I have some byte arrays given to me from a Java API and I want to write it to a file via Jython. I thought it would as easy as:

jpg = open("pic.jpg","wb")
for b in bytes:
   jpg.write(b)
jpg.close()

But, of course, it’s not that easy:

Traceback (innermost last):
  File "getbinarydata.py", line 28, in ?
TypeError: write(): 1st arg can't be coerced to String

I ended up having to reach into the Java API thusly:

out = FileOutputStream(fname)
out.write(bytes)
out.close()

Which works, but I think I should be able to do this with “native” Jython calls. But Google shows me no love.