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# your code goes here
buttons = []
for i in range(0, 10):
	buttons.append(ttk.Button(WinFrame, text=str(i+1), command=lambda: button_press(i+1))
	buttons[i].grid(row=i//3+1, col=i%3, sticky=NSEW)

Traceback (most recent call last):
  File "/usr/lib/python3.4/py_compile.py", line 124, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap>", line 1532, in source_to_code
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "./prog.py", line 5
    buttons[i].grid(row=i//3+1, col=i%3, sticky=NSEW)
          ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.4/py_compile.py", line 128, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 5
    buttons[i].grid(row=i//3+1, col=i%3, sticky=NSEW)
          ^
SyntaxError: invalid syntax

Standard output is empty