absolute newbie question: Why i can not find out what my python version is?

Question

i open the platform and write :
python -v

and the the error:

>>> python -v
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'python' is not defined
>>>

i'm totaly new on python, and i know my python version is:
IronPython 2.7.3 (2.7.0.40) on .NET 4.0.30319.42000 (64-bit)
Type "help", "copyright", "credits" or "license" for more information.

Answer 1

got solved.... it has to be operated on the Command Prompt and typing the python -v to see the python version.

Newbie i guest ... thanks

Answer 2

ok so...

>>> import sys
>>> print(sys.version)
3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 14:05:16) [MSC v.1915 32 bit (Intel)]

it mean i all ready install python?

but again if a use the:

>>> python -v Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'python' is not defined >>>

same error.