initial telegram.ext setup

README.md

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+```sh
+$ sudo apt-get install --no-install-recommends python3-python-telegram-bot
+```

test.py

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+#!/usr/bin/env python3
+
+import argparse
+import logging
+import pathlib
+
+import telegram.ext
+import telegram.update
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def _start_command(
+    update: telegram.update.Update,
+    context: telegram.ext.callbackcontext.CallbackContext,
+):
+    context.bot.send_message(
+        chat_id=update.effective_chat.id,
+        text=f"context={vars(context)}\nupdate={vars(update)}",
+    )
+
+
+def _main():
+    logging.basicConfig(
+        level=logging.DEBUG,
+        format="%(asctime)s:%(levelname)s:%(name)s:%(funcName)s:%(message)s",
+        datefmt="%Y-%m-%dT%H:%M:%S%z",
+    )
+    argparser = argparse.ArgumentParser()
+    argparser.add_argument("--token-path", type=pathlib.Path, required=True)
+    args = argparser.parse_args()
+    _LOGGER.debug("args=%r", args)
+    updater = telegram.ext.Updater(
+        token=args.token_path.read_text().rstrip(), use_context=True
+    )
+    updater.dispatcher.add_handler(telegram.ext.CommandHandler("start", _start_command))
+    updater.start_polling()
+
+
+if __name__ == "__main__":
+    _main()