Test Python print function call vs statement

print-test

# There is no pound-hash operator because I intend this script to be called using `py -2 print-test` or `py -3 print-test`

import sys

def test(stmt):
  sys.stdout.write('\nTesting {stmt!r}\n'.format(**locals()))
  try:
    exec(stmt)
  except Exception as e:
    sys.stderr.write('Caught: {e}\n'.format(**locals()))

sys.stdout.write('Welcome to Python {version}\n'.format(version=sys.version))

# this will fail from Python 3 because `print` is a function call and there are no parentheses
test('print sys.argv')

# this will work from Python 2 because the parentheses are essentially ignored.  `print` is still executed as a statement (not a function)
# and the parentheses just wrap a string.  They're not neceessary in this example but they don't hurt but they don't help either.  They could
# be used to express a tuple but an embedded comma such as `(expr , )` would necessary to accomplish that.
test('print(sys.argv)')