Use isort

[isort](https://isort.readthedocs.io/en/latest/) sorts your Python
imports so you don't have to. This makes sure that imports are always
where they should be and prevents issues like duplicated imports and
merge conflicts. Using pre-commit, this can be done automatically
without any manual steps.

Depends on #9.

.pre-commit-config.yaml

@@ -10,3 +10,15 @@ repos:
     rev: v1.3.0
     hooks:
       - id: trailing-whitespace
+
+  # Python import formatting
+  - repo: https://github.com/asottile/seed-isort-config
+    rev: v1.9.3
+    hooks:
+      - id: seed-isort-config
+
+  - repo: https://github.com/timothycrosley/isort
+    rev: 4.3.21-2
+    hooks:
+      - id: isort
+        additional_dependencies: ["toml"]

__init__.py

@@ -1,3 +1,4 @@
-import sys
 import os
+import sys
+
 sys.path.insert(0, os.path.abspath('.'))

lib/api_hooks.py

@@ -1,6 +1,8 @@
 #!/usr/bin/python
 import sys
+
 import requests
+
 # sys.path.insert(1, 'lib/')
 
 

lib/display.py

@@ -2,9 +2,10 @@
 import cgi
 import sys
 
-sys.path.insert(0, '../')
 from config import Config
 
+sys.path.insert(0, '../')
+
 
 class Frontend():
     """Dynamic frontend display functions"""

lib/storage.py

@@ -1,8 +1,10 @@
 #!/usr/bin/python
-import sys
 import sqlite3
+import sys
+
 # sys.path.insert(1, '../')
 from config import Config
+
 db_pointer = Config().catalogue_db
 
 

main.py

@@ -2,11 +2,10 @@
 import sys
 
 from config import Config
-from lib.library import Catalogue
-from lib.pyShelf import InitFiles
-from lib.pyShelf import BookServer
-from lib.pyShelf import BookDisplay
 from lib.display import Frontend
+from lib.library import Catalogue
+from lib.pyShelf import BookDisplay, BookServer, InitFiles
+
 # sys.path.insert(1, 'lib/')
 
 config = Config()  # Get configuration settings

pyproject.toml

@@ -0,0 +1,10 @@
+[tool.isort]
+force_grid_wrap = 0
+include_trailing_comma = true
+line_length = 88
+multi_line_output = 3
+use_parentheses = true
+# NOTE: the known_third_party setting is managed by
+# seed-isort-config and should not be modified directly.
+# Any changes made to this setting will be overwritten.
+known_third_party = ["PIL", "bs4", "requests"]

tests/__init__.py

@@ -1,2 +1,3 @@
 import sys
+
 sys.path.insert(1, '../lib/')

tests/test_bookserver.py

@@ -1,8 +1,9 @@
 import sys
 import unittest
 
-from lib.pyShelf import BookDisplay, BookServer
 from lib.display import Frontend
+from lib.pyShelf import BookDisplay, BookServer
+
 sys.path.insert(0, '../lib')
 sys.path.insert(1, '../')
 

tests/test_storage.py

@@ -1,5 +1,6 @@
-import unittest
 import sys
+import unittest
+
 # sys.path.insert(1, '../')
 from lib.storage import Storage