With CLI and script config.

pyproject.toml

@@ -16,3 +16,6 @@ pytest = "^6.2.2"
 [build-system]
 requires = ["poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"
+
+[tool.poetry.scripts]
+pricehist = "pricehist.cli:cli"

src/pricehist/cli.py

@@ -0,0 +1,10 @@
+import sys
+
+from pricehist.location import greet
+
+def cli(args=None):
+    """Process command line arguments."""
+    if not args:
+        args = sys.argv[1:]
+    tz = args[0]
+    print(greet(tz))