export_obj.py

import bpy

animation_name = "run"
export_path = "/home/fabio/mData/projects/ps1-dev/psyq/projects/demo/data/chars/char1/"

frames_to_export = [0, 10, 20, 30, 40]

export_counter = 0

if not bpy.data.actions.get(animation_name):
    print(f"animation '{animation_name}' not found!")
else:
    action = bpy.data.actions[animation_name]

    # apply animation to the object
    for obj in bpy.context.scene.objects:
        if obj.animation_data:
            obj.animation_data.action = action

    for frame in frames_to_export:
        bpy.context.scene.frame_set(frame)
        
        file_name = f"{animation_name}{export_counter}.obj"
        full_path = export_path + file_name
        
        bpy.ops.export_scene.obj(
            filepath=full_path,
            use_selection=True,
            use_mesh_modifiers=True,
            use_uvs=True,
            axis_forward='Z',
            axis_up='-Y',
            use_materials=False,
            use_edges=False,
            use_normals=False,
            use_vertex_groups=False,
            use_smooth_groups=False,
            use_smooth_groups_bitflags=False,
            use_triangles=False,
            use_nurbs=False,
            group_by_object=False,
            group_by_material=False
        )
        
        print(f"Exported file: {file_name}")
        export_counter += 1

    bpy.context.scene.frame_set(0)
    print("Export success!")