babel-extract hangs when 'writing PO template file to ./babel/messages.pot'

[LeiYangGH]

Environment

Flask-Appbuilder version: 4.5.0

pip freeze output:
aliyun-python-sdk-core==2.13.36
aliyun-python-sdk-kms==2.16.1
apispec==6.6.1
appdirs==1.4.4
async-timeout==4.0.3
atomicwrites==1.4.0
attrs==21.2.0
azure-core==1.24.2
azure-identity==1.10.0
Babel==2.15.0
bcrypt==4.0.1
blinker==1.6.2
Brotli==1.1.0
cachelib==0.9.0
cachetools==4.2.4
cattrs==1.9.0
cerence @ file:///C:/GL/ncs/tts/mobility-ncs-tts-tools/cerence-tts-oc2-proto-python
certifi==2021.10.8
cffi==1.15.1
charset-normalizer==2.0.7
click==8.1.4
colorama==0.4.6
ConfigArgParse==1.7
crcmod==1.7
cryptography==37.0.4
dataclasses-json==0.6.7
deepmerge==1.1.0
Deprecated==1.2.14
dnspython==2.6.1
dohq-artifactory==0.7.742
email_validator==2.2.0
et-xmlfile==1.1.0
exceptiongroup==1.1.3
Faker==18.7.0
filelock==3.0.4
Flask==2.3.2
Flask-AppBuilder==4.5.0
Flask-Babel==2.0.0
Flask-BasicAuth==0.2.0
Flask-Caching==2.3.0
Flask-Cors==4.0.0
Flask-JSON==0.4.0
Flask-JWT-Extended==4.6.0
Flask-Limiter==3.7.0
Flask-Login==0.6.3
Flask-SQLAlchemy==2.5.1
Flask-WTF==1.2.1
future==0.18.3
gevent==24.2.1
geventhttpclient==2.0.11
gitdb==4.0.9
GitPython==3.1.24
google-api-core==2.8.2
google-api-python-client==2.51.0
google-auth==2.3.2
google-auth-httplib2==0.1.0
googleapis-common-protos==1.56.2
greenlet==3.0.3
grpcio==1.46.3
grpcio-tools==1.46.3
httplib2==0.20.1
idna==3.3
importlib-metadata==4.12.0
importlib-resources==5.10.0
iniconfig==1.1.1
itsdangerous==2.1.2
Jinja2==3.1.2
jmespath==0.10.0
jsonschema==4.16.0
kubernetes==19.15.0
limits==3.13.0
locust==2.18.4
lxml==4.6.3
markdown-it-py==3.0.0
MarkupSafe==2.1.1
marshmallow==3.21.3
marshmallow-sqlalchemy==0.28.2
mdurl==0.1.2
msal==1.18.0
msal-extensions==1.0.0
msgpack==1.0.8
mypy-extensions==1.0.0
mysqlclient @ file:///C:/Users/yang.lei/Downloads/mysqlclient-1.4.6-cp38-cp38-win32.whl#sha256=1f4d3c3fa7d7f1683071ad12096e5494179e7fa837c5210c3032c81d72f33e3a
natsort==8.3.1
netmiko==4.2.0
nlu-spec-extract @ file:///C:/GL/ncs/tts/onecloud2.0/qa/nlu-spec-extract
ntc_templates==4.0.1
numpy==1.21.4
oauthlib==3.1.1
openpyxl==3.1.2
ordered-set==4.1.0
orjson==3.10.5
oss2==2.18.0
packaging==21.3
pandas==1.3.4
paramiko==3.3.1
pkgutil_resolve_name==1.3.10
pluggy==1.0.0
portalocker==2.5.1
prison==0.2.1
protobuf==3.20.1
psutil==5.9.8
py==1.11.0
pyasn1==0.4.8
pyasn1-modules==0.2.8
PyAudio @ file:///C:/NuanTools/py_tts/PyAudio-0.2.11-cp38-cp38-win32.whl
pycparser==2.21
pycryptodome==3.18.0
pygame==2.1.2
Pygments==2.18.0
PyJWT==2.8.0
PyMuPDF==1.23.3
PyMuPDFb==1.23.3
PyMySQL==1.1.0
PyNaCl==1.5.0
PyOgg @ file:///C:/G/PyOgg
pyparsing==2.4.7
pyproj==3.5.0
pyrsistent==0.18.1
pyserial==3.5
pytest==7.4.0
pytest-datadir==1.4.1
pytest-html==3.2.0
pytest-metadata==2.0.4
python-dateutil==2.8.2
python-gitlab==3.15.0
python-Levenshtein==0.12.2
pytz==2021.3
pywin32==304
PyYAML==6.0
pyzmq==25.1.2
qa @ file:///C:/GL/ncs/tts/onecloud2.0/qa/qa
redis==5.0.1
redlock-py==1.0.8
requests==2.26.0
requests-cache==0.8.1
requests-oauthlib==1.3.0
requests-toolbelt==1.0.0
rich==13.7.1
roundrobin==0.0.4
rsa==4.7.2
rsqa @ file:///C:/GL/ncs/tts/onecloud2.0/qa/rsqa
scp==0.14.5
six==1.16.0
smmap==5.0.0
sounddevice==0.4.6
soundfile==0.12.1
SQLAlchemy==1.4.52
SQLAlchemy-Utils==0.41.2
teamcity-messages==1.21
textfsm==1.1.3
thefuzz==0.19.0
tinydb==4.6.1
tomli==2.0.1
tts-grpc-python-client @ file:///C:/GL/ncs/tts/mobility-ncs-tts-tools/tts-grpc-python-client
typing-inspect==0.9.0
typing_extensions==4.3.0
uritemplate==4.1.1
url-normalize==1.4.3
urllib3==1.26.7
websocket-client==1.2.1
Werkzeug==2.3.6
wrapt==1.16.0
WTForms==3.1.2
xhlib @ file:///C:/G/xhlib
xmltodict==0.12.0
yamale==4.0.2
zhconv==1.4.3
zipp==3.8.1
zope.event==5.0
zope.interface==6.2

Describe the expected results

flask fab babel-extract run successfully.

Describe the actual results

the last output hangs more than 10min, so i pressed ctrl+C, no luck, then i closed the terminal.

PS C:\Users\yang.lei> C:\pv\tts\Scripts\activate.ps1
(tts) PS C:\Users\yang.lei> cd C:\G\fab
(tts) PS C:\G\fab> $Env:FLASK_APP='app/__init__.py'
(tts) PS C:\G\fab>  flask fab babel-extract
Starting Extractions config:./babel/babel.cfg input:. output:./babel/messages.pot keywords:('lazy_gettext', 'gettext', '_', '__')
Starting Update target:app/translations
Finish, you can start your translations
(tts) PS C:\G\fab> extracting messages from a.py
updating catalog app/translations\pt\LC_MESSAGES\messages.po based on ./babel/messages.pot
extracting messages from config.py
extracting messages from app\__init__.py
extracting messages from app\data.py
extracting messages from app\models.py
extracting messages from app\views.py
writing PO template file to ./babel/messages.pot

[LeiYangGH]

files generated when hanging: