further resolving URL redirects issue

web/app/book.py

 from .resources import *
 from werkzeug.exceptions import abort
 from . import db
+import os
 
 book = Blueprint('book', __name__)
 

web/app/create.py

 from .resources import *
 from werkzeug.exceptions import abort
 from . import db
+import os
 
 create = Blueprint('create', __name__)
 

web/app/practice.py

 from .resources import *
 from werkzeug.exceptions import abort
 from . import db
+import os
 
 practice = Blueprint('practice', __name__)
 

web/app/publisher.py

 from .resources import *
 from werkzeug.exceptions import abort
 from . import db
+import os
 
 publisher = Blueprint('publisher', __name__)
 

web/app/tool.py

 from .resources import *
 from werkzeug.exceptions import abort
 from . import db
+import os
 
 tool = Blueprint('tool', __name__)