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Class Chats:
    def __init__(self):
    self.vk_chats = []
    self.tg_chats = []
 
    def add_vk_chat(self, vk_chat_id):
    self.vk_chats.append(vk_chat_id)
 
    def add_tg_chat(self, tg_chat_id):
        self.tg_chats.append(tg_chat_id)
 
    def remove_vk_chat(self, vk_chat_id):
        self.vk_chats.remove(vk_chat_id)
 
    def remove_tg_chat(self, tg_chat_id):
        self.tg_chats.remove(tg_chat_id)
 
    def contains(self, chat_id):
        return chat_id in self.tg_chats or chat_id in self.vk_chats
 
    def __len__(self):
        return len(self.tg_chats) + len(self.vk_chats)

Traceback (most recent call last):
  File "/usr/lib/python3.7/py_compile.py", line 143, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap_external>", line 791, in source_to_code
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "./prog.py", line 1
    Class Chats:
              ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.7/py_compile.py", line 147, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 1
    Class Chats:
              ^
SyntaxError: invalid syntax

Standard output is empty