Module util

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This file contains general-purpose utilities, mainly Python Cookbook recipes.

Classes

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Borg
*Python Cookbook recipe 6.16* Borg implementation

GenericWrapper

Proxy

IList
Proxy class for list objects that enables breaking the elements iteration if the condition flag (sentinel) is set to False during this process All the other operations are delegated to the list object itself #note: the same functionality could be achieved by extending list object #and overriding the __iter__() method but unfortunately this is not exposed in Python2.2 #TODO: review this implementation in a more OO way when min Python version in Ganga is 2.3

Functions

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empty_obj(klass)

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empty_class(klass)

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unique(s)
Return a list of elements in s in arbitrary order, but without duplicates.

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canLoopOver(maybeIterable)

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isStringLike(obj)

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containsGangaObjects(obj)
Recursive call to find GangaObjects

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isNestedList(obj)

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execute_once()
Return True if this function was not yet executed from a certain line in the program code.

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hostname()
Try to get the hostname in the most possible reliable way as described in the Python LibRef.

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setAttributesFromDict(d, prefix=None)
*Python Cookbook recipe 6.18* Helper function to automatically initialises instance variables from __init_ arguments.

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wrap_callable(any_callable, before, after)

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wrap_callable_filter(any_callable, before, after)

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make_binder(unbounded_method)

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proxy(obj, *specials)

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importName(modulename, name)

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Variables

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__executed_frames = {}

known_proxy_classes = {}

__package__ = None
hash(x)

Function Details

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execute_once()

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Return True if this function was not yet executed from a certain line in the program code.
Example:
 execute_once() # -> True
 execute_once() # -> True

 for i in range(2):
  execute_once() # -> True (1st), False (2nd)

 if execute_once() and execute_once():  # -> False