinter. To see if you have Tkinter, launch python; then at the Python prompt, type >>> import Tkinter. ...




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