Python을 사용하여 SFTP를 통해 파일을 안전하게 전송하는 방법은 무엇입니까?

<code class="python">import paramiko

# Host, port and user information (hard-coded)
host = "THEHOST.com"
port = 22
username = "THEUSERNAME"
password = "THEPASSWORD"

# Establish an SSH and SFTP connection
transport = paramiko.Transport((host, port))
transport.connect(username=username, password=password)
sftp = paramiko.SFTPClient.from_transport(transport)

# Define remote and local file paths (hard-coded)
remote_path = './THETARGETDIRECTORY/' + file
local_path = file

# Upload the file
sftp.put(local_path, remote_path)

# Close file and transport connections
sftp.close()
transport.close()

print("Upload complete.")</code>