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# Name: ImportCADandMerge.py
  
 # Description: Imports and merges polylines from one workspace into a single feature class
 # Author: ESRI
 # Import system modules
import arcpy 
from arcpy import env
env.workspace = "G:/Expert/03_DGST/Poubelle/DAO"
 # Create a value table that will hold the input feature classes for Merge
vTab = arcpy.ValueTable()
 # Step through each dataset in the list
for fd in arcpy.ListDatasets("*", "CAD"):
     layername = fd + "_Layer"
     # Select only the Polyine features on the drawing layer R-EPIC-CANA
     arcpy.MakeFeatureLayer_management(fd + "/Polyline", layername, "\"Layer\" = 'R-EPIC-CANA'")
     vTab.addRow(layername)
 # Merge the CAD features into one feature class
arcpy.Merge_management(vTab, "G:/Expert/03_DGST/Poubelle/DAO.mdb/EPIC")

#!/usr/bin/env python
# -*- coding: UTF-8 -*-
"""
Name: ImportCADandMerge.py

Description: Imports and merges polylines
             from one workspace into a single feature class
Author: ESRI
"""
# Import system modules
import arcpy

#-------------------------------------------------------------------------------
# MAIN
#-------------------------------------------------------------------------------
def main():
    """
    Main du module : importe un calque de plusieurs DWG
                    dans une classe d'entites d'une FGDB (elle doit exister)
    """
    # Ecrase la classe d'entites cible si elle existe
    arcpy.env.overwriteOutput = True

    #Espace de travail ou sont les fichiers DWG
    arcpy.env.workspace = r'D:\Personnel\georezo\Python\ImportCADandMerge\DWG'

    # Create a value table that will hold the input feature classes for Merge
    vtab = arcpy.ValueTable()

    # WhereClause : calque DWG que l'on veut importer
    whereclause = "\"Layer\" = 'BATDUR'"

    # Step through each dataset in the list
    for fdataset in arcpy.ListDatasets('*.dwg'):
        layername = '{0}_Layer'.format(fdataset)
##        print '_{0}_'.format(layername)

        # Select only the Polyine features on the drawing layer (whereclause)
        arcpy.MakeFeatureLayer_management(r'{0}\Polyline'.format(fdataset)
                                          , layername
                                          , whereclause)
        vtab.addRow(layername)

    # Merge the CAD features into one feature class
    mergefc = r'D:\Personnel\georezo\Python\ImportCADandMerge\DAO.gdb\ImportCAD'
    arcpy.Merge_management(vtab, mergefc)

    return True

if __name__ == '__main__':
    STATUS = main()

#===============================================================================

        print '_{0}_'.format(layername)

layername = layername.replace(' +', 'plus')

#!/usr/bin/env python
# -*- coding: UTF-8 -*-
"""
Name: ImportCADandMerge.py

Description: Imports and merges polylines
             from one workspace into a single feature class
Author: ESRI
"""
# Import system modules
import arcpy

#-------------------------------------------------------------------------------
# MAIN
#-------------------------------------------------------------------------------
def main():
    """
    Main du module : importe un calque de plusieurs DWG
                    dans une classe d'entites d'une FGDB (elle doit exister)
    """
    # Ecrase la classe d'entites cible si elle existe
    arcpy.env.overwriteOutput = True

    #Espace de travail ou sont les fichiers DWG
    arcpy.env.workspace = r'D:\Personnel\georezo\Python\ImportCADandMerge\DWG'

    # Create a value table that will hold the input feature classes for Merge
    vtab = arcpy.ValueTable()

    # WhereClause : calque DWG que l'on veut importer
    whereclause = "\"Layer\" = 'water_distribution_lines'"

    nbfiledwg = 0
    # Step through each dataset in the list
    for fdataset in arcpy.ListDatasets('*.dwg'):
##        layername = '{0}_Layer'.format(fdataset)
##        layername = layername.replace(' +', 'plus')
        layername = 'dwg_{0}_Layer'.format(nbfiledwg)
##        print '_{0}_'.format(layername)

        # Select only the Polyine features on the drawing layer (whereclause)
        arcpy.MakeFeatureLayer_management(r'{0}\Polyline'.format(fdataset)
                                          , layername
                                          , whereclause)
        vtab.addRow(layername)
        nbfiledwg = nbfiledwg +1

    # Merge the CAD features into one feature class
    mergefc = r'D:\Personnel\georezo\Python\ImportCADandMerge\DAO.gdb\ImportCAD'
    arcpy.Merge_management(vtab, mergefc)

    #fin
    print '{0} fichiers DWG importes'.format(nbfiledwg)

    return True

if __name__ == '__main__':
    STATUS = main()

#===============================================================================

Python 2.6.5 
#!/usr/bin/env python
# -*- coding: UTF-8 -*-
"""
Name: ImportCADandMerge.py

Description: Imports and merges polylines
             from one workspace into a single feature class
Author: ESRI
"""
# Import system modules
import arcpy

#-------------------------------------------------------------------------------
# MAIN
#-------------------------------------------------------------------------------
def main():
    """
    Main du module : importe un calque de plusieurs DWG
                    dans une classe d'entites d'une FGDB (elle doit exister)
    """
    # Ecrase la classe d'entites cible si elle existe
    arcpy.env.overwriteOutput = True

    #Espace de travail ou sont les fichiers DWG
    arcpy.env.workspace = r'G:\Expert\03_DGST\Poubelle\DAO'

    # Create a value table that will hold the input feature classes for Merge
    vtab = arcpy.ValueTable()

    # WhereClause : calque DWG que l'on veut importer
    whereclause = "\"Layer\" = 'R-EPIC-CANA'"

    nbfiledwg = 0
    # Step through each dataset in the list
    for fdataset in arcpy.ListDatasets('*.dwg'):
        layername = u'{0}_Layer'.format(fdataset)
        layername = layername.replace(' -', 'moins')
        layername = layername.replace(' +', 'plus')
        layername = layername.replace(' ','-')
        print u'_{0}_'.format(layername)

    # Select only the Polyine features on the drawing layer (whereclause)
        arcpy.MakeFeatureLayer_management(u'{0}\Polyline'.format(fdataset)
                                          , layername
                                          , whereclause)
        vtab.addRow(layername)
        nbfiledwg = nbfiledwg +1
       
    # Merge the CAD features into one feature class
    mergefc = u'G:/Expert/03_DGST/Poubelle/DAO.gdb/EPIC'
    arcpy.Merge_management(vtab, mergefc)

    #fin
    print u'{0} fichiers DWG importes'.format(nbfiledwg)

    return True

if __name__ == '__main__':
    main()

#===============================================================================