andriisoldatenko commented on issue #5298: [WIP][AIRFLOW-4534] Remove redundant 
list around dict comprehensions
URL: https://github.com/apache/airflow/pull/5298#issuecomment-496472280
 
 
   @BasPH yes, it's known behaviour for any mutable collections:
   ```
   In [1]: d = {'a': 1, 'b': 2}
   
   In [2]: for k,v in d.items():
      ...:     d['x'] = 1
      ...:
   ---------------------------------------------------------------------------
   RuntimeError                              Traceback (most recent call last)
   <ipython-input-2-cdc4495c7b4d> in <module>
   ----> 1 for k,v in d.items():
         2     d['x'] = 1
         3
   
   RuntimeError: dictionary changed size during iteration
   ```

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