How can I check for letters in a called array?

Question

I have a code but it doesn't work as I want. I need to call (or print) the initial letter of each element in the array as uppercase.

Or alternatively: automatically converting the first letter of every word I type in the text box to uppercase will solve my problem.(in real time)

How can I do that?

    editline_text = self.search_item_editline.GetText()
    new_list = [x for x in autoComplete.AUTOCOMPLETE_DIC_NAMES if editline_text in x]
    index = 1
    for item in new_list:
        if index > 10:
            break
        index += 1
        self.editline_list.AddItem(item)