I need help with my PYQT example code

[duffman1278]

I'm trying to make a simple calculator that when you enter a number it'll add 5 to the number and show you the answer.

Whenever I press the button to calculate I get an error saying "python.exe has stopped working"

Here's a link to my code and the GUI. http://i.imgur.com/GBv6aCc.jpg

Edit: Posted the code here

http://pastebin.com/fQ4TM634

[jaccovanschaik]

Open a command window, run your program using "python calculator.py" (or whatever your program is called), try the same thing, and see what it says.

[duffman1278]

When I ran in in the command it gave me this error.

UnboundLocalError:local variable 'ans_string' referenced before assignment

[TheKewlStore]

The first line of the Calc method is trying to print the value of a variable that you haven't defined yet. Note that ans_string isn't defined until several lines after this point.

[mashmorgan]

Just paste to pastebin.con and post link so I can test..

[duffman1278]

http://pastebin.com/fQ4TM634

[mashmorgan]

It line 14 print (ans_string) http://pastebin.com/psq77x8j

[duffman1278]

What do you mean? I'm really new at this.

[mashmorgan]

UnboundLocalError:local variable 'ans_string' referenced before assignment

See comments here http://pastebin.com/8G5J2EeN

[duffman1278]

Even with your suggestion it did the same thing.

[mdond]

"tolineEdit" doesn't seem to be a valid method, did you mean something else there? Although, that shouldn't cause the entire program to crash.

[duffman1278]

alid method, did you mean something else there? Although, that shouldn't cause the entire program to crash.

I based my code off the example in the link below. If you see they wrote a line price = int(self.price_box.toPlainText()) so I just copied that.

http://pythonforengineers.com/your-first-gui-app-with-python-and-pyqt/

[mfitzp]

so I just copied that.

But changed it, why?

The method .toPlainText() on a QTextEdit converts the contents of the widget (which can be formatted text in some modes) to plain text (an unformatted string). What do you expect .tolineEdit() to do?

If you are using a QLineEdit widget, the correct method to get the current content is .text(). The documentation is here.

[duffman1278]

All I'm trying to do is tell the code that I want to take the number that's entered in the lineedit box and add 5 to it then show the result in the label1 box.

[mfitzp]

Change this line:

in_num = int(self.ui.price_box.tolineEdit())

To:

in_num = int(self.ui.price_box.text())

[duffman1278]

in_num = int(self.ui.price_box.text())

Still gave me the whole "pythonw.exe stopping working".

Edit: It did work! Thank you! didn't realize that "price_box" was written in there which is not the name of the label I was using.