How to perform SCP file transfers in Python using Paramiko?

Pythonic SCP File Transfer with SSH

Question:

How can I perform SCP file transfers in Python using a clean and efficient approach? The os.system() method is a hack and doesn't work cross-platform or handle passwordless SSH.

Paramiko SCP Module:

Paramiko provides an excellent Python module specifically designed for SCP transfers: the paramiko.scp.SCPClient. It offers a user-friendly interface for secure operations.

Example Usage:

<code class="python">import paramiko
from scp import SCPClient

# Establish SSH Connection
ssh = createSSHClient(server, port, user, password)

# Initialize SCP Client
scp = SCPClient(ssh.get_transport())

# SCP Operations
scp.get('/etc/local/filename', '/etc/remote/filename')  # Server to Local
scp.put('/etc/local/filename', '/etc/remote/filename')  # Local to Server</code>

Key Management:

The createSSHClient() function supports key management through the load_system_host_keys() and set_missing_host_key_policy() methods. Additionally, the SCPClient() constructor allows specifying the key file path or using system keys:

<code class="python"># Use System Keys
client = scp.Client(host=host, user=user, keyfile=keyfile)

# Use Password
client = scp.Client(host=host, user=user, password=password)</code>

Benefits:

• Cross-platform support
• Clean and structured interface
• Supports key management
• No need to implement SCP yourself

This approach provides a robust and customizable solution for seamless SCP file transfers in Python.

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