How to ssh connect through python Paramiko with ppk public key

Ok @Adam and @Kimvais were right, Paramiko cannot parse .ppk files.

So the way to go (thanks to @JimB too) is to convert .ppk file to OpenSSH private key format; this can be achieved using PuTTYgen as described here.

Then it's very simple getting connected with it:

import paramiko
ssh = paramiko.SSHClient()

ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

ssh.connect('<hostname>', username='<username>', password='<password>', key_filename='<path/to/openssh-private-key-file>')

stdin, stdout, stderr = ssh.exec_command('ls')
print stdout.readlines()
ssh.close()

For me I doing this:

import paramiko
hostname = 'my hostname or IP' 
myuser   = 'the user to ssh connect'
mySSHK   = '/path/to/sshkey.pub'
sshcon   = paramiko.SSHClient()  # will create the object
sshcon.set_missing_host_key_policy(paramiko.AutoAddPolicy()) # no known_hosts error
sshcon.connect(hostname, username=myuser, key_filename=mySSHK) # no passwd needed

works for me pretty ok

To create a valid DSA format private key supported by Paramiko in Puttygen.

Click on Conversions then Export OpenSSH Key