Change path to python for Windows os

[tarasfrompir]

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[erogol]

Hey thanks for the PR but why do we assume python for win32?

[tarasfrompir]

Because it is written in the sys module documentation -
Windows | 'win32'

https://docs.python.org/3/library/sys.html

[erogol]

@tarasfrompir do you mind signing the CLA for me to merge the PR

[akx]

The correct, platform-and-virtualenv-agnostic way to do this is sys.executable.

Suggested change

	if sys.platform == 'win32':
	p = subprocess.Popen(["python"] + command, stdout=stdout, env=my_env) # pylint: disable=consider-using-with
	else:
	p = subprocess.Popen(["python3"] + command, stdout=stdout, env=my_env) # pylint: disable=consider-using-with
	p = subprocess.Popen([sys.executable, *command], stdout=stdout, env=my_env) # pylint: disable=consider-using-with

[erogol]

I guess we don't need to run this if it is not Win32.