C:\Users\Terry>py -2 -m idlelib.idle -c "print True"
>>> 
*** Error in script or command!
Traceback (most recent call last):
  File "<pyshell#0>", line 1
    print True
             ^
SyntaxError: invalid syntax

https://stackoverflow.com/questions/30280525/python-idle-give-a-false-syntax-error
In answer, phihag points out that PyShell.py has future import and compiles with
  code = compile(source, filename, "exec")

The fix is to add dont_inherit=True.