Chosing the python version an pip requirements work

.bazelrc

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+run --incompatible_use_python_toolchains=false --python_top=//:python38

.gitignore

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+*.swp
+
+bazel-bazel*
+bazel-bin*
+bazel-out*
+bazel-testlogs*

BUILD

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+load("@rules_python//python:defs.bzl", "py_binary")
+load("@my_deps//:requirements.bzl", "requirement")
+
+py_runtime(
+    name = "python38",
+    interpreter_path = "/usr/local/bin/python3.8",
+)
+
+py_binary(
+    name = "main",
+    srcs = ["main.py"],
+    srcs_version = "PY3",
+    deps = [
+        requirement("pyyaml"),
+        requirement("flask"),
+    ],
+)

WORKSPACE

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+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "rules_python",
+    url = "https://github.com/bazelbuild/rules_python/releases/download/0.2.0/rules_python-0.2.0.tar.gz",
+    sha256 = "778197e26c5fbeb07ac2a2c5ae405b30f6cb7ad1f5510ea6fdac03bded96cc6f",
+)
+
+load("@rules_python//python:pip.bzl", "pip_install")
+pip_install(
+    name = "my_deps",
+    requirements = "//:requirements.txt",
+)

main.py

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+import os
+import sys
+
+import flask
+import yaml
+
+
+def main():
+    print("hello from {}".format(os.getcwd()))
+    print("version: {}".format(sys.version))
+    print("interpreter: {}".format(sys.executable))
+
+
+if __name__ == "__main__":
+    main()

requirements.txt

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+pyyaml
+flask