What is an easy way to implement fprintf in python?

Question

In python, the following will let us write to stdout:

import sys
sys.stdout.write("blah %d" % 5)

However, I want to be flexible about which stream we print to. I want to pass the stream as an argument into a function, as you would when calling fprintf in any of C derived languages. In the snippet of source code above, stdout is hard-coded into the write-statement. However, we want to be flexible about which stream we write to. we might want stderr, or some other stream instead of stdout.

Answer 1

You say

I want to pass the stream as an argument into a function

but that doesn't give you any extra flexibility. If you have a some_stream variable referring to the stream you want to write to, you can already do

some_stream.write("blah %d" % 5)

so you don't gain anything by making the stream a function argument. That said, the print function takes a file argument specifying what stream to write to:

print("blah %d" % 5, end='', file=some_stream)