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diff --git a/Library management system/Bill.py b/Library management system/Bill.py
new file mode 100644
index 0000000..4bd6728
--- /dev/null
+++ b/Library management system/Bill.py	
@@ -0,0 +1,36 @@
+import borrow
+
+# creating Bill function 
+def Bill(f_name,sum,today,current_time):
+     print(borrow.borrowedBooks)
+     sum = "{:.2f}".format(sum)
+     print("\n"+"++" * 30)
+     print("Customer Bill!!!".center(50)+ "\n" + "++" * 30 + "\n")
+     print("Name of Customer: ",f_name)
+     print("Sum is $",sum)
+     print("Date and Time of Borrow is: ",today,current_time)
+     print("Name of Books Borrowed: ")
+     
+     for i in(borrow.borrowedBooks):
+         print(i)
+     x=current_time.replace(":","")
+     fileName = "Borrow_"+ f_name + str(today)+ x+ ".txt"
+     print("++" *30 +"\n\n\n")
+
+     file= open(fileName,'w')
+     file.write("Borrow Details:"+ "\n")
+     file.write("Name of Person: "+ f_name +"\n")
+     file.write("Total Price of Books: "+str(sum) +"\n")
+     file.write("Date and time of Borrow is: "+str(today) )
+     file.write( str(current_time) +"\n")
+     file.write("Books Borrowed are: "+"\n")
+     
+     for books in (borrow.borrowedBooks):
+         file.write(books + "\n")
+    
+     
+     file.close()
+     borrow.borrowedBooks.clear()
+     borrow.borrowedID.clear()
+     
+             
diff --git a/Library management system/Book.py b/Library management system/Book.py
new file mode 100644
index 0000000..7f76b86
--- /dev/null
+++ b/Library management system/Book.py	
@@ -0,0 +1,54 @@
+import borrow
+
+#Creating Book function
+def Book():
+    print("---" * 35)
+    print("Book ID".ljust(17), "Book-Name".ljust(30)  + "Author".ljust(20) + "Quantity".ljust(17) + "Price".ljust(15))
+    print("---" * 35)
+
+    #Opening and reading txt file
+    file = open('books.txt', 'r')
+    content = file.readlines()
+    def splitLines():
+        for each in content:
+            splitList = each.split(',')
+            bookID = splitList[0]
+            title = splitList[1].ljust(25)
+            if len(title) > 25:
+                title = title[0:22].ljust(25, '.')
+            author = splitList[2].ljust(25)
+            quantity = splitList[3].ljust(15)
+            price = splitList[4].ljust(15)
+
+            print(bookID.ljust(15) + title + " " * 5 + author + quantity + price)
+            borrow.bookDictionary[int(splitList[0])] = [splitList[1].strip(), splitList[2].strip(), int(splitList[3].strip()), splitList[4].strip()]
+        print("\n",borrow.bookDictionary)
+        print("\n")
+    splitLines()
+    file.close()
+
+#Creating moreBooks functon
+def moreBooks():   
+    
+    bookIDList = []
+    for each in borrow.bookDictionary:
+        bookIDList.append(each)
+    bookID = int(input("Enter another borrowed book: "))
+
+    if bookID not in bookIDList:
+        print("\n" + "++" * 30 + "\n")
+        print("Please provide a valid Book ID !!!".center(50) + "\n" + "++" * 30 + "\n")
+        moreBooks(sum)
+
+    borrow.borrowedID.append(bookID)
+    borrow.borrowedBooks.append(borrow.bookDictionary[bookID][0])
+    price2 = borrow.bookDictionary[bookID][3]
+    print("The price of book is: ",price2 + "\n")
+    print("Has This Person Borrowed Another Book?")
+    AnotherBook = input("If yes then type Y ,if not they type n: " )
+    if AnotherBook.lower() == "y":
+        moreBooks()
+    else:
+        return
+
+
diff --git a/Library management system/Return.py b/Library management system/Return.py
new file mode 100644
index 0000000..7acf455
--- /dev/null
+++ b/Library management system/Return.py	
@@ -0,0 +1,69 @@
+from datetime import date
+from datetime import datetime
+import borrow
+# Creating return_books function 
+def return_books():
+    total = 0
+    bookIDList = []
+    
+    today = date.today()
+    now = datetime.now()
+    current_time = now.strftime("%H:%M:%S")
+    
+   #Asking user details
+    for each in borrow.bookDictionary:
+        bookIDList.append(each)
+    f_name = input("Name of person who returned Book: ")
+    bookID = int(input("Enter book id to return book: "))
+
+    #Checking user input
+    if bookID not in bookIDList:
+        print("\n" + "++" * 30 + "\n")
+        print("Please provide a valid Book ID !!!".center(50) + "\n" + "++" * 30 + "\n")
+        return_books()
+    if bookID in bookIDList:
+        quantity = borrow.bookDictionary[bookID][2]
+        price = borrow.bookDictionary[bookID][3]
+        book_name = borrow.bookDictionary[bookID][0]
+        author_name = borrow.bookDictionary[bookID][1]
+
+    quantity =int(quantity)+1
+    total+=float(price[1:])
+    print(str(total))
+    # checking for fine
+    print("Is the book return date expired?")
+    Expire = input("Press Y for Yes and N for No: ")
+    x=current_time.replace(":","")
+    if(Expire.upper()=="Y"):
+        day = int(input("By how many days was the book returned late?"))
