Difficulty installing Pycrypto

[snippsat]

Quick test i get no error on import,as most of the time when i test stuff that can have problem virtual environment.
Then is isolated of all i done an installed before.

E:\div_code
λ python -m venv pysftp_env

E:\div_code
λ cd pysftp_env\

E:\div_code\pysftp_env
λ E:\div_code\pysftp_env\Scripts\activate

(pysftp_env) E:\div_code\pysftp_env
λ pip install pysftp
Collecting pysftp .....  
Successfully installed bcrypt-3.1.7 cffi-1.14.0 cryptography-2.8 paramiko-2.7.1 pycparser-2.19 pynacl-1.3.0 pys
ftp-0.2.9 six-1.14.0

(pysftp_env) E:\div_code\pysftp_env
λ python
Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 21:26:53) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import pysftp
>>>
>>> pysftp.__version__
'0.2.9'
>>> exit()

Test connect:

(pysftp_env) E:\div_code\pysftp_env
λ python
Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 21:26:53) [MSC v.1916 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import pysftp
>>>
>>> cnopts = pysftp.CnOpts()
>>> cnopts.hostkeys = None
>>> con =  pysftp.Connection('198.18.8.139', username='tester', password='password', cnopts=cnopts)
>>> con.listdir()
['testfile.txt']
>>> con.get('testfile.txt')
>>> exit()

(pysftp_env) E:\div_code\pysftp_env
λ cat testfile.txt
This is a test file created by Rebex Tiny SFTP server.