title: how to use zlp2 for installing a module in odoo9
body: <p>i want to install module printer_zpl2 but it shows the error "NameError: name 'zpl2' is not defined" .</p>
  
  <p>My question is how to get or download or install "zpl2" ??
  i have executed the command "pip install zpl2" but nothing change . Any help please </p>