Disclaimer: I am not familiar with PyQt (or much with Python at all, in fact).

There is no problem at all connecting signals and slots between different classes, as long as those classes are both QObject derived. So in fact, you are connecting two QObjects always.

ictsecurity0 wrote:

hai,

1. self.connect(self.lineedit, QtCore.SIGNAL("returnPressed()"), MyDisplay.updateUi())

The syntax should be the same on PyQt as on C++:

Volker wrote:

ictsecurity0 wrote:

hai,

1. self.connect(self.lineedit, QtCore.SIGNAL("returnPressed()"), MyDisplay.updateUi())

The syntax should be the same on PyQt as on C++:

1. self.connect(self.lineedit, QtCore.SIGNAL("returnPressed()"), MyDisplay, QtCore.SLOT("updateUi()"))

still got the error. I tried alot of method to pass the signal of ‘returnPassed()’ to another class.

the error“IdentationError:expected an indented block..

My code is here http://pastebin.com/wBhWGxCX

i just want to do some simple print feature but failed

thanks

The code in your pastebin has mismatched parenthesis, I think.

ictsecurity0 wrote:

still got the error. I tried alot of method to pass the signal of ‘returnPassed()’ to another class.

the error“IdentationError:expected an indented block..

I’m by no means a Python export, but that error message looks quite unrelated to Qt… Did you mix up spaces and tabs?

i solved the problem with using lambda:

self.connect(lineedit, QtCore.SIGNAL’), lambda: MyDisplay().updateUi())

anyway, thanks :)

I think you could have solved it with just an additional closing parentheses ) after the connect statement in your original code…