What does #pragma once mean in C? [duplicate]

In the C and C++ programming languages, #pragma once is a non-standard but widely supported preprocessor directive designed to cause the current source file to be included only once in a single compilation. Thus, #pragma once serves the same purpose as #include guards, but with several advantages, including: less code, avoiding name clashes, and improved … Read more

socket.error: [Errno 48] Address already in use

You already have a process bound to the default port (8000). If you already ran the same module before, it is most likely that process still bound to the port. Try and locate the other process first: The command arguments are included, so you can spot the one running SimpleHTTPServer if more than one python process is active. You … Read more