Le portail francophone de la géomatique

import glob, os, shutil, arcpy
space = r'#'
nom = os.path.basename(space)
mxd = arcpy.mapping.MapDocument("CURRENT")
df = arcpy.mapping.ListDataFrames(mxd)[0]
code_block3= """# coding: utf8
def libel(lib,txt):
     num= txt.split('ER')
     if txt.find('ER')!=-1 and txt[-1].isdigit() is True:
      return u'Emplacement réservé' + num[-1]
     else:
      return lib"""
arcpy.AddMessage("Calcul des champs DATVALID & IDURBA")
for lay in df:
    fieldnames = [field.name for field in arcpy.ListFields(lay)]
    while 'LIBELLE' and 'TXT' in fieldnames:
        arcpy.CalculateField_management(lay, u'LIBELLE', 'libel(!LIBELLE!, !TXT!)',"PYTHON_9.3", code_block3)
        break