import bpy
import pathlib
 
 
def f():
    destfolder = pathlib.Path("C:\\Users\\username\\Desktop")
    if not destfolder.exists():
        raise Exception("ディレクトリが見つからない。.\n%s" % destfolder)
 
    sce = bpy.data.scenes['Scene']
    for ob in sce.objects:
        bpy.ops.object.select_pattern(pattern=ob.name)
        file_name = pathlib.Path(ob.name).with_suffix(".obj")
        file_path = destfolder.joinpath(file_name)
        bpy.ops.export_scene.obj(filepath=str(file_path), use_selection=True)
 
 
try:
    f()
except:
    import traceback
    import sys
    traceback.print_exc()
    ei = sys.exc_info()
 
    def draw(self, context):
        layout = self.layout
        for i in str(ei[1]).split("\n"):
            row = layout.row()
            row.label(text=i)
    bpy.context.window_manager.popup_menu(draw, title="Error", icon="ERROR")
 

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