Loop/zoom to features in a feature class and save as jpg

SaveFeaturesToJpeg.py

import arcpy, os  
  
def getLayerOnName(mxd, lyr_name):  
    for lyr in arcpy.mapping.ListLayers(mxd):  
        if lyr.name.upper() == lyr_name.upper():  
            return lyr  
            break  
  
# some settings and variables  
mxd_path = "CURRENT" # or use a path to the mxd file  
df_name = "Layers"  
lyr_name = "Grid"  
fld_id = "FID" # "Name of the field that has a unique number for the output files"  
jpg_folder = r"C:\Temp"  
jpg_prefix = "Map_"  
show_only_current_polygon = True  
  
mxd = arcpy.mapping.MapDocument(mxd_path)  
df = arcpy.mapping.ListDataFrames(mxd, df_name)[0]  
lyr = getLayerOnName(mxd, lyr_name)  
lyr_ds = lyr.dataSource  
  
# loop through all features  
flds = ("SHAPE@", fld_id)  
with arcpy.da.SearchCursor(lyr_ds, flds) as curs:  
    for row in curs:  
        pol_ext = row[0].extent  
        pol_id = row[1]  
  
        # set a whereclause  
        if show_only_current_polygon:  
            wc = "{0} = {1}".format(arcpy.AddFieldDelimiters(lyr_ds, fld_id), pol_id)  
            lyr.definitionQuery = wc  
  
        df.extent = pol_ext  
        jpg_name = "{0}{1}.jpg".format(jpg_prefix, pol_id)  
        jpg_path = os.path.join(jpg_folder, jpg_name)  
        arcpy.mapping.ExportToJPEG(mxd, jpg_path, df, df_export_width=3004,  
                                   df_export_height=2125, world_file=True)  
  
        print "Exported: {0}".format(jpg_name)