Added comments, fixed small issues, removed a few redundancies. Added run.bat.

Library.py

@@ -1,20 +1,22 @@
 import tkinter as tk
-from tkinter import ttk
 from buttonfade import buttonfade 
-#from Requests import search, image
 from request_api import request_api
 import requests
 from io import BytesIO
 from PIL import Image, ImageTk
 
+# request_api class from request_api.py instantiated to use its api features inside this program.
 rq = request_api()
 
 class BookSelection():
-
+    # Initialized with 0, the first book in the list (0).
     def __init__(self):
         self.x = 0
         #self.imageisbn = None
 
+    # When search button pressed the method starts from 0 to allow for multiple searches during program use without conflict.
+    # Initializes self.image_frame() and self.text_configuration() methods to process data for GUI. 
+    # Then runs through forloop in range of return_isbn() list range to fill right side of GUI with ISBN numbers.
     def on_searchbutton(self):
         self.x = 0
         searchbar_input = searchbar.get()
@@ -26,13 +28,15 @@ class BookSelection():
         
     def text_configuration(self):
         try:
-                resulttext.config(text=(
+                resulttext.config(
+                     text=(
                             	          f"{rq.Booktitle}" + "\n" 
                                         + f"{rq.Bookauthor}" + "\n"
                                         + f"{rq.Bookisbn[self.x]}" + "\n"
                                         + f"{rq.Bookdate[self.x]}" + "\n"
                                     )
                                 )
+        # If out of bounds start at position 0 and reinitialize.        
         except UnboundLocalError:
             self.x = len(rq.return_isbn())
             imageisbn = (rq.return_isbn(self.x))
@@ -40,6 +44,7 @@ class BookSelection():
             self.text_configuration()
             self.image_frame(imageisbn)
 
+        # If IndexError (like out of bounds but went backwards) start at position 0 and reinitialize.
         except IndexError:
             self.x = 0
             imageisbn = (rq.return_isbn(self.x))
@@ -47,19 +52,20 @@ class BookSelection():
             self.image_frame(imageisbn)
 
     def image_frame(self, imageisbn=None):
-        global photo
+        # Assign image url to variable. Then get image url through requests module.
+        # Decode output through BytesIO module. Open decoded image data through Image module.
+        # Create an object of opened decoded image through ImageTK module. Configure Imagelabel
+        # to use it through .config method parameter assignment and then assign imagelabel.image method as = img.
+        # This method is solely responsible for 3 module implementations.
         imager = rq.out_image(imageisbn)
         response = requests.get(imager)
         img_data = BytesIO(response.content)
-
         photo = Image.open(img_data)
-
         img = ImageTk.PhotoImage(photo)
-        
         imagelabel.config(image=img)
-
         imagelabel.image = img
 
+    # Button functionality made to be called by tkinter GUI buttons.
     def on_leftright_button(self, direction):
         internal_direction = direction
         if internal_direction == "left":
@@ -71,12 +77,15 @@ class BookSelection():
         self.image_frame(imageisbn)
         self.text_configuration()
 
+# If __name__ == "__main__" - Only runs when run directly (not through import).
 if __name__ == "__main__":
+
+    # Instantiates BookSelection Class for button usage.
     BS = BookSelection()
 
 
     main = tk.Tk()
-    main.geometry("600x600")
+    main.geometry("600x800")
     main.minsize(600, 800)
     main.maxsize(600, 800)
     main.title("Book Finder")
@@ -99,7 +108,7 @@ if __name__ == "__main__":
     imagelabel = tk.Label(main)
     imagelabel.grid(row=1, column=0, columnspan=2, sticky="nesw")
 
-
+    # Button usage is here. 3 Buttons.
     searchbutton = tk.Button(main, text="Search", command=BS.on_searchbutton)
     searchbutton.grid(row=2, column=2, sticky="nsew", pady=(40,0))
     buttonleft = tk.Button(main, text="forward", command=lambda: BS.on_leftright_button("left"))
@@ -112,12 +121,15 @@ if __name__ == "__main__":
     canvas = tk.Canvas(main)
     canvas.grid(row=1, column=2, sticky="nsew")
 
+    # Failed attempts at adding scrollbar functionality to ISBN-Book list on the right.
     #scrollbar = tk.Scrollbar(main, orient=tk.VERTICAL, command=canvas.yview)
     #scrollbar.grid(row=1, column=2, sticky="nsw")
     #
     #canvas.configure(yscrollcommand=scrollbar.set)
     #canvas.bind('<Configure>', lambda e: canvas.configure(scrollregion = canvas.bbox("all")))
     #
+    
+    # Seperate canvas for Book image stretched to all four direction by sticky.
     frame_two = tk.Frame(canvas)
     frame_two.grid(sticky="nsew")
 

buttonfade.py

@@ -1,5 +1,7 @@
 import tkinter as tk
 
+# This buttonfade class was implemented soly for it's function of giving placeholder-text in the searchbar
+# which disappears when clicked into. (User-Friendly design).
 class buttonfade(tk.Entry):
     def __init__(self, master=None, placeholder="Search Here", *args, **kwargs):
         super().__init__(master, *args, **kwargs)

request_api.py

@@ -1,5 +1,8 @@
 import requests as rq 
 
+# Request_api class made for import in the Library.py file. Seperate for better overview.
+# Class intializes five parameters first to then have them assigned by requests get method.
+# Requests are made to openlibrary, because they support api calls.
 
 class request_api():
     
@@ -27,13 +30,16 @@ class request_api():
         self.Bookisbn = Bookinfo.get('isbn')
         self.Bookdate = Bookinfo.get('publish_date')
 
-
+    # Return methods implemented for standardized retrieval of selected book properties.
+    # Also for easy implementation of the next and previous book buttons while searching.
     def return_title(self, x):
         return self.Booktitle[x]
 
     def return_author(self, x):
         return self.Bookauthor[x]
 
+    # If x (place in gotten book que) is None (after search) return entire list.
+    # If IndexError (clicked next past que list) then return to first (zero) book entry in list.
     def return_isbn(self, x = None):
         try:
             if x != None:
@@ -46,12 +52,14 @@ class request_api():
     def return_date(self, x):
         return self.Bookdate[x]
 
+    # If "Imageisbn = None" (after search) - set imageisbn to bookisbn of 0
     def out_image(self, imageisbn=None):
         if imageisbn is None:
             imageisbn = self.Bookisbn[0]    
         image_output = f'https://covers.openlibrary.org/b/isbn/{imageisbn}-L.jpg'
         return image_output
 
+    # Small-Image functionality - not yet implemented.
     def out_image_small(self, imageisbn=None):
         if imageisbn is None:
             imageisbn = self.Bookisbn[0]    

run.bat

@@ -0,0 +1,4 @@
+@echo off 
+echo "starting"
+python "Library.py"
+pause