The blender python api website includes several tutorials to learn using python in blender. You can find details of the obj importer and exporter options. The obj import/export is handled by a python addon that is included with blender.

You could start with something as simple as -

import bpy,os
for f in os.listdir('/path/to/use'):
    bpy.ops.import_scene.obj(filepath=f)
    bpy.ops.export_scene.obj(filepath=f,use_materials=False)

If you need more help, blender has it's own SE site that is better for blender specific scripting.

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