Telegram Export Group Members more than 10000

FloodWaitError - A wait of 30 seconds is required / Telegram Export Group Members more than 10000

aggressive=True attribute was used to export group members more than 10 K.

This attribute was used in the following line of code of Telegram export group members python script.

all_participants = client.get_participants(target_group, aggressive=True)

But recently telethon has started giving FloodWait error with this attribute.
If we remove it, or make it false, we can download members but less than 10k.

all_participants = client.get_participants(target_group, aggressive=False)

But Removing the attribute or making it false can export members of a group which has less than 10K members but it gives following error for the groups which have more than 10k members.

TypeError: 'ChannelParticipants' object is not subscriptable

github page of this issue suggests a solution for the error. Upgrade your Telethon package to 1.24.0 using following command.

python3 -m pip install --upgrade https://github.com/LonamiWebs/Telethon/archive/master.zip

but after upgrading telethon some users have started getting this new error.

Traceback (most recent call last):
  File "t1_exportgroup.py", line 1, in <module>
    from telethon.sync import TelegramClient
  File "/home/pavi/virtualenvs/telegram/lib/python3.8/site-packages/telethon/__init__.py", line 4, in <module>
    from ._misc import utils as _  # depends on helpers and _tl
  File "/home/pavi/virtualenvs/telegram/lib/python3.8/site-packages/telethon/_misc/utils.py", line 23, in <module>
    from . import markdown, html
  File "/home/pavi/virtualenvs/telegram/lib/python3.8/site-packages/telethon/_misc/markdown.py", line 8, in <module>
    import markdown_it
ModuleNotFoundError: No module named 'markdown_it'

A solution was also provided for the error. Install following packages.

pip install markdown-it-py~=1.1.0
pip install pyaes~=1.6.1
pip install rsa~=4.7.2

After applying this solution above error is gone but another error is here.

Traceback (most recent call last):
  File "t1_exportgroup.py", line 1, in <module>
    from telethon.sync import TelegramClient
ModuleNotFoundError: No module named 'telethon.sync'

Telethon 2 has removed sync module. If your export script is showing this error, you need to change the script according to the changes suggested in this version 2 migration guide.