I'm looking at some Tk code written by someone else, and am curious about a
methodology in the code. A setup object called SetDlg contains to code to
set up parameters for some widgets for a dialog of radio buttons,
checkboxes, and text/string entries. It then calls ShowDlg. After it returns
in resets any new values entered for parameters. It's return is entry, which
is of class Entry. The curious code is in ShowDlg. It looks like
Radiboutton(master, textvariable = ...
Radiobutton(msster, textvariable = ...
Checkbox(master, text=...
entry = Entry(master, width=10, ...
entry.insert(0,self.slowdown) # testing a default methodology
Label( master, text="Max...
Entry(master, width=10, textvar...
...
return entry
First, what is the meaning of entry=Entry(...? That is, other than create an
Entry, why that particular position, and why not with say Checkbox? Further,
SetDlg has used ShowDlg by calling dialog=ShowDlg(( self.master, set_a...
dialog is then used to get at the parameters set by the user. I thought I'd
give ShowDlg an attribute by using entry.insert(0,self.slowdown inserting it
before return. Upon return from ShowDlg, which was invoked by, dialog =
ShowDlg( self.master, set_a ..., I thought I'd grab slowdown with x=
dialog.slowdown. The program didn't get that far, so, second, I'd like to
know why it died on the insert statement? That line, produced 'NoneType'
object has no attribute 'insert' , and entry and its type are None and >type
'NoneType'> What has gone wrong?
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