which exception do you get when you os.write() to a pipe that has nothing reading it?

[Skaperen]

SIGPIPE happens when the read end is closed, not when there is just no read() call that is active (the file descriptor, when closed, is no longer there). i was originally confusing this distinction when i was doing the initial logic design of my current project being done in Python. this revealed to me that my memory about the system semantics was fuzzy, hence the idea to do some things in C, again, particularly, using Python to prototype some of those designs.