due to circular reference of local variable in Exception

[heedong-jung]

Memory leak due to circular reference of local variable in Exception.

Python Packages

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pip freeze Output:

aioprocessing==1.0.1
alabaster==0.7.12
alembic==1.2.1
amqp==2.5.2
aniso8601==6.0.0
astroid==2.3.3
astropy==3.2.3
atomicwrites==1.3.0
attrs==19.3.0
auto-sklearn==0.5.2
Babel==2.7.0
backcall==0.1.0
backports.csv==1.0.7
billiard==3.6.3.0
bleach==3.1.0
boto3==1.9.160
botocore==1.12.160
catboost==0.14.2
celery==4.3.0
celery-progress==0.0.3
certifi==2019.11.28
cffi==1.14.0
chardet==3.0.4
Click==7.0
cloudpickle==1.1.1
config==0.4.2
configparser==3.7.4
ConfigSpace==0.4.7
confuse==1.0.0
coreapi==2.3.3
coreschema==0.0.4
coverage==4.5.4
cycler==0.10.0
Cython==0.29.16
databricks-cli==0.9.0
debug==0.3.2
decorator==4.4.1
defusedxml==0.6.0
diff-match-patch==20181111
dill==0.2.9
Django==2.2.2
django-cors-headers==3.0.2
django-dbconn-retry==0.1.5
django-import-export==1.2.0
django-keycloak==0.1.1
django-rest-framework==0.1.0
django-user==0.2.1
djangorestframework==3.9.4
docker==4.0.1
docutils==0.14
drf-yasg==1.16.0
ds-lime==0.1.1.27
ecdsa==0.13.2
eli5==0.10.1
entrypoints==0.3
enum34==1.1.6
et-xmlfile==1.0.1
fastparquet==0.3.2
Flask==1.0.3
future==0.17.1
gitdb2==2.0.5
GitPython==2.1.11
gorilla==0.3.0
GPy==1.9.9
GPyOpt==1.2.5
graphene==2.1.7
graphene-django==2.5.0
graphene-file-upload==1.2.2
graphql-core==2.2.1
graphql-relay==2.0.0
graphviz==0.11
gunicorn==19.9.0
h5py==2.10.0
hpbandster==0.7.4
htmlmin==0.1.12
idna==2.8
imageio==2.5.0
imagesize==1.1.0
importlib-metadata==0.20
inflection==0.3.1
ipdb==0.13.2
ipython==7.13.0
ipython-genutils==0.2.0
isort==4.3.21
itsdangerous==1.1.0
itypes==1.1.0
jdcal==1.4.1
jedi==0.16.0
Jinja2==2.10.1
jmespath==0.9.4
joblib==0.13.2
jsonschema==3.0.1
jupyter-client==5.3.4
jupyter-core==4.6.1
Keras==2.3.1
Keras-Applications==1.0.8
Keras-Preprocessing==1.1.0
kiwisolver==1.1.0
kombu==4.6.8
lazy-import==0.2.2
lazy-object-proxy==1.4.3
liac-arff==2.4.0
lightgbm==2.2.3
lime==0.1.1.34
llvmlite==0.29.0
lockfile==0.12.2
Mako==1.1.0
MarkupSafe==1.1.1
matplotlib==3.1.0
mccabe==0.6.1
memory-profiler==0.55.0
missingno==0.4.2
mistune==0.8.4
mleap==0.8.1
mlflow==1.2.0
mock==3.0.5
more-itertools==8.2.0
multiprocess==0.70.7
nbconvert==5.6.1
nbformat==4.4.0
nest-asyncio==1.2.3
netifaces==0.10.9
networkx==2.3
nose==1.3.7
nose-exclude==0.5.0
numba==0.45.1
numpy==1.16.4
objgraph==3.4.1
odfpy==1.4.0
openpyxl==2.6.2
packaging==19.0
pandas==0.24.2
pandas-profiling==2.3.0
pandocfilters==1.4.2
paramz==0.9.5
parso==0.6.0
patsy==0.5.1
PDPbox==0.2.0
pexpect==4.8.0
phik==0.9.8
pickleshare==0.7.5
Pillow==6.0.0
plotly==3.10.0
pluggy==0.12.0
prometheus-client==0.7.1
promise==2.2.1
prompt-toolkit==3.0.4
protobuf==3.8.0
psutil==5.6.2
psycopg2==2.7.5
ptyprocess==0.6.0
py==1.8.0
py4j==0.10.7
pyarrow==0.14.1
pyasn1==0.4.5
pycparser==2.20
pydot==1.4.1
pyfiglet==0.8.post1
Pygments==2.4.2
PyHive==0.6.1
pylint==2.4.3
Pympler==0.7
pynisher==0.5.0
pyparsing==2.4.0
pyrfr==0.8.0
Pyro4==4.77
pyrsistent==0.15.3
pysasl==0.5.0
pyspark==2.4.3
pytest==5.1.2
pytest-cov==2.7.1
pytest-django==3.5.1
pytest-mock==1.10.4
pytest-pylint==0.14.1
python-dateutil==2.8.0
python-editor==1.0.4
python-jose==3.0.1
python-keycloak-client==0.2.2
pytz==2019.1
PyWavelets==1.0.3
PyYAML==5.1.1
pyzmq==18.1.1
querystring-parser==1.2.3
rabbitmq==0.2.0
requests==2.22.0
retrying==1.3.3
rsa==4.0
ruamel.yaml==0.15.97
Rx==1.6.1
s3transfer==0.2.0
sasl==0.2.1
scikit-image==0.15.0
scikit-learn==0.19.2
scipy==1.3.0
seaborn==0.9.0
see==1.4.1
Send2Trash==1.5.0
serpent==1.28
simplejson==3.16.0
singledispatch==3.4.0.3
six==1.14.0
skater==1.0.4
smac==0.8.0
smmap2==2.0.5
snowballstemmer==1.2.1
sobol-seq==0.1.2
spark-celery==0.1.1
Sphinx==2.1.0
sphinx-rtd-theme==0.4.3
sphinxcontrib-applehelp==1.0.1
sphinxcontrib-devhelp==1.0.1
sphinxcontrib-htmlhelp==1.0.2
sphinxcontrib-jsmath==1.0.1
sphinxcontrib-qthelp==1.0.2
sphinxcontrib-serializinghtml==1.1.3
SQLAlchemy==1.3.8
sqlparse==0.3.0
statsmodels==0.10.2
tablib==0.13.0
tabulate==0.8.3
testpath==0.4.4
thrift==0.11.0
thrift-sasl==0.3.0
tornado==6.0.3
traitlets==4.3.2
typed-ast==1.4.0
typing==3.6.6
uritemplate==3.0.0
urllib3==1.25.3
vine==1.3.0
wcwidth==0.1.7
webencodings==0.5.1
websocket-client==0.56.0
Werkzeug==0.15.4
wrapt==1.11.2
xgboost==0.90
xlrd==1.2.0
xlwt==1.3.0
yellowbrick==0.9.1
zipp==0.6.0

While the Except statement was in progress, an error occurred that the Garbage Collector could not collect by referring to the f_locals of the frame.

Is it necessary to refer to Traceback_hide_ in Frame function that copies and utilizes traceback? It doesn't seem to be utilized in practice.