Paramiko

import paramiko
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy)
client.connect(hostname=hostname, user=user, password=password)

stdin, stdout, stderr = client.exec_command('ls')
stdout.read()

Class

import paramiko

class SSHCommand:
    def __init__(self, address, username, password):
        self.address = address
        self.username = username
        self.password = password
        self.client = paramiko.SSHClient()
        self.client.set_missing_host_key_policy(paramiko.AutoAddPolicy)
        self.client.connect(hostname=address, username=username, password=password)

    def execute(self, command):
        _, stdout, _ = self.client.exec_command(command)
        result = stdout.read()
        return result.decode("ascii")