A memory leak is when each iteration adds a fixed number of bytes of the memory: I'm talking about tracemalloc.get_traced_memory()[0] value. For example, if you compare the total traced memory between your iteration 30 and iteration 20, you get a value 10N. If you compare iteration 100 and 20, I would expect the value 80N. Is it the case?

You can get the number of allocated bytes from a snapshot using:

>>> sum(trace.size for trace in snapshot.traces)
2620350