works

WORKSPACE

@@ -0,0 +1,26 @@
+git_repository(
+    name = "io_bazel_rules_python",
+    # Patch: Invoke pip for the appropriate Python version.
+    remote = "https://github.com/uri-canva/rules_python.git",
+    commit = "b8f9dead4a2d3607455db4f87adf58c56c9de8c7",
+)
+
+git_repository(
+    name = "subpar",
+    remote = "https://github.com/q3k/subpar",
+    # Patch: do not always call atexit.
+    commit = "e32f5f71d263858eb099f79a281760f0c3aae4c6",
+)
+
+load("@io_bazel_rules_python//python:pip.bzl", "pip3_import", "pip_repositories")
+
+pip_repositories()
+
+pip3_import(
+    name = "py_deps",
+    requirements = "//py:requirements.txt",
+)
+
+load("@py_deps//:requirements.bzl", "pip_install")
+
+pip_install()

py/demo/BUILD

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+load("@subpar//:subpar.bzl", "par_binary")
+load("@py_deps//:requirements.bzl", "requirement")
+
+par_binary(
+    name = "demo",
+    srcs = ["demo.py"],
+    main = "demo.py",
+
+    legacy_create_init = False,
+    zip_safe = False,
+
+    visibility = ["//visibility:public"],
+
+    deps = [
+        requirement("numpy"),
+    ],
+)

py/demo/demo.py

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+import sys
+
+import numpy as np
+
+print('Python Version', sys.version)
+
+papiez = np.array([2,1,3,7])
+print(papiez)

py/requirements.txt

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+numpy==1.15.4