Add data tool

tool.py

+#!/usr/bin/env python3
+
+import argparse
+import numpy as np
+import json
+
+def generate(args):
+    """Generate a new dataset"""
+    data = np.random.normal(0, 1, 10000).tolist()
+    with open(args.output, "w") as output:
+        json.dump(data, output)
+
+
+def process(args):
+    """Process an existing dataset"""
+    with open(args.input) as input:
+        data = json.load(input)
+    data_sum = sum(data)
+    with open(args.output, "w") as output:
+        print(f"The sum is: {data_sum}", file=output)
+
+actions = {
+    "generate": generate,
+    "process": process
+}
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument("command", metavar="CMD", choices=actions,
+                        help="Run a command")
+    parser.add_argument("--input", "-i", metavar="PATH", 
+                        help="File to read")
+    parser.add_argument("--output", "-o", metavar="PATH", 
+                        help="File to write")
+
+    args = parser.parse_args()
+    actions[args.command](args)