sf = Salesforce(password='***', username='***', security_token='***', proxies=proxies)

OpenSSL.SSL.Error: [('SSL routines', 'tls_process_server_certificate', 'certificate verify failed')]

C:workPython>python -mrequests.certs
C:Userssteej1AppDataLocalProgramsPythonPython37librunpy.py:125: RuntimeWarning: 'requests.certs' found in sys.modules after import of package 'requests', but prior to execution of 'requests.certs'; this may result in unpredictable behaviour
  warn(RuntimeWarning(msg))
C:Userssteej1AppDataLocalProgramsPythonPython37libsite-packagescertificacert.pem

python -c "import ssl; print(ssl.get_default_verify_paths())"
DefaultVerifyPaths(cafile='C:\Program Files\Common Files\SSL/cert.pem', capath=None, openssl_cafile_env='SSL_CERT_FILE', openssl_cafile='C:\Program Files\Common Files\SSL/cert.pem', openssl_capath_env='SSL_CERT_DIR', openssl_capath='C:\Program Files\Common Files\SSL/certs')

from simple_salesforce import Salesforce
from simple_salesforce import SFType
import json

print ("Start")

proxies = {
"http": "http://***.**.*.***:8080",
"https": "https://***.**.*.***:8080",
}
sf = Salesforce(password='***', username='***', security_token='***', proxies=proxies)
print ("Done building sf")

print ("Trying query")
query = 'SELECT * FROM Notice__c LIMIT 10'
result = sf.bulk.Notice__c.query(query)
print(result)

print ("End")

Start
Done building sf
Trying query
Traceback (most recent call last):
  File "C:Userssteej1AppDataLocalProgramsPythonPython37libsite-packagesurllib3contribpyopenssl.py", line 453, in wrap_socket
    cnx.do_handshake()
  File "C:Userssteej1AppDataLocalProgramsPythonPython37libsite-packagesOpenSSLSSL.py", line 1915, in do_handshake
    self._raise_ssl_error(self._ssl, result)
  File "C:Userssteej1AppDataLocalProgramsPythonPython37libsite-packagesOpenSSLSSL.py", line 1647, in _raise_ssl_error
    _raise_current_error()
  File "C:Userssteej1AppDataLocalProgramsPythonPython37libsite-packagesOpenSSL_util.py", line 54, in exception_from_error_queue
    raise exception_type(errors)
OpenSSL.SSL.Error: [('SSL routines', 'tls_process_server_certificate', 'certificate verify failed')]