Update build instructions

README.rst

@@ -33,7 +33,7 @@ only a sparse set of these covariate groups have non-zero components.
 
 There are several reasons for why this might be a good idea. Say for example 
 that we have a set of sensors and each of these sensors generate five 
-measurements. We don't want to maintain an unneccesary number of sensors. 
+measurements. We don't want to maintain an unnecessary number of sensors.
 If we try normal LASSO regression, then we will get sparse components. 
 However, these sparse components might not correspond to a sparse set of 
 sensors, since they each generate five measurements. If we instead use group 
@@ -60,12 +60,22 @@ To install group-lasso via ``pip``, simply run the command::
 
     pip install group-lasso
 
-Alternatively, you can manually pull this repository and run the
-``setup.py`` file::
+Alternatively, you can manually pull this repository and run the following commands on macOS/Unix::
 
     git clone https://github.com/yngvem/group-lasso.git
     cd group-lasso
-    python setup.py
+    python3 -m build
+
+On Windows run the following equivalent commands in PowerShell instead::
+
+    git clone https://github.com/yngvem/group-lasso.git
+    cd group-lasso
+    py -m build
+
+``setuptools`` allows you to modify your source code and have the changes taking effect without you having to rebuild and reinstall.
+To install a package without copying any files to your interpreter directory, run at the root::
+
+    pip install --editable .
 
 -------------
 Documentation

pyproject.toml

@@ -7,7 +7,7 @@
 
 [tool.black]
 line-length = 79
-target-version = ['py36', 'py37', 'py38']
+target-version = ['py36', 'py37', 'py38', 'py39']
 include = '\.pyi?$'
 exclude = '''
 /(

requirements.txt

@@ -8,3 +8,4 @@ sphinx_rtd_theme
 sphinx_gallery
 matplotlib
 numpydoc
+build

setup.cfg

@@ -11,11 +11,15 @@ classifiers =
 [options]
 packages = find:
 package_dir = 
-	=src
+	= src
 include_package_data = True
 install_requires = 
 	numpy
 	scikit-learn
 
 [options.packages.find]
 where = src
+
+[build-system]
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"

setup.py

@@ -1,7 +1,15 @@
 from setuptools import find_packages, setup
 
-with open("README.rst") as f:
-    long_description = f.read()
-
-
-setup()
+setup(name="group-lasso",
+      version="1.5.0",
+      description="Fast group lasso regularised linear models in a sklearn-style API",
+      author="Yngve Mardal Moe",
+      author_email="[email protected]",
+      url="https://group-lasso.readthedocs.io/en/latest/",
+      packages=find_packages(
+            where="src",
+            include=["group_lasso*"]
+      ),
+      package_dir={"": "src"},
+      include_package_data=True
+      )