When I run the tool, get error: AttributeError: 'module' object has no attribute 'SSL_ST_INIT'

[buptwsg]

HI,
Please help me. I get error:
File "/usr/lib/python2.7/site-packages/OpenSSL/SSL.py", line 118, in
SSL_ST_INIT = _lib.SSL_ST_INIT
AttributeError: 'module' object has no attribute 'SSL_ST_INIT'

My OS is CentOS, and when I install isign, the output is :
/usr/bin/pip install isign
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Looking in indexes: http://mirrors.cloud.aliyuncs.com/pypi/simple/
Requirement already satisfied: isign in /usr/lib/python2.7/site-packages (1.6.15)
Requirement already satisfied: construct==2.5.2 in /usr/lib/python2.7/site-packages (from isign) (2.5.2)
Requirement already satisfied: memoizer==0.0.1 in /usr/lib/python2.7/site-packages (from isign) (0.0.1)
Requirement already satisfied: biplist==0.9 in /usr/lib/python2.7/site-packages (from isign) (0.9)
Collecting pyOpenSSL==0.15.1
Downloading http://mirrors.cloud.aliyuncs.com/pypi/packages/37/2f/840f2656e4bcf257cb814825bb751a9197ca6f39f1fa036ab111920ac7ef/pyOpenSSL-0.15.1-py2.py3-none-any.whl (102 kB)
|################################| 102 kB 34.9 MB/s
Requirement already satisfied: six in /usr/lib/python2.7/site-packages (from construct==2.5.2->isign) (1.14.0)
Requirement already satisfied: cryptography>=0.7 in /usr/lib64/python2.7/site-packages (from pyOpenSSL==0.15.1->isign) (2.8)
Requirement already satisfied: cffi!=1.11.3,>=1.8 in /usr/lib64/python2.7/site-packages (from cryptography>=0.7->pyOpenSSL==0.15.1->isign) (1.14.0)
Requirement already satisfied: ipaddress; python_version < "3" in /usr/lib/python2.7/site-packages (from cryptography>=0.7->pyOpenSSL==0.15.1->isign) (1.0.23)
Requirement already satisfied: enum34; python_version < "3" in /usr/lib/python2.7/site-packages (from cryptography>=0.7->pyOpenSSL==0.15.1->isign) (1.1.6)
Requirement already satisfied: pycparser in /usr/lib/python2.7/site-packages (from cffi!=1.11.3,>=1.8->cryptography>=0.7->pyOpenSSL==0.15.1->isign) (2.19)
Installing collected packages: pyOpenSSL
Successfully installed pyOpenSSL-0.15.1

It seems everything is ok, but when I run the tool, it gives me error:
AttributeError: 'module' object has no attribute 'SSL_ST_INIT'

[buptwsg]

I finally solved this issue by:

1. cd /usr/lib/python2.7/site-packages/
2. rm -rf OpenSSL
3. rm -rf pyOpenSSL-0.15.1.dist-info/
4. /usr/bin/pip install pyOpenSSL==17.5.0

Although it says: ERROR: isign 1.6.15 has requirement pyOpenSSL==0.15.1, but you'll have pyopenssl 17.5.0 which is incompatible.

/usr/bin/isign now can work.