feat: added command module for the base command

Author: ca20110820

projects/computer-algebra/command.py

@@ -0,0 +1,24 @@
+from typing import Any
+from abc import abstractmethod, ABC
+from urllib.parse import quote
+
+
+class CmdBase(ABC):
+    """Base class for all the CAS (Computer Algebra System) API Commands."""
+
+    def __init__(self, operation: str, base_url: str):
+        self.operation = operation
+        self.base_url = base_url
+
+    @abstractmethod
+    def command(self, expr: str) -> Any:
+        """
+        Command for sending request to Newton CAS API with a given expression string and returns the result from
+        the API response.
+        """
+        pass
+
+    @staticmethod
+    def url_encode(inp_str: str) -> str:
+        """Encode the input string to a URL-safe format."""
+        return quote(inp_str)