Try
text = app.calc.Static3.window_text()
As I see in Spy ++, Notepad.exe (version of Win7) has 4 static blocks. The third has non-empty text. Therefore, you need to identify it by the name "Static3" because "Static1" and "Static0" identify the same static field (which is a bit strange, yes - this is the pywinauto function).
For a more detailed study, use
app.calc.print_control_identifiers() # or .dump_tree()
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