server_activate() Called by the server’s constructor to activate the server. The default behavior for a TCP server just invokes listen() on the server’s socket. May be overridden.

os._exit(n) Exit the process with status n, without calling cleanup handlers, flushing stdio buffers, etc. Note The standard way to exit is sys.exit(n). _exit() should normally only be used in the child process after a fork().

math.isnan(x) Return True if x is a NaN (not a number), and False otherwise.

DocumentType.internalSubset A string giving the complete internal subset from the document. This does not include the brackets which enclose the subset. If the document has no internal subset, this should be None.

info() Return the “protected” _info variable.

turtle.bk(distance) turtle.backward(distance) Parameters: distance – a number Move the turtle backward by distance, opposite to the direction the turtle is headed. Do not change the turtle’s heading. >>> turtle.position() (0.00,0.00) >>> turtle.backward(30) >>> turtle.position() (-30.00,0.00)

error_status The HTTP status used for error responses. This should be a status string as defined in PEP 3333; it defaults to a 500 code and message.

isatty() Returns False.

st_uid User identifier of the file owner.

window.attroff(attr) Remove attribute attr from the “background” set applied to all writes to the current window.