Add object interaction example

Author: gjbex

source-code/command-line-arguments/Fire/README.md

@@ -10,3 +10,5 @@ applications with a command line interface.
 1. `sayer.py`: Illustration of grouped commands.
 1. `cl_logger.py`/`log_management.py`/`log_operations.py`: logging
    from the command line example.
+1. `job.py`: simple class definition to explore interacting with
+   objects from the CLI.

source-code/command-line-arguments/Fire/job.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+import fire
+
+
+class Job:
+
+    _nodes: int
+    _ntasks: int
+
+    def __init__(self, nodes=1, ntasks=1):
+        self.nodes = nodes
+        self.ntasks = ntasks
+
+    @property
+    def nodes(self):
+        return self._nodes
+
+    @nodes.setter
+    def nodes(self, nodes):
+        self._nodes = nodes
+        return self
+
+
+    @property
+    def ntasks(self):
+        return self._ntasks
+
+    @ntasks.setter
+    def ntasks(self, ntasks):
+        self._ntasks = ntasks
+        return self
+
+    def print(self):
+        return f'nodes={self.nodes} ntasks={self.ntasks}'
+
+if __name__ == '__main__':
+    fire.Fire(Job)