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# Module: `parallel.util`

Some generic utilities for dealing with classes, urls, and serialization.

## 2 Classes

class `IPython.parallel.util.``Namespace`

  Bases: `dict`

  Subclass of dict for attribute access to keys.

class `IPython.parallel.util.``ReverseDict`(*args, **kwargs)

  Bases: `dict`

  simple double-keyed subset of dict methods.

  `__init__`(*args, **kwargs)

## 16 Functions

`IPython.parallel.util.``log_errors`(f)

  decorator to log unhandled exceptions raised in a method.

  For use wrapping on_recv callbacks, so that exceptions do not cause the stream to be closed.

`IPython.parallel.util.``is_url`(url)

  boolean check for whether a string is a zmq url

`IPython.parallel.util.``validate_url`(url)

  validate a url for zeromq

`IPython.parallel.util.``validate_url_container`(container)

  validate a potentially nested collection of urls.

`IPython.parallel.util.``split_url`(url)

  split a zmq url (tcp://ip:port) into (‘tcp’,’ip’,’port’).

`IPython.parallel.util.``disambiguate_ip_address`(ip, location=None)

  turn multi-ip interfaces ‘0.0.0.0’ and ‘*’ into a connectable address

  Explicit IP addresses are returned unmodified.

  Parameters :

  ip : IP address

  > An IP address, or the special values 0.0.0.0, or *

  location: IP address, optional :

  > A public IP of the target machine. If location is an IP of the current machine, localhost will be returned, otherwise location will be returned.

`IPython.parallel.util.``disambiguate_url`(url, location=None)

  turn multi-ip interfaces ‘0.0.0.0’ and ‘*’ into connectable ones, based on the location (default interpretation is localhost).

  This is for zeromq urls, such as `tcp://*:10101`.

`IPython.parallel.util.``interactive`(f)

  decorator for making functions appear as interactively defined. This results in the function being linked to the user_ns as globals() instead of the module globals().

`IPython.parallel.util.``select_random_ports`(n)

  Selects and return n random ports that are available.

`IPython.parallel.util.``signal_children`(children)

  Relay interupt/term signals to children, for more solid process cleanup.

`IPython.parallel.util.``generate_exec_key`(keyfile)

`IPython.parallel.util.``integer_loglevel`(loglevel)

`IPython.parallel.util.``connect_logger`(logname, context, iface, root='ip', loglevel=10)

`IPython.parallel.util.``connect_engine_logger`(context, iface, engine, loglevel=10)

`IPython.parallel.util.``local_logger`(logname, loglevel=10)

`IPython.parallel.util.``set_hwm`(sock, hwm=0)

  set zmq High Water Mark on a socket

  in a way that always works for various pyzmq / libzmq versions.

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