Use venv module rather than virtualenv

- simpler to use
- lighter dependency (or no dependency at all, depending on python distribution)
- retrocompatible

virtualenv package from pip to acheive virtual environment feature is no longer
needed, except for projects which need to support py2, which is no longer our
case.

Also, reword "virtualenv" to "virtual environment" in doc, to avoid confusion
with pip package name.

Ref #483

4 files changed, 15 insertions, 15 deletions

diff --git a/Makefile b/Makefile
index a681709..e2fbf32 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-VIRTUALENV = virtualenv --python=python3
+VIRTUALENV = python3 -m venv
 SPHINX_BUILDDIR = docs/_build
 VENV := $(shell realpath $${VIRTUAL_ENV-.venv})
 PYTHON = $(VENV)/bin/python3
diff --git a/docs/contributing.rst b/docs/contributing.rst
index 8e0d69a..7b4f8a5 100644
--- a/docs/contributing.rst
+++ b/docs/contributing.rst
@@ -67,7 +67,7 @@ If System :ref:`installation-requirements` are fulfilled, you can just issue::
 
     make serve
 
-It will setup a `virtualenv <https://pypi.python.org/pypi/virtualenv>`_,
+It will setup a `Virtual environment <https://docs.python.org/3/tutorial/venv.html>`_,
 install dependencies, and run the test server.
 
 The hard way
@@ -193,7 +193,7 @@ The documentation is using `sphinx <http://www.sphinx-doc.org/en/stable/>`_ and
 its source is located inside the `docs folder
 <https://github.com/spiral-project/ihatemoney/tree/master/docs>`_.
 
-Install doc dependencies (within the virtualenv, if any)::
+Install doc dependencies (within the virtual environment, if any)::
 
   pip install -r docs/requirements.txt
 
diff --git a/docs/installation.rst b/docs/installation.rst
index 4d37af8..b33fb55 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -21,9 +21,9 @@ Requirements
 
 * **Python**: either 3.6, 3.7 or 3.8 will work.
 * **A Backend**: to choose among MySQL, PostgreSQL, SQLite or Memory.
-* **Virtualenv** (recommended): `virtualenv` package under Debian/Ubuntu.
+* **Virtual environment** (recommended): `python3-venv` package under Debian/Ubuntu.
 
-We recommend to use `virtualenv <https://pypi.python.org/pypi/virtualenv>`_ but
+We recommend to use `virtual environment <https://docs.python.org/3/tutorial/venv.html>`_ but
 it will work without if you prefer.
 
 If wondering about the backend, SQLite is the simplest and will work fine for
@@ -33,16 +33,16 @@ most small to medium setups.
 
 .. _virtualenv-preparation:
 
-Prepare virtualenv (recommended)
-================================
+Prepare virtual environment (recommended)
+=========================================
 
 Choose an installation path, here `/home/john/ihatemoney`.
 
-Create a virtualenv::
+Create a virtual environment::
 
-    virtualenv  -p /usr/bin/python3 /home/john/ihatemoney
+    python3 -m venv /home/john/ihatemoney
 
-Activate the virtualenv::
+Activate the virtual environment::
 
     source /home/john/ihatemoney/bin/activate
 
@@ -74,7 +74,7 @@ Configure database with MySQL/MariaDB (optional)
 
     apt install python3-dev libssl-dev
 
-2. Install PyMySQL (within your virtualenv)::
+2. Install PyMySQL (within your virtual environment)::
 
     pip install 'PyMySQL>=0.9,<0.10'
 
@@ -87,7 +87,7 @@ Configure database with PostgreSQL (optional)
 
 .. note:: Only required if you use Postgresql.
 
-1. Install python driver for PostgreSQL (from within your virtualenv)::
+1. Install python driver for PostgreSQL (from within your virtual environment)::
 
     pip install psycopg2
 
diff --git a/docs/upgrade.rst b/docs/upgrade.rst
index 560c2a9..0db0428 100644
--- a/docs/upgrade.rst
+++ b/docs/upgrade.rst
@@ -15,7 +15,7 @@ General procedure
 
 *(sufficient for minor/patch upgrades)*
 
-1. From the virtualenv (if any)::
+1. From the virtual environment (if any)::
 
     pip install -U ihatemoney
 
@@ -47,7 +47,7 @@ Switch to a supported version of Python
 If you were running IHateMoney using Python < 3.6, you must, **before** upgrading:
 
 1. Ensure to have a Python ≥ 3.6 available on your system
-2. Rebuild your virtualenv (if any). It will *not* alter your database nor configuration. For example, if your virtualenv is in `/home/john/ihatemoney/`::
+2. Rebuild your virtual environment (if any). It will *not* alter your database nor configuration. For example, if your virtual environment is in `/home/john/ihatemoney/`::
 
      rm -rf /home/john/ihatemoney
      pyhton3 -m venv /home/john/ihatemoney
@@ -89,7 +89,7 @@ development only.
 1. Delete the cloned folder
 
 
-.. note:: If you are using a virtualenv, then the following commands should be run inside it (see
+.. note:: If you are using a virtual environment, then the following commands should be run inside it (see
           :ref:`virtualenv-preparation`).