A temp file can print by using
subprocess.run(["lp", "-d", "<printer>", tmp])
But is it possible to print a bytes string representing a ReportLab generated pdf?
buffer = BytesIO()
c = canvas.Canvas(buffer)
c.drawString(100, 100, "Hello World")
c.showPage()
c.save()
pdf = buffer.getvalue()
lpr = subprocess.Popen("/usr/bin/lpr", stdin=subprocess.PIPE)
lpr.stdin.write(pdf)
buffer.close()
This code starts a print job but with a size of 0k and a status of Held.
I guess you are missing a lpr.communicate() call, compare with: Understanding Popen.communicate
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