title: Python FTP filename invalid error
body: <p>I'm trying to upload a file using ftp in python, but I get an error saying:</p>
  
  <pre><code>ftplib.error_perm: 550 Filename invalid
  </code></pre>
  
  <p>when I run the following code:</p>
  
  <pre><code>ftp = FTP('xxx.xxx.x.xxx', 'MY_FTP', '')
  ftp.cwd("/incoming")
  file = open('c:\Automation\FTP_Files\MaxErrors1.json', 'rb')
  ftp.storbinary('STOR c:\Automation\FTP_Files\MaxErrors1.json', file)
  ftp.close()
  </code></pre>
  
  <p>I've checked that the file exists in the location I specified, does anyone know what might be causing the issue?</p>