Why is an error thrown in pyQt5?

Question

Python

I installed Python 3.4.3 and pyQT 5. When I try to create a simple window with the code below, IDLE gives an Invalid Syntax error and, accordingly, the window is not created. I checked the syntax, everything seems to be correct. What could be the reason?
{
#!/usr/bin/python3
# -*- coding: utf-8 -*-
import sys
from PyQt5.QtWidgets import QApplication, QWidget
if __name__ == '__main__':
app = QApplication(sys.argv)
w = QWidget ()
w.resize(250, 150)
w.move(300, 300)
w.setWindowTitle('Simple')
w.show()
sys.exit(app.exec_())
}

Answer 1

Because "invalid syntax", you have an invalid syntax.
Since you couldn't paste the formatted code into the question, it's difficult to point out exactly where the error is.
Fix it.
Your _formatted_ code works for me (Ubuntu).

Answer 2

Do you also have curly braces in your script?