diff --git a/tools/python/defs.bzl b/tools/python/defs.bzl
index edc4a91..3c38621 100644
--- a/tools/python/defs.bzl
+++ b/tools/python/defs.bzl
@@ -146,6 +146,7 @@ py_resources = rule(
 )
 
 def py_project(name=None,
+               main=None,
                lib_srcs=None,
                lib_deps=None,
                lib_data=None,
@@ -184,8 +185,10 @@ def py_project(name=None,
                                              "**/*.pyc",
                                          ])
 
+    lib_name = name if not main else "lib"
+
     py_library(
-        name=name,
+        name=lib_name,
         srcs=lib_srcs,
         deps=lib_deps,
         data=lib_data,
@@ -198,12 +201,28 @@ def py_project(name=None,
         ],
     )
 
+    if main:
+        py_binary(
+            name = name,
+            main = main,
+            imports=[
+                "src/python",
+                "src/resources",
+            ],
+            deps=[
+                lib_name,
+            ],
+            visibility = [
+                "//visibility:public",
+            ],
+        )
+
     for src in test_srcs:
         if "test_" in src:
             py_pytest(
                 name=src.split("/")[-1],
                 srcs=[src] + [f for f in test_srcs if "test_" not in f],
-                deps=[name] + (test_deps or []),
+                deps=[lib_name] + (test_deps or []),
                 data=test_data,
                 imports=[
                     "test/python",