New submission from serge g <sergeg.2kgr...@gmail.com>:

I am not sure if it is python's issue (correct me if this is wrong place for 
report). But sometimes (probably every 3-4 attempt) when I run script, 
interpreter just stucks for some time (0.5-3 minutes) and then actually runs 
the script normally.

To figure out what happens I increased verbosity (python -vv) and actually 
python hangs on import on this line:

...
# trying 
/home/2kg/spider/venv/lib/python3.7/site-packages/cryptography/hazmat/primitives/kdf/scrypt.abi3.so
# trying 
/home/2kg/spider/venv/lib/python3.7/site-packages/cryptography/hazmat/primitives/kdf/scrypt.so
# trying 
/home/2kg/spider/venv/lib/python3.7/site-packages/cryptography/hazmat/primitives/kdf/scrypt.py
# 
/home/2kg/spider/venv/lib/python3.7/site-packages/cryptography/hazmat/primitives/kdf/__pycache__/scrypt.cpython-37.pyc
 matches 
/home/2kg/spider/venv/lib/python3.7/site-packages/cryptography/hazmat/primitives/kdf/scrypt.py
# code object from 
'/home/2kg/spider/venv/lib/python3.7/site-packages/cryptography/hazmat/primitives/kdf/__pycache__/scrypt.cpython-37.(pyc'
(here >>>>>) import 'cryptography.hazmat.primitives.kdf.scrypt' # 
<_frozen_importlib_external.SourceFileLoader object at 0x7f5c6e3c73c8>
import 'cryptography.hazmat.backends.openssl.backend' # 
<_frozen_importlib_external.SourceFileLoader object at 0x7f5c6c129c88>
import 'cryptography.hazmat.backends.openssl' # 
<_frozen_importlib_external.SourceFileLoader object at 0x7f5c6d30d240>
# trying 
/home/2kg/spider/venv/lib/python3.7/site-packages/cryptography/x509/UnsupportedExtension.cpython-37m-x86_64-linux-gnu.so
# trying 
/home/2kg/spider/venv/lib/python3.7/site-packages/cryptography/x509/UnsupportedExtension.abi3.so
# trying 
/home/2kg/spider/venv/lib/python3.7/site-packages/cryptography/x509/UnsupportedExtension.so
# trying 
/home/2kg/spider/venv/lib/python3.7/site-packages/cryptography/x509/UnsupportedExtension.py
# trying 
/home/2kg/spider/venv/lib/python3.7/site-packages/cryptography/x509/UnsupportedExtension.pyc
...

I had version 3.5 installed before and didn't notice such issue. Other scripts 
from my project suffer from this symptom as well.

My configuration is:
debian 9
python 3.7.3 [GCC 6.3.0 20170516] on linux
cryptography module – version 2.6.1

----------
components: Library (Lib)
messages: 340722
nosy: serge g
priority: normal
severity: normal
status: open
title: Python script on startup stucks at import
type: performance
versions: Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36706>
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