import pysftp

DOWNLOAD = {
"USERNAME": "username",
"PASSWORD": "password"
}

FTP_SITE = 'sftp.mysite.com'

srv = pysftp.Connection(host=FTP_SITE, username=DOWNLOAD['USERNAME'],
                    password=DOWNLOAD['PASSWORD']

---------------------------------------------------------------------------
SSHException                              Traceback (most recent call last)
<ipython-input-47-205bb7b4b59b> in <module>()
      5
      6 srv = pysftp.Connection(host=FTP_SITE, username=DOWNLOAD['USERNAME'],
----> 7                         password=DOWNLOAD['PASSWORD'])

C:UsersAlexAnaconda2libsite-packagespysftp__init__.pyc in __init__(self, host, username, private_key, password, port, private_key_pass, ciphers, log, cnopts, default_path)
    130         # check that we have a hostkey to verify
    131         if self._cnopts.hostkeys is not None:
--> 132             self._tconnect['hostkey'] = self._cnopts.get_hostkey(host)
    133
    134         self._sftp_live = False

C:UsersAlexAnaconda2libsite-packagespysftp__init__.pyc in get_hostkey(self, host)
     69         kval = self.hostkeys.lookup(host)  # None|{keytype: PKey}
     70         if kval is None:
---> 71             raise SSHException("No hostkey for host %s found." % host)
     72         # return the pkey from the dict
     73         return list(kval.values())[0]

SSHException: No hostkey for host sftp.mysite.com found.

cnopts = pysftp.CnOpts()
cnopts.hostkeys = None
srv = pysftp.Connection(host=FTP_SITE, username=DOWNLOAD['USERNAME'],
                         password=DOWNLOAD['PASSWORD'], cnopts=cnopts)