Python 2.7: Cannot connect to SFTP server using Auth key - python-2.7

I have to connect to a remote sftp server to upload some files using python 2.7. i have been given a username, password and the authentication key file. when i execute this code:
srv= pysftp.Connection(host='54.172.33.121',username='xxx',password='xxx',private_key='c:\SFTPKey\hajjcoreit.ppk')
i get this error:
BadAuthenticationType: ('Bad authentication type', [u'publickey']) (allowed_types=[u'publickey'])
i can access the server through winSCP though.

Edits in your code
You probably have done something wrong with the hostname. As the proper syntax for pysftp is as
import pysftp
sftp = pysftp.Connection('hostname', username='me', password='secret')
#
# ... do sftp operations
#
sftp.close() # close your connection to hostname
so now this is what you do,
srv=pysftp.Connection('sftp.54.172.33.121',username='xxx',password='xxx',private_key='c:\SFTPKey\hajjcoreit.ppk')
so you won't get any error.Also cross check with the filezilla that the link, uid and password are correct.

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You might be able to poke at this by checking your SMTP connection from inside your Superset instance.
From where your Superset instance should be sending the emails, start a Python script and try:
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I am trying to connect to a PostgreSQL Database via ssh tunnel. It is set up to listen on port 3333 and forward to port 5432 on the machine with the database. I am able to connect using the psql command with password authentication via the tunnel, but for some reason when I attempt to connect using psycopg2 via the tunnel, I get the error FATAL: password authentication failed for user database_user. I have tried putting quotes around user names and passwords to no avail.
Successful psql command:
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Failed pscyopg2 command:
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Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/database_user/.local/share/virtualenvs/project-QNhT-Vzg/lib/python3.7/site-packages/psycopg2/__init__.py", line 126, in connect
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Here is part of my pg_hba.conf for reference:
# Database administrative login by Unix domain socket
local all postgres peer
# TYPE DATABASE USER ADDRESS METHOD
# "local" is for Unix domain socket connections only
local all all peer
# IPv4 local connections:
host all all 127.0.0.1/32 md5
# IPv6 local connections:
host all all ::1/128 md5
# Allow replication connections from localhost, by a user with the
# replication privilege.
local replication all peer
host replication all 127.0.0.1/32 md5
host replication all ::1/128 md5
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Networking: Firewall, NAT, Port Forwarding
PostgreSQL ACL
PostgreSQL login
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ACL issue will generally raise a typical: No pg_hba.conf entry for host <hostname>, user <username>, database <database> which means you did connect the PostgreSQL service but the connection is not referenced as valid in ACL;
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host all all 127.0.0.1/32 md5
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Reading your comment, it seems you may have ' quote in your password as well. So your password in your connection might be:
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How to connect to server with only username and public ssh key?

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I have tried
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