Syntax error for simple script

[Ben S. via Python-list]

Sorry for this newbie question:

I installed Python v3.6.1 on win 7. Afterwards I tried to execute the following 
simple python script from webpage 
http://www.pythonforbeginners.com/code-s...me-script/:


Python Code: 

from datetime import datetime
now = datetime.now()
mm = str(now.month)
dd = str(now.day)
 = str(now.year)
hour = str(now.hour)
mi = str(now.minute)
ss = str(now.second)
print mm + "/" + dd + "/" +  + " " + hour + ":" + mi + ":" + ss
 
When executing

 D:\tools\python\python.exe dateParser.py

 it yields a syntax error:

  File "dateParser.py", line 17
print mm + "/" + dd + "/" +  + " " + hour + ":" + mi + ":" + ss
   ^
 SyntaxError: Missing parentheses in call to 'print'

Whats wrong?

Thank you
Peter 
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"Python launcher" required to run *.py scripts on Windows?

[Ben S. via Python-list]

As I observed v3.6.1 installs (on Windows 7) in addition to the core python 
engine a second program "Python Launcher".

As far as I read this component seems to be not necessary since it only aims to 
facilitate the handling with *.py scripts on Windows.

When I always call Python script from CommandPrompt like

D:\tools\Python\python.exe mypythonscript.py

then this Launcher should not be necessary.

Am I right?

Since I prefer to have as less prgrams installed as possible I consider to 
uninstall the Python Launcher.

Is this possible without causing trouble to Python executions?

Ben
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Check Python version from inside script? Run Pythons script in v2 compatibility mode?

[Ben S. via Python-list]

Can I somehow check from inside a Python script if the executing Python engine 
is major version v2 or v3?

I am thinking about a code similar to

if (os.python-majorversion<3)
  print hello
else
  print (hello)


Additional question:
Is there a way to execute a python script with v3 python engine in v2 
compatibility mode?
I am thinking about a command parameter like (python.exe is v3.*):

  python.exe -execute_as_v2 myscript.py 
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