add remaining code and input files from 2020

AoC2020/code/AoC18.py

@@ -0,0 +1,23 @@
+import ast
+
+
+class RewriteName(ast.NodeTransformer):
+
+    def visit_Mult(self, node):
+        return ast.Add()
+
+    def visit_Sub(self, node):
+        return ast.Mult()
+
+
+def evaluate(line):
+    line = line.replace("*", "-")[:-1]
+    line = line.replace("+", "*")
+    new = RewriteName().visit(ast.parse(line, mode='eval'))
+    return eval(compile(new, '<string>', 'eval'))
+
+
+with open(r"C:\Users\Maya\Desktop\Uni\WS_2021\AoC\input18") as f:
+    lines = f.readlines()
+    print(evaluate(lines[0]))
+    print(sum([evaluate(l) for l in lines]))