[issue44608] Memory use increase in function _tkinter._flatten

[stardust222]

New submission from stardust222 <490661700 at qq.com>:

In the following code, the memory use of function _tkinter._flatten is increase as the number of calls when I input an illegal value.


import sys
import tracemalloc
import _tkinter

arg_list = []
arg_list.append('ptqiioaaejhdoat')

# check for memory usage
memory_recorder = []
tracemalloc.start()
start_snapshot = tracemalloc.take_snapshot()
for i in range(0, 100):
  try:
    _tkinter._flatten(arg_list[0])
  except:
    pass
  if i % 10 == 0:
    one_snapshot = tracemalloc.take_snapshot()
    memory_recorder.append(one_snapshot.compare_to(start_snapshot, 'lineno')[0])

for i in range(2, len(memory_recorder)):
  if str(memory_recorder[i].traceback) == str(memory_recorder[1].traceback):
    print(memory_recorder[i].traceback)
    print(memory_recorder[i].size)

tracemalloc.stop()

And the output on my machine is 
test.py:19
3248
test.py:19
4800
test.py:19
6448
test.py:19
8000
test.py:19
9648
test.py:19
11248
test.py:19
12848
test.py:19
14400

----------
components: C API
messages: 397287
nosy: Stardust1225
priority: normal
severity: normal
status: open
title: Memory use increase in function _tkinter._flatten
type: resource usage
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44608>
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