diff --git a/pythonlib.py b/pythonlib.py
new file mode 100644
index 0000000..577de1a
--- /dev/null
+++ b/pythonlib.py
@@ -0,0 +1,74 @@
+from lexer import Lexer
+from program import Program
+from sys import stderr
+
+# Assuming Token class is accessible
+from token_definitions import Token  # replace with actual token file if needed
+
+class Interpreter:
+    def __init__(self):
+        self.lexer = Lexer()
+        self.program = Program()
+
+    def process_command(self, stmt: str) -> str:
+        try:
+            tokens = self.lexer.tokenize(stmt)
+            if not tokens:
+                return "No input provided."
+
+            first_token = tokens[0]
+
+            match first_token.category:
+                case Token.EXIT:
+                    return "Exiting interpreter."
+
+                case Token.UNSIGNEDINT:
+                    if len(tokens) == 1:
+                        # Delete statement by line number
+                        self.program.delete_statement(int(first_token.lexeme))
+                        return f"Statement deleted: {stmt}"
+                    else:
+                        # Add statement
+                        self.program.add_stmt(tokens)
+                        return f"Statement added: {stmt}"
+
+                case Token.RUN:
+                    try:
+                        self.program.execute()
+                        return "Program executed."
+                    except KeyboardInterrupt:
+                        return "Program terminated by user."
+
+                case Token.LIST:
+                    output = self.program.list()
+                    return f"Program listing:\n{output}"
+
+                case Token.SAVE:
+                    if len(tokens) > 1:
+                        filename = tokens[1].lexeme
+                        self.program.save(filename)
+                        return f"Program saved to {filename}"
+                    return "Error: No filename provided."
+
+                case Token.LOAD:
+                    if len(tokens) > 1:
+                        filename = tokens[1].lexeme
+                        self.program.load(filename)
+                        return f"Program loaded from {filename}"
+                    return "Error: No filename provided."
+
+                case Token.NEW:
+                    self.program.delete()
+                    return "Program cleared."
+
+                case _:
+                    return "Unrecognized input."
+
+        except Exception as e:
+            return f"Error: {e}"
+
+# Example usage
+if __name__ == "__main__":
+    interpreter = Interpreter()
+    print(interpreter.process_command('10 PRINT "Hello world"'))
+    print(interpreter.process_command("RUN"))