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Python cluelessness with lists

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John_OR
Occasional Contributor

Python cluelessness with lists

Hi, I'm trying to transition from VBScript to Python and having some trouble understanding lists in Python.  What I'm trying to do is find all the comboboxes in a dialog and add them to a list.  Once they are in the list I iterate through the list setting the indexes of the comboboxes.  Unfortunately it's not working. 

 

Here is a simplified version of the code omitting the iteration through the list with a 'for' statement:

 

dlg = some_dialog

combos = [(dlg.FindAllChildren(QtClassName,"OnOneComboBox",7))]

combos[0].QComboBox_setCurrentIndex(1)

 

When I run the code I get this error:

AttributeError: 'SafeArrayWrapper' object has no attribute 'QComboBox_setCurrentIndex'

 

What is this "SafeArrayWrapper" business? 

 

Many thanks, John

1 ACCEPTED SOLUTION

Accepted Solutions
John_OR
Occasional Contributor

Re: Python cluelessness with lists

It looks like I figured it out.  I changed :

combos = [(dlg.FindAllChildren(QtClassName,"OnOneComboBox",7))]

 

to

 

combos = list(dlg.FindAllChildren(QtClassName,"OnOneComboBox",7))

 

Removing the brackets per your suggestion and adding "list" did the trick.  Now setting the index is working and I'm able to append to the list.

 

 

 

View solution in original post

9 REPLIES 9
NisHera
Valued Contributor

Re: Python cluelessness with lists

You said you are creating a list ...

So what do you suppose to do with combos[0].QComboBox_setCurrentIndex(1) ?

what the message saying is there is no attribute call "QComboBox_setCurrentIndex(1)" in lists class/object

 

what index are you going to set?   

 

for Iterate you can use combos[i] in for loop which iterate from 0 to len(combos)

 

to understand python lists read this and this

 

 

John_OR
Occasional Contributor

Re: Python cluelessness with lists

Hi, thanks for the reply.  I'm expecting combos[0] to return the combobox object at index zero in the combos list.  Provided that happens QComboBox_setCurrentIndex(1) will select the second item in the combobox.  

 

The problem is I'm not getting an object back with combos[0].  Instead of the combobox object I'm getting a "SafeArrayWrapper".  If I don't get the combobox back then QComboBox_setCurrentIndex(1) will obviously fail.

 

Also, I can't find any information in Python documentation regarding a "SafeArrayWrapper" object.  My assumption is SafeArrayWrapper is a SmartBear/TestComplete construct that doesn't exist natively in Python.  I could be wrong about that though.

 

 

baxatob
Community Hero

Re: Python cluelessness with lists

Hi,

 

Try to remove square brackets from your statement:

 

combos = dlg.FindAllChildren(QtClassName,"OnOneComboBox",7)

Otherwise you will receive array in array, something like:

 

[[obj1, obj2, obj3]]
John_OR
Occasional Contributor

Re: Python cluelessness with lists

Hi, thanks for the tip.  Removing the brackets works but later when I want to append to the combos list/array it's not working.  Following on from my example I tried something like this:

combos.append (some_other_combo_here)

 

That gives me the familiar error:  "AttributeError" 'SafeArrayWrapper' object has no attribute 'append'.

 

Any idea how I can successfully append to combos?

 

Thanks,

John

John_OR
Occasional Contributor

Re: Python cluelessness with lists

It looks like I figured it out.  I changed :

combos = [(dlg.FindAllChildren(QtClassName,"OnOneComboBox",7))]

 

to

 

combos = list(dlg.FindAllChildren(QtClassName,"OnOneComboBox",7))

 

Removing the brackets per your suggestion and adding "list" did the trick.  Now setting the index is working and I'm able to append to the list.

 

 

 

View solution in original post

baxatob
Community Hero

Re: Python cluelessness with lists

FindAllChildren() returns list anyway. You can omit adding a list():

 

combos = dlg.FindAllChildren(QtClassName,"OnOneComboBox",7)

 

John_OR
Occasional Contributor

Re: Python cluelessness with lists

I tried it without List() and iterating through the list and setting the index works fine.  However, if I try to append to the list I get the SafeArrayWrapper error message.  When I use List() the append works as expected.  I have no clue why.

 

As you suggested the result should be the same but in practice it's not.

seco
New Member

Re: Python cluelessness with lists

I have a problem with VBScript for a long time. Wondering that there are some people still using it!

However, I found this tutorial very useful for Python lists.

 

 

dasaravi
New Contributor

Re: Python cluelessness with lists

This is another very good reference on what is a list in Python. It cites several examples that can guide to many related problems.

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