python web script send job to printer

Is it possible for my python web app to provide an开发者_如何学Python option the for user to automatically send jobs to the locally connected printer? Or will the user always have to use the browser to manually print out everything.

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If your Python webapp is running inside a browser on the client machine, I don't see any other way than manually for the user.

Some workarounds you might want to investigate:

• if you web app is installed on the client machine, you will be able to connect directly to the printer, as you have access to the underlying OS system.
• you could potentially create a plugin that can be installed on the browser that does this for him, but I have no clue as how this works technically.
• what is it that you want to print ? You could generate a pdf that contains everything that the user needs to print, in one go ?

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You can serve to the user's browser a webpage that includes the necessary Javascript code to perform the printing if the user clicks to request it, as shown for example here (a pretty dated article, but the key idea of using Javascript to call window.print has not changed, and the article has some useful suggestions, e.g. on making a printer-friendly page; you can locate lots of other articles mentioning window.print with a web search, if you wish).

Calling window.print (from the Javascript part of the page that your Python server-side code will serve) will actually (in all browsers/OSs I know) bring up a print dialog, so the user gets system-appropriate options (picking a printer if he has several, maybe saving as PDF instead of doing an actual print if his system supports that, etc, etc).