Only use relative imports for functions in the same package.

app/admin/forms.py

+from app.models import Role, User
 from flask_wtf import FlaskForm
 from wtforms import (BooleanField, SelectField, StringField, SubmitField,
                      ValidationError)
 from wtforms.validators import DataRequired, Email, Length, Regexp
-from ..models import Role, User
 
 
 class EditProfileAdminForm(FlaskForm):

app/admin/views.py

+from app import db
+from app.decorators import admin_required
+from app.models import Role, User
+from app.tables import AdminUserItem, AdminUserTable
 from app.utils import background_delete_user
 from flask import current_app, flash, redirect, render_template, url_for
 from flask_login import login_required
 from . import admin
 from .forms import EditProfileAdminForm
-from .. import db
-from ..decorators import admin_required
-from ..models import Role, User
-from ..tables import AdminUserTable, AdminUserItem
 import threading
 
 

app/auth/forms.py

+from app.models import User
 from flask_wtf import FlaskForm
 from wtforms import (BooleanField, PasswordField, StringField, SubmitField,
                      ValidationError)
 from wtforms.validators import DataRequired, Email, EqualTo, Length, Regexp
-from ..models import User
 
 
 class LoginForm(FlaskForm):

app/auth/views.py

+from app import db
+from app.email import send_email
+from app.models import User
 from flask import flash, redirect, render_template, request, url_for
 from flask_login import current_user, login_required, login_user, logout_user
 from . import auth
 from .forms import (LoginForm, PasswordResetForm, PasswordResetRequestForm,
                     RegistrationForm)
-from .. import db
-from ..email import send_email
-from ..models import User
 
 
 @auth.route('/login', methods=['GET', 'POST'])

app/corpora/views.py

+from app import db
+from app.models import Corpus, CorpusFile
 from app.utils import background_prepare_corpus_file
 from flask import (abort, current_app, flash, redirect, request,
                    render_template, url_for, send_from_directory)
 from flask_login import current_user, login_required
+from werkzeug.utils import secure_filename
 from . import corpora
 from .forms import (AddCorpusFileForm, AddCorpusForm, EditCorpusFileForm,
                     QueryDownloadForm, QueryForm)
-from .. import db
-from ..models import Corpus, CorpusFile
-from werkzeug.utils import secure_filename
 import os
 import threading
 import logging