title: Use subprocess to send a password
body: <p>I'm attempting to use the python subprocess module to log in to a secure ftp site and then grab a file. However I keep getting hung up on just trying to send the password when it is requested. I so far have the following code:</p>
  
  <pre><code>from subprocess import Popen, PIPE
  
  proc = Popen(['sftp','user@server', 'stop'], stdin=PIPE)
  proc.communicate('password')
  </code></pre>
  
  <p>This still stops at the password prompt. If I enter the password manually it then goes to the ftp site and then enters the password on the command line. I've seen people suggest using pexpect but long story short I need a standard library solution. Is there anyway with subprocess and/or any other stdlib? What am I forgetting above?</p>