如何在Django中的大型描述中设置“查看更多”选项？

i am working in django platform using python language. i am showing results in my template file in which i have large description to display. All i want to know is How can we set "see more" option on large Descriptions if text exceeded from 4 lines. and after 4 lines there will be "see more" option appears. just like Facebook long status. and on clicking "see more" option i want to show my whole description. i am new to django help will be appreciated.i am working in django platform using python la