Using '+=', '-=' etc. operators inside a class's function throws SyntaxError.

[NickGeramanis]

Creating an instance object of this class inside bot.py

class Test:
    def __init__(self, value):
        self.x = 3
        self.x += value

produces the following error

Traceback (most recent call last):
  File "/home/nickger/Dev/Battlehack/venv/src/run.py", line 98, in <module>
    code_container1 = CodeContainer.from_directory(args.player[0])
  File "/home/nickger/Dev/Battlehack/venv/lib/python3.6/site-packages/battlehack20/engine/container/code_container.py", line 34, in from_directory
    return cls.from_directory_dict(code)
  File "/home/nickger/Dev/Battlehack/venv/lib/python3.6/site-packages/battlehack20/engine/container/code_container.py", line 20, in from_directory_dict
    compiled = compile_restricted(cls.preprocess(dic[filename]), filename, 'exec')
  File "/home/nickger/Dev/Battlehack/venv/lib/python3.6/site-packages/RestrictedPython/compile.py", line 205, in compile_restricted
    raise SyntaxError(result.errors)
SyntaxError: ('Line 4: Augmented assignment of attributes is not allowed.',)

[NickGeramanis]

This error is thrown even if you dont call the constructor.
In other words if the above class exists in a different file (or in the bot.py) inside the folder, the above error occurs.