Python cluelessness with lists

[John_OR]

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

[NisHera]

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]

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]

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]

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 · Accepted solution]

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.

[baxatob]

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

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

[John_OR]

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]

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]

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