Tidy examples and update licenses

telethon_examples/print_messages.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+# A simple script to print some messages.
+import os
+import sys
+import time
+
+from telethon import TelegramClient, events, utils
+
+
+def get_env(name, message, cast=str):
+    if name in os.environ:
+        return os.environ[name]
+    while True:
+        value = input(message)
+        try:
+            return cast(value)
+        except ValueError as e:
+            print(e, file=sys.stderr)
+            time.sleep(1)
+
+
+session = os.environ.get('TG_SESSION', 'printer')
+api_id = get_env('TG_API_ID', 'Enter your API ID: ', int)
+api_hash = get_env('TG_API_HASH', 'Enter your API hash: ')
+proxy = None  # https://github.com/Anorov/PySocks
+
+# Create and start the client so we can make requests (we don't here)
+client = TelegramClient(session, api_id, api_hash, proxy=proxy).start()
+
+
+# `pattern` is a regex, see https://docs.python.org/3/library/re.html
+# Use https://regexone.com/ if you want a more interactive way of learning.
+#
+# "(?i)" makes it case-insensitive, and | separates "options".
+@client.on(events.NewMessage(pattern=r'(?i).*\b(hello|hi)\b'))
+async def handler(event):
+    sender = await event.get_sender()
+    name = utils.get_display_name(sender)
+    print(name, 'said', event.text, '!')
+
+try:
+    print('(Press Ctrl+C to stop this)')
+    client.run_until_disconnected()
+finally:
+    client.disconnect()
+
+# Note: We used try/finally to show it can be done this way, but using:
+#
+#   with client:
+#       client.run_until_disconnected()
+#
+# is almost always a better idea.