import sys
import os
import math
import csv
import EnvSettings

from osgeo import osr

import os
path = os.environ['PATH']
pgdal= 'C:\OSGeo4W64\share\gdal;'
os.environ['GDAL_DATA']='C:\OSGeo4W64\share\gdal'
os.environ['GDAL_DRIVER_PATH']='C:\OSGeo4W64\share\gdal\gdalplugins'
os.environ['PROJ_LIB']='C:\OSGeo4W64\share\gdal\projlib'
os.environ['PATH'] = "%s;%s" % (pgdal, path)

import os
path = os.environ['PATH']
pgdal= 'C:\OSGeo4W\share\gdal;'
os.environ['GDAL_DATA']='C:\OSGeo4W\share\gdal'
os.environ['GDAL_DRIVER_PATH']='C:\OSGeo4W\share\gdal\gdalplugins'
os.environ['PROJ_LIB']='C:\OSGeo4W\share\gdal\projlib'
os.environ['PATH'] = "%s;%s" % (pgdal, path)

Traceback (most recent call last):
  File "ols_engine.py", line 5, in <module>
    import mdl
  File "C:OSGeo4WPyPackv0.2_cells_opmdl.py", line 8, in <module>
    from osgeo import osr
  File "C:OSGeo4WappsPython27libsite-packagesosgeo__init__.py", line 21, in <module>
    _gdal = swig_import_helper()
  File "C:OSGeo4WappsPython27libsite-packagesosgeo__init__.py", line 17, in swig_import_helper
    _mod = imp.load_module('_gdal', fp, pathname, description)
ImportError: DLL load failed: The specified module could not be found.