+        fine=3*day
+        total=total+fine
+    else:
+        fine = 0 
+    total = "{:.2f}".format(total)
+    
+    fileName="Return-"+f_name+str(today)+ x+".txt"
+    file = open(fileName,'w')
+    file.write("Return Details: \n")
+    file.write("Name of Person: "+ f_name+"\n")
+    file.write("Date and time of return is: "+str(today)+ " " )
+    file.write(str(current_time) +"\n")
+    file.write("Books Returend are: "+ borrow.bookDictionary[bookID][0]+"\n")
+    file.write("Price is: " +borrow.bookDictionary[bookID][3]+ "\n")
+    file.write("Fine is: "+ str(fine)+"\n")
+    print("Total Bill: "+ "$"+str(total))
+    file.write("Total: $"+ str(total))
+    
+    # Writing in file
+    borrow.bookDictionary[bookID][2]+= 1
+    with open('books.txt', 'w') as f:
+        for i in range(1, 6):
+            f.write(str(i))
+            f.write(",")
+            for j in range(4):
+                if(j == 3):
+                    f.write(str(borrow.bookDictionary[i][j]))
+                else:
+                    f.write(str(borrow.bookDictionary[i][j]))
+                    f.write(", ")
+            f.write("\n")
diff --git a/Library management system/books.txt b/Library management system/books.txt
new file mode 100644
index 0000000..329ff36
--- /dev/null
+++ b/Library management system/books.txt	
@@ -0,0 +1,5 @@
+1,The Alchemist, Paulo Coelho, 82, $4.99, 
+2,Harry Potter, J.K Rowling, 8, $9.99, 
+3,vampire Diaries, L.J Smith, 1, $12.00, 
+4,Don Quixote, Miguel de Cervantes, 96, $15.00, 
+5,Beloved, Toni Morrison, 93, $20, 
diff --git a/Library management system/borrow.py b/Library management system/borrow.py
new file mode 100644
index 0000000..fc4e570
--- /dev/null
+++ b/Library management system/borrow.py	
@@ -0,0 +1,84 @@
+from datetime import date
+from datetime import datetime
+import Book
+import Bill
+
+
+#definingempty dictionary and list
+bookDictionary = {}
+borrowedBooks = []
+borrowedID = []
+
+#Creating borrowBook Function 
+def borrowBook():
+    sum = 0
+    bookIDList = []
+    #checking user input
+    for each in bookDictionary:
+        bookIDList.append(each)
+    bookID = int(input("Enter book id to borrow book: "))
+
+    if bookID not in bookIDList:
+        print("\n" + "++" * 30 + "\n")
+        print("Please provide a valid Book ID !!!".center(50) + "\n" + "++" * 30 + "\n")
+        borrowBook()
+
+    if bookID in bookIDList:
+        
+        borrowedBooks.append(bookDictionary[bookID][0])
+        borrowedID.append(bookID)
+        quantity = bookDictionary[bookID][2]
+        if quantity == 0:
+            print("\n" + "++" * 30 + "\n" + "Book is not available!!!".center(50) + "\n" + "++" * 30 + "\n")
+            from main import main
+
+        else:
+            print("\n" + "++" * 30 + "\n" + "Book is available!!!".center(50) + "\n" + "++" * 30 + "\n")
+            
+            f_name = input("Enter the Name of person who borrowed book: ")
+            price = bookDictionary[bookID][3]
+            print("The price of book is: ",price)
+            
+            #adding date and time
+            today = date.today()
+            now = datetime.now()
+            current_time = now.strftime("%H:%M:%S")
+            
+            print("Today's date and Time: ", today,current_time, "\n")
+
+            #writing in file 
+            bookDictionary[bookID][2]-= 1
+
+            with open('books.txt', 'w') as f:
+                for i in range(1, 6):
+                    f.write(str(i))
+                    f.write(",")
+                    for j in range(4):
+                        if(j == 3):
+                            
+                            f.write(str(bookDictionary[i][j]))
+                        else:
+                            f.write(str(bookDictionary[i][j]))
+                        f.write(", ")
+                    f.write("\n")
+
+
+            print("List after a Borrow: ")
+            Book.Book()
+            print("Has This Person Borrowed Another Book?")
+            AnotherBook = input("If yes then type Y ,if not they type n: ")
+            if AnotherBook.lower() == "y":
+                Book.moreBooks()
+            
+                
+            for x in(borrowedID):
+                p = bookDictionary[x][3]
+                price = p[1:]
+                sum = sum + float(price)
+            #printing bill
+            Bill.Bill(f_name,sum,today,current_time)
+            
+           
+            
+
+
diff --git a/Library management system/main.py b/Library management system/main.py
new file mode 100644
index 0000000..b129aa5
--- /dev/null
+++ b/Library management system/main.py	
@@ -0,0 +1,44 @@
+import borrow
+import Book
+import Return
+import Bill
+
+#Defining main function
+def main():
+    # using while loop
+    while(True):
+        print("+++" * 35)
+        print("Hello and Welcome to library management system".center(100))
+        print("+++" * 35+ "\n\n")
+        Book.Book()
+        print("Enter 1 to Borrow a Book")
+        print("Enter 2 to Return a book")
+        print("Enter 3 to Exit")
+        
+        #Using try and catch for exception Handling
+        try:
+            userInput = int(input("Please enter a value: "))
+            print()
+            # Taking input from user
+            if(userInput==1):
+                print("You will now borrow a book")
+                borrow.borrowBook()
+                main()
+                break
+            elif(userInput==2):
+                print("You will now reuturn a Book")
+                Return.return_books()
+            
+            elif(userInput==3):
+                print("---"* 30)
+                print("\n Thank you for using Library management system\n".center(100))
+                print("---"* 30)
+                break
+        except ValueError:
+            print("++" *30)
+            print("Invalid Input!!\n Please enter 1, 2 or 3")
+            print("++" *30+ "\n\n")
+
+# calling main function
+main()
+