Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 1433, in OnPouSelectedChanged
window.RefreshView()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 837, in RefreshView
self.RefreshProcessVariables()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 886, in RefreshProcessVariables
slaves = self.Controler.GetSlaves(**self.CurrentNodesFilter)
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/EthercatMaster.py", line 341, in GetSlaves
for slave in self.Config.getConfig().getSlave():
<type 'exceptions.AttributeError'>:_'lxml.etree._Element'_object_has_no_attribute_'getSlave'

Steps to reproduce problem:

- Add new EtherCAT master
- Add new EthercatNode to the master
- double click on


this is looks like dirty hack to fix strange problem with initial[0]
changing its type after returning from _init_ method to lxml.etree._Element
As a result all methods generated by class factory are lost.

For example, in function initMethod initial[0].__class__ points to
xmlclass.xmlclass.Config. After map(self.append, initial)
self.Config.__class__ is 'xmlclass.xmlclass.Config' as well.
But after returning from initMethod (_init) in CreateElement
self.Config.__class__ has changed to lxml.etree._Element.


I've noticed similar behavior if copy/deepcopy is used for any child
of etree.ElementBase. See simple example below.
[-------------------------------------------------------------]
#!/usr/bin/python

from __future__ import print_function
from lxml import etree
import copy

class DefaultElementClass(etree.ElementBase):
def getLocalTag(self):
return etree.QName(self.tag).localname


def printInformation(x):
print(x, x.__class__, "getLocalTag" in dir(x))


a = DefaultElementClass()
printInformation(a)

#
printInformation(copy.copy(a))
printInformation(copy.deepcopy(a))
[-------------------------------------------------------------]

     1

# SOME DESCRIPTIVE TITLE.

     2

# Copyright (C) is 21st century inquisition

     3

# This file is distributed under the same license as the Beremiz package.

     4

# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.

     5

#

     6

msgid ""

     7

msgstr ""

     8

"Project-Id-Version: Beremiz 1.1\n"

     9

"Report-Msgid-Bugs-To: \n"

    10

"POT-Creation-Date: 2012-09-08 00:41\n"

    11

"PO-Revision-Date: 2012-09-07 11:18+0100\n"

    12

"Last-Translator: \n"

    13

"Language-Team: \n"

    14

"Language: \n"

    15

"MIME-Version: 1.0\n"

    16

"Content-Type: text/plain; charset=UTF-8\n"

    17

"Content-Transfer-Encoding: 8bit\n"

    18

"X-Poedit-Language: French\n"

    19

"X-Poedit-Country: FRANCE\n"

    20

"X-Poedit-SourceCharset: utf-8\n"

    21

    22

# b82e66796943449ea9e01b02ddcd12ca

    23

#: ../../overview.rst:2

    24

msgid "Project overview"

    25

msgstr "Vue d'ensemble sur le projet"

    26

    27

# 32289df91d6b4cdeb2c54604118bfc69

    28

#: ../../overview.rst:4

    29

msgid ""

    30

"In order to target the widest possible range of programmable devices and "

    31

"keep efficient, Beremiz use C code as an intermediate language."

    32

msgstr ""

    33

"Dans le but de viser la plus grande variété de dispositifs programmables "

    34

"tout en restant efficace, Beremiz utilise le C comme langage intermédiaire."

    35

    36

# 6abccf881e4e478987befa2e9ce5a9ce

    37

#: ../../overview.rst:6

    38

msgid ""

    39

"To be executed, C needs to be compiled. `GCC <http://gcc.gnu.org>`_ serve "

    40

"that purpose perfectly."

    41

msgstr ""

    42

"Afin de pouvoir être exécuté le C doit être compilé. Le `GCC <http://gcc.gnu."

    43

"org>`_ rempli cette fonction parfaitement. "

    44

    45

# 5057a1dfe63a475981bad9028c8e3be8

    46

#: ../../overview.rst:8

    47

msgid ""

    48

"PLC program is expressed in languages defined in IEC-61131, including "

    49

"graphical languages. Thanks to PLCopen TC2, those graphical languages have a "

    50

"standardised representation, in XML."

    51

msgstr ""

    52

"Les programmes destinés au automates programmables sont exprimés dans les "

    53

"langages définis par la norme IEC-61131, incluant des langages graphiques. "

    54

"Thanks to PLCopen TC2, those graphical languages have a standardised "

    55

"representation, in XML."

    56

    57

# a6318fafe7b948a2b59e153b23de51f2

    58

#: ../../overview.rst:10

    59

msgid "To be continued."

    60

msgstr ""