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readthedocs/quick-references/faq.rst

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+===
+FAQ
+===
+
+Let's start the quick references section with some useful tips to keep in
+mind, with the hope that you will understand why certain things work the
+way that they do.
+
+.. contents::
+
+
+Code without errors doesn't work
+================================
+
+Then it probably has errors, but you haven't enabled logging yet.
+To enable logging, at the following code to the top of your main file:
+
+.. code-block:: python
+
+    import logging
+    logging.basicConfig(format='[%(levelname) 5s/%(asctime)s] %(name)s: %(message)s',
+                        level=logging.WARNING)
+
+You can change the logging level to be something different, from less to more information:
+
+.. code-block:: python
+
+    level=logging.CRITICAL  # won't show errors (same as disabled)
+    level=logging.ERROR     # will only show errors that you didn't handle
+    level=logging.WARNING   # will also show messages with medium severity, such as internal Telegram issues
+    level=logging.INFO      # will also show informational messages, such as connection or disconnections
+    level=logging.DEBUG     # will show a lot of output to help debugging issues in the library
+
+See the official Python documentation for more information on logging_.
+
+
+How can I except FloodWaitError?
+================================
+
+You can use all errors from the API by importing:
+
+.. code-block:: python
+
+    from telethon import errors
+
+And except them as such:
+
+.. code-block:: python
+
+    import time
+    try:
+        client.send_message(chat, 'Hi')
+    except FloodWaitError as e:
+        print('Flood for', e.seconds)
+        time.sleep(e.seconds)
+
+
+My account was deleted/limited when using the library
+=====================================================
+
+The library will only do things that you tell it to do. If you use
+the library with bad intentions, Telegram will hopefully ban you.
+
+However, you may also be part of a limited country, such as Iran or Russia.
+In that case, we have bad news for you. Telegram is much more likely to ban
+these numbers, as they are often used to spam other accounts, likely through
+the use of libraries like this one. The best advice we can give you is to not
+abuse the API, like calling many requests really quickly, and to sign up with
+these phones through an official application.
+
+We have also had reports from Kazakhstan and China, where connecting
+would fail. To solve these connection problems, you should use a proxy.
+
+Telegram may also ban virtual (VoIP) phone numbers,
+as again, they're likely to be used for spam.
+
+If you want to check if your account has been limited,
+simply send a private message to `@SpamBot`_ through Telegram itself.
+You should notice this by getting errors like ``PeerFloodError``,
+which means you're limited, for instance,
+when sending a message to some accounts but not others.
+
+For more discussion, please see `issue 297`_.
+
+
+How can I use a proxy?
+======================
+
+This was one of the first things described in :ref:`signing-in`.
+
+
+How do I access a field?
+========================
+
+This is basic Python knowledge. You should use the dot operator:
+
+.. code-block:: python
+
+    me = client.get_me()
+    print(me.username)
+    #       ^ we used the dot operator to access the username attribute
+
+    result = client(functions.photos.GetUserPhotosRequest(
+        user_id='me',
+        offset=0,
+        max_id=0,
+        limit=100
+    ))
+
+    # Working with list is also pretty basic
+    print(result.photos[0].sizes[-1].type)
+    #           ^       ^ ^       ^ ^
+    #           |       | |       | \ type
+    #           |       | |       \ last size
+    #           |       | \ list of sizes
+    #  access   |       \ first photo from the list
+    #  the...   \ list of photos
+    #
+    # To print all, you could do (or mix-and-match):
+    for photo in result.photos:
+        for size in photo.sizes:
+            print(size.type)
+
+
+AttributeError: 'coroutine' object has no attribute 'id'
+========================================================
+
+You either forgot to:
+
+.. code-block:: python
+
+    import telethon.sync
+    #              ^^^^^ import sync
+
+Or:
+
+.. code-block:: python
+
+    async def handler(event):
+        me = await client.get_me()
+        #    ^^^^^ note the await
+        print(me.username)
+
+
+sqlite3.OperationalError: database is locked
+============================================
+
+An older process is still running and is using the same ``'session'`` file.
+
+This error occurs when **two or more clients use the same session**,
+that is, when you write the same session name to be used in the client:
+
+* You have an older process using the same session file.
+* You have two different scripts running (interactive sessions count too).
+* You have two clients in the same script running at the same time.
+
+The solution is, if you need two clients, use two sessions. If the
+problem persists and you're on Linux, you can use ``fuser my.session``
+to find out the process locking the file. As a last resort, you can
+reboot your system.
+
+If you really dislike SQLite, use a different session storage. There
+is an entire section covering that at :ref:`sessions`.
+
+
+event.chat or event.sender is None
+==================================
+
+Telegram doesn't always send this information in order to save bandwidth.
+If you need the information, you should fetch it yourself, since the library
+won't do unnecessary work unless you need to:
+
+.. code-block:: python
+
+    async def handler(event):
+        chat = await event.get_chat()
+        sender = await event.get_sender()
+
+
+Can I use Flask with the library?
+=================================
+
+Yes, if you know what you are doing. However, you will probably have a
+lot of headaches to get threads and asyncio to work together. Instead,
+consider using `Quart <https://pgjones.gitlab.io/quart/>`_, an asyncio-based
+alternative to `Flask <flask.pocoo.org/>`_.
+
+.. _logging: https://docs.python.org/3/library/logging.html
+.. _@SpamBot: https://t.me/SpamBot
+.. _issue 297: https://github.com/LonamiWebs/Telethon/issues/297