Add steps and downloads example.

examples/steps_and_downloading_file.py

@@ -0,0 +1,65 @@
+import asyncio
+import logging
+
+from aiogram import Bot, types
+from aiogram.dispatcher import Dispatcher
+from aiogram.types import ContentType
+
+API_TOKEN = 'BOT TOKEN HERE'
+
+logging.basicConfig(level=logging.INFO)
+
+loop = asyncio.get_event_loop()
+bot = Bot(token=API_TOKEN, loop=loop)
+dp = Dispatcher(bot)
+
+
+@dp.message_handler(commands=['start'])
+async def send_welcome(message):
+    await message.reply("Hi!\nI'm EchoBot!\nPowered by aiogram.")
+
+
+@dp.message_handler(commands=['sticker'])
+async def save_sticker(message):
+    async def handle_bad_message(msg):
+        """
+        Handler for unknown messages
+        """
+        await msg.reply('That is not a sticker!')
+
+    # Create an reply markup (ForceReply)
+    markup = types.ForceReply(selective=True)
+
+    # Send reply to user
+    await message.reply('Please send me a sticker.', reply_markup=markup)
+
+    # Wait next message
+    # It can only be a sticker
+    msg = await dp.next_message(message,
+                                content_types=[ContentType.STICKER],
+                                otherwise=handle_bad_message)
+
+    # Download file to memory (io.BytesIO)
+    photo = await bot.download_file(msg.sticker.file_id)
+    # And you can use other syntax:
+    #   photo = io.BytesIO()
+    #   await bot.download_file(msg.sticker.file_id, photo)
+    # Or use filename for download file to filesystem:
+    #   await bot.download_file(msg.sticker.file_id, 'sticker.webp')
+
+    # Send photo to user
+    await bot.send_photo(message.chat.id, photo, caption=msg.sticker.emoji,
+                         reply_to_message_id=message.message_id)
+
+
+async def main():
+    count = await dp.skip_updates()
+    print(f"Skipped {count} updates.")
+    await dp.start_pooling()
+
+
+if __name__ == '__main__':
+    try:
+        loop.run_until_complete(main())
+    except KeyboardInterrupt:
+        loop.stop()