Use rules_python to provide pip dependencies

Setup a hermetic Python 3.10 interpreter and pip environment with numpy,
matplotlib, pandas, and tornado.

This commit defines a `//scripts:plot_data` py_binary that uses the
provided interpreter and pip environment:

 bazel run //scripts:plot_data -- <abs-path-csvfile>

Due to the Bazel execution root, the absolute path to the csvfile must
be provided.

Change-Id: I039c77b81a37ae4abd4f2b1bb2fd2f8613c05ad9

WORKSPACE.bazel

@@ -360,3 +360,38 @@ http_archive(
 load("@hedron_compile_commands//:workspace_setup.bzl", "hedron_compile_commands_setup")
 
 hedron_compile_commands_setup()
+
+http_archive(
+    name = "rules_python",
+    sha256 = "0a8003b044294d7840ac7d9d73eef05d6ceb682d7516781a4ec62eeb34702578",
+    strip_prefix = "rules_python-0.24.0",
+    url = "https://github.com/bazelbuild/rules_python/releases/download/0.24.0/rules_python-0.24.0.tar.gz",
+)
+
+#load("@rules_python//python:repositories.bzl", "py_repositories")
+#
+#py_repositories()
+
+load("@rules_python//python:repositories.bzl", "python_register_toolchains")
+
+python_register_toolchains(
+    name = "python3_10",
+    python_version = "3.10",
+)
+
+load("@rules_python//python/pip_install:repositories.bzl", "pip_install_dependencies")
+
+pip_install_dependencies()
+
+load("@rules_python//python:pip.bzl", "pip_parse")
+load("@python3_10//:defs.bzl", "interpreter")
+
+pip_parse(
+    name = "pip",
+    python_interpreter_target = interpreter,
+    requirements = "//python:requirements.txt",
+)
+
+load("@pip//:requirements.bzl", "install_deps")
+
+install_deps()

python/BUILD.bazel

@@ -0,0 +1,4 @@
+load("@rules_python//python:pip.bzl", "compile_pip_requirements")
+
+# https://github.com/bazelbuild/rules_python/blob/1722988cc407b08a4e7770295452076706823f9d/docs/pip.md#compile_pip_requirements
+compile_pip_requirements(name = "requirements")

python/requirements.in

@@ -0,0 +1,4 @@
+numpy
+matplotlib
+pandas
+tornado

python/setup.bzl

@@ -0,0 +1,18 @@
+# Copyright 2023 Toyota Motor Corporation. All rights reserved.
+# Copyright 2022-2023 Woven Planet. All rights reserved.
+"""
+Sets up Python environment with Pip dependencies for users of @bazel_tooling.
+"""
+
+load("@python3_10//:defs.bzl", "interpreter")
+load("@rules_python//python:pip.bzl", "pip_parse")
+load("//python:requirements.bzl", "install_deps")
+
+def tooling_python_setup():
+    pip_parse(
+        name = "pip",
+        python_interpreter_target = interpreter,
+        requirements = "//python:requirements.txt",
+    )
+
+    install_deps()

scripts/BUILD.bazel

@@ -0,0 +1,13 @@
+load("@rules_python//python:defs.bzl", "py_binary")
+load("@pip//:requirements.bzl", "requirement")
+
+py_binary(
+    name = "plot_data",
+    srcs = ["plot_data.py"],
+    deps = [
+        requirement("numpy"),
+        requirement("matplotlib"),
+        requirement("pandas"),
+        requirement("tornado"),
+    ],
+)

scripts/plot_data.py

@@ -13,10 +13,11 @@
 import argparse
 
 import matplotlib.pyplot as plt
+plt.switch_backend('WebAgg')
+
 import numpy as np
 import pandas as pd
 
-
 def plot(csvfile):
     """Returns a matplotlib axes with data in ``csvfile`` plotted.
 
@@ -34,19 +35,19 @@ def plot(csvfile):
 
     """
 
-    df = pd.read_csv(csvfile, index_col='time')
+    df = pd.read_csv(csvfile, index_col='time', sep = ';')
 
     fig, axes = plt.subplots(5, 1, sharex=True)
 
     df[['ay', 'az']].plot(ax=axes[0])
 
-    df['wz'].pot(ax=axes[1])
+    df['wx'].plot(ax=axes[1])
 
-    df[['theta_a', 'theta_af']].apply(np.rad2deg).plot(axes[2])
+    df[['theta_a', 'theta_af']].apply(np.rad2deg).plot(ax=axes[2])
 
-    df[['theta_g', 'theta_gf']].apply(np.rad2deg).plot(axes[3])
+    df[['theta_g', 'theta_gf']].apply(np.rad2deg).plot(ax=axes[3])
 
-    df['theta'].apply(np.rad2deg).plot(axes[4])
+    df['theta'].apply(np.rad2deg).plot(ax=axes[4])
 
     return axes
 
@@ -57,5 +58,5 @@ def plot(csvfile):
     parser.add_argument('csvfile')
     args = parser.parse_args()
 
-    plot(args.csvfile)
+    axis = plot(args.csvfile)
     plt.show()