On 2019-06-02 02:28, jf...@ms4.hinet.net wrote:
Below is a simplified version of the sample script downloaded from its package.
When run it, the entry field display '0' instead of 'P&W'.
PS. I am using Python 3.4.4, Windows 32bit
----test0.py----
1 from tkinter import tix as Tix
2
3 root = Tix.Tk()
4
5 demo_maker = Tix.StringVar()
6 demo_maker.set('P&W')
7
8 c = Tix.Control(root, label='Engine Maker: ',
9 variable=demo_maker,
10 options='entry.width 10 label.width 20 label.anchor e')
11 c.pack(side=Tix.TOP, anchor=Tix.W)
12
13 root.mainloop()
--------
I run it under pdb, try to figure out where the problem is:
D:\Works\Python>py -m pdb test0.py
d:\works\python\test0.py(1)<module>()
-> from tkinter import tix as Tix
(Pdb) tbreak 13
Breakpoint 1 at d:\works\python\test0.py:13
(Pdb) cont
Deleted breakpoint 1 at d:\works\python\test0.py:13
d:\works\python\test0.py(13)<module>()
-> root.mainloop()
(Pdb) !c['value']
'0'
(Pdb) !demo_maker.get()
'P&W'
(Pdb) quit
If I change line 8 to "c = Tix.Control(root, label='Engine Maker: ',
value='P&W',", the result is very interest:
D:\Works\Python>py -m pdb test0.py
d:\works\python\test0.py(1)<module>()
-> from tkinter import tix as Tix
(Pdb) tbreak 13
Breakpoint 1 at d:\works\python\test0.py:13
(Pdb) cont
Deleted breakpoint 1 at d:\works\python\test0.py:13
d:\works\python\test0.py(13)<module>()
-> root.mainloop()
(Pdb) !c['value']
'0'
(Pdb) !demo_maker.get()
'0'
(Pdb) quit
Anyone can help?
From the documentation:
"""class tkinter.tix.Control
The Control widget is also known as the SpinBox widget. The user can
adjust the value by pressing the two arrow buttons or by entering the
value directly into the entry. The new value will be checked against the
user-defined upper and lower limits."""
In other words, the widget that you're using is for entering a _number_;
you can click the up and down buttons to change its value. You usually
use it with tix.IntVar.
You're using it with tix.StringVar, which is for strings, and because
it's unable to interpret the value as a number, it's pretending that
it's 0 instead. You can, however, set it to, say, '1', or '01', and the
widget will then show the number 1.
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