Switched build system to poetry.

.gitignore

@@ -21,3 +21,4 @@ NOTES
 .cache
 .pytest_cache
 pytest.xml
+poetry.lock

README.rst

@@ -37,21 +37,22 @@ There are currently three different long-running branches:
 Installation and Requirements
 =============================
 
-PyDelta requires **Python 3.3 or newer**. It has quite a set of dependencies (NumPy, Pandas, SciPy, SciKit-Learn, …), but it comes with a setup script that installs it with its dependencies.
+PyDelta requires **an up-to-date Python 3**. It has quite a set of dependencies (NumPy, Pandas, SciPy, SciKit-Learn, …) that are declared in its pyproject.toml.
 
 If you only wish to use it, not to hack on it, pip can clone and install it for you::
 
     pip install git+https://github.com/cophi-wue/pydelta@next
 
 (Note that the Python 3 version of pip is sometimes called ``pip3``).
 
-Developers can clone the repo and run pip to install::
+Developers can clone the repo and use [Poetry](https://python-poetry.org/) to setup a virtual environment for development.
 
     git clone -b next https://github.com/cophi-wue/pydelta
     cd pydelta
-    pip install -r requirements.txt
+    poetry install
+
+Tests can be run using `pytest`. To build the documentation `cd docs && make html`.
 
-You may need to install numpy, scipy, and Cython separately first.
 
 
 ----

pyproject.toml

@@ -0,0 +1,36 @@
+[tool.poetry]
+name = "delta"
+version = "2.1.0.dev1"
+description = "Stylometry toolkit"
+authors = [
+    "Thorsten Vitt <thorsten.vitt@uni-wuerzburg.de>",
+    "Fotis Jannidis <fotis.jannidis@uni-wuerzburg.de>"
+    ]
+license = "GPL-3.0-or-later"
+readme = "README.rst"
+
+[tool.poetry.dependencies]
+python = ">=3.7.1,<3.10"
+numpy = "^1.20.3"
+pandas = "^1.2.4"
+scipy = "^1.6.3"
+matplotlib = "^3.4.2"
+regex = "^2021.4.4"
+scikit-learn = "^0.24.2"
+scikit-learn-extra = "^0.2.0"
+joblib = "^1.0.1"
+
+[tool.poetry.dev-dependencies]
+pytest = "^6.2.4"
+pytest-cov = "^2.12.1"
+Sphinx = "^4.0.2"
+ipykernel = "^5.5.5"
+nbsphinx = "^0.8.6"
+
+[tool.pytest.ini_options]
+addopts = "--doctest-modules --junit-xml pytest.xml"
+nb_diff_ignore = "/cells/*/output"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"