chore: Matplotlib/plotting should be an optional dependency #10

- Remove matplotlib from requirements.txt
- Add extras_require for plotting in setup.py
- Update contact email in setup.py
- Add import error handling for matplotlib in classes.py for missing optional requirement

Author: amogorkon

requirements.txt

@@ -1,5 +1,4 @@
 #python >= 3.7
 numpy
-matplotlib
 hypothesis
 pandas

setup.py

@@ -4,15 +4,15 @@
 
 from setuptools import find_packages, setup
 
+from src.fuzzylogic import __version__
+
 here = os.path.abspath(os.path.dirname(__file__))
 src = os.path.join(here, "src/fuzzylogic")
 sys.path.append(src)
 
-
 __license__ = "MIT"
-__version__ = "1.4.0"
 __author__ = "Anselm Kiefner"
-__contact__ = "fuzzylogic-pypi@anselm.kiefner.de"
+__contact__ = "fuzzylogic@anselm.kiefner.de"
 
 classifiers = [
     "Development Status :: 5 - Production/Stable",
@@ -39,10 +39,13 @@
     description="Fuzzy Logic for Python 3",
     license=__license__,
     url="https://github.com/amogorkon/fuzzylogic",
-    version=__version__,
+    version=".".join(str(c) for c in __version__),
     author=__author__,
     author_email=__contact__,
     python_requires=">=3.12",
     keywords="fuzzy logic",
     classifiers=classifiers,
+    extras_require={
+        "plotting": ["matplotlib"],
+    },
 )

src/fuzzylogic/classes.py

@@ -5,9 +5,18 @@
 adding logical operaitons for easier handling.
 """
 
-from typing import Callable
+from typing import Callable, Iterable
+
+try:
+    import matplotlib.pyplot as plt
+except ImportError:
+
+    def plt(*args, **kwargs):
+        raise ImportError(
+            "matplotlib not available. Please re-install with 'pip install fuzzylogic[plotting]'"
+        )
+
 
-import matplotlib.pyplot as plt
 import numpy as np
 
 from .combinators import MAX, MIN, bounded_sum, product, simple_disjoint_sum