Question

When pycurl executes its perform() method,
does the Python script wait until it gets executed (WRITEFUNCTION) or python
immediately proceeds to the next line even if WRITEFUNCTION hasn’t been entered or hasn’t returned a result?
E.g.

curl.setopt(pycurl.WRITEFUNCTION, receive)
curl.perform()
some_call() # is this line immeditely executed? can I expect receive() has already exited?

Answer 1

pycurl is a wrapper around the C implementation (libcurl), and the C implementation calls its WRITEFUNCTION callback during the execution of it’s curl_easy_perform or curl_multi_perform functions (the equivalent of the pycurl perform).

So you can expect your callback to have finished executing before perform returns. i.e. You can expect some_call () to be executed after receive finishes.