Idle is unable to import unittest. and raises an attributeError.
Output of the Python shell Idle is included in the file bug idle.

several files raise this exception
on of them is included in this report
the Trace for Idle is as follows :
Python 3.6.5 (default, Apr  1 2018, 05:46:30) 
[GCC 7.3.0] on linux
Type "copyright", "credits" or "license()" for more information.
>>> 
[DEBUG ON]
>>> 
 RESTART: /home/odile/Documents/dev_logiciels/pyhton/openclassrooms/labyrinthe/roboc2/test/test_carte.py 
Traceback (most recent call last):
  File "/home/odile/Documents/dev_logiciels/pyhton/openclassrooms/labyrinthe/roboc2/test/test_carte.py", line 5, in <module>
    import unittest
  File "<frozen importlib._bootstrap>", line 968, in _find_and_load
  File "<frozen importlib._bootstrap>", line 148, in __enter__
  File "<frozen importlib._bootstrap>", line 174, in _get_module_lock
  File "<frozen importlib._bootstrap>", line 59, in __init__
  File "<frozen importlib._bootstrap>", line 59, in __init__
  File "/usr/lib/python3.6/bdb.py", line 51, in trace_dispatch
    return self.dispatch_line(frame)
  File "/usr/lib/python3.6/bdb.py", line 69, in dispatch_line
    self.user_line(frame)
  File "/usr/lib/python3.6/idlelib/debugger.py", line 24, in user_line
    self.gui.interaction(message, frame)
AttributeError: '_ModuleLock' object has no attribute 'name'
[DEBUG ON]

Idle version is 3.6.5