Add link property to Bot (#1770)

* added link property to bot

link property was available in User and Chat objects but not in Bot which was inconsistent.

* added 'link' property to Bot object

Bot will always have username so it does not require hasattr check

* add tests

Co-authored-by: Hinrich Mahler <hinrich.mahler@freenet.de>

telegram/bot.py

@@ -223,6 +223,13 @@ class Bot(TelegramObject):
 
         return self.bot.username
 
+    @property
+    @info
+    def link(self):
+        """:obj:`str`: Convenience property. Returns the t.me link of the bot."""
+
+        return "https://t.me/{}".format(self.username)
+
     @property
     def name(self):
         """:obj:`str`: Bot's @username."""

tests/test_bot.py

@@ -87,6 +87,7 @@ class TestBot(object):
         assert get_me_bot.first_name == bot.first_name
         assert get_me_bot.last_name == bot.last_name
         assert get_me_bot.name == bot.name
+        assert 'https://t.me/{}'.format(get_me_bot.username) == bot.link
 
     @flaky(3, 1)
     @pytest.mark.timeout(10)