Replaced python interpreter with python3 (#1214)

Co-authored-by: Brian Rutledge <brian@bhrutledge.com>

Author: chrysle

source/guides/analyzing-pypi-package-downloads.rst

@@ -311,7 +311,7 @@ Install `pypinfo`_ using pip.
 
 .. code-block:: bash
 
-    python -m pip install pypinfo
+    python3 -m pip install pypinfo
 
 Usage:
 

source/guides/distributing-packages-using-setuptools.rst

@@ -72,7 +72,7 @@ sample project <https://github.com/pypa/sampleproject>`_.
 
 2. It's the command line interface for running various commands that
    relate to packaging tasks. To get a listing of available commands, run
-   ``python setup.py --help-commands``.
+   ``python3 setup.py --help-commands``.
 
 
 setup.cfg
@@ -677,7 +677,7 @@ Change directory to the root of the project directory and run:
 
 .. code-block:: bash
 
-   python -m pip install -e .
+   python3 -m pip install -e .
 
 
 The pip command-line flag ``-e`` is short for ``--editable``, and ``.`` refers
@@ -712,7 +712,7 @@ Lastly, if you don't want to install any dependencies at all, you can run:
 
 .. code-block:: bash
 
-   python -m pip install -e . --no-deps
+   python3 -m pip install -e . --no-deps
 
 
 For more information, see the
@@ -812,7 +812,7 @@ To build the wheel:
 
     .. code-block:: bash
 
-        python -m build --wheel
+        python3 -m build --wheel
 
 .. tab:: Windows
 

source/guides/github-actions-ci-cd-sample/publish-to-test-pypi.yml

@@ -15,13 +15,13 @@ jobs:
         python-version: "3.x"
     - name: Install pypa/build
       run: >-
-        python -m
+        python3 -m
         pip install
         build
         --user
     - name: Build a binary wheel and a source tarball
       run: >-
-        python -m
+        python3 -m
         build
         --sdist
         --wheel

source/guides/index-mirrors-and-caches.rst

@@ -33,12 +33,12 @@ cached copies of :term:`packages <Distribution Package>`:
    by downloading all the requirements for a project and then pointing pip at
    those downloaded files instead of going to PyPI.
 2. A variation on the above which pre-builds the installation files for
-   the requirements using :ref:`python -m pip wheel <pip:pip wheel>`:
+   the requirements using :ref:`python3 -m pip wheel <pip:pip wheel>`:
 
    .. code-block:: bash
 
-      python -m pip wheel --wheel-dir=/tmp/wheelhouse SomeProject
-      python -m pip install --no-index --find-links=/tmp/wheelhouse SomeProject
+      python3 -m pip wheel --wheel-dir=/tmp/wheelhouse SomeProject
+      python3 -m pip install --no-index --find-links=/tmp/wheelhouse SomeProject
 
 
 Caching with devpi

source/guides/multi-version-installs.rst

@@ -35,7 +35,7 @@ This can be worked around by setting all dependencies in
 ``__main__.__requires__`` before importing ``pkg_resources`` for the first
 time, but that approach does mean that standard command line invocations of
 the affected tools can't be used - it's necessary to write a custom
-wrapper script or use ``python -c '<command>'`` to invoke the application's
+wrapper script or use ``python3 -c '<command>'`` to invoke the application's
 main entry point directly.
 
 Refer to the `pkg_resources documentation