rajasekhar1242 0 Light Poster

Hi friends,
I have developed a program with reportlabs module to generate a PDF file on macos x. The pdf file is generated successfully But, i cant open the pdf file automatically i mean manually i click on that file then it will be opened.
Also i used this syntax
"os.system("open"+'/Users/raj/Desktop')"
But there is no use. is there any alternate process. pls give me a valuable reply.