Added math expressions parser

parser/tests/test_parser.py

@@ -0,0 +1,14 @@
+from parser import Parser
+
+
+def test_Parser():
+    parser = Parser("(-b + sqrt(b^2-4a c))/(2a)")
+
+    assert parser.variables_names == {"c", "a", "b"}
+
+    assert parser.evaluate({"a": 1, "b": -3, "c": 2}) == 1.0
+
+    assert all(
+        parser.evaluate({"a": [1, 1, 1], "b": [-5, -6, -9], "c": [6, 9, 20]})
+        == [2.0, 3.0, 4.0]
+    )