Buildtools installation on python 3.6.4

[snippsat]

E:\1py_div
λ python -m venv sph_env

E:\1py_div
λ cd sph_env

E:\1py_div\sph_env
λ E:\1py_div\sph_env\Scripts\Activate
(sph_env) E:\1py_div\sph_env
λ pip install Sphinx

(sph_env) E:\1py_div\sph_env
λ make html
Running Sphinx v1.6.5
making output directory...
loading pickled environment... not yet created
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 24 source files that are out of date
updating environment: 24 added, 0 changed, 0 removed
reading sources... [100%] index

So it work,some error message about toctree.
It generate html files.

So would i try to install to OS Python,
no i would not if it work in virtual-environment i am finish.