Merge pull request #107 from lironmiz/unit7-Ex7.2.6

Create unit7_ex7.2.6.py

Author: lironmiz

Diff for: unit7_ex7.2.6.py

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+# exercise 7.2.6 from unit 7
+'''
+Write a program that receives from the user a single string representing a list of products 
+for shopping, separated by commas without spaces.
+An example of an input string: "Milk,Cottage,Tomatoes".
+
+The program asks the user to key in a number (digit) in the range of one to nine
+(there is no need to check the correctness of the input).
+Depending on the number received, perform one of the following actions, according to
+the following breakdown:
+
+The program asks the user to key in a number (digit) in the range of one to nine
+(there is no need to check the correctness of the input).
+Depending on the number received, perform one of the following actions, according
+to the following breakdown:
+
+1.Printing the list of products
+2.Printing the number of products in the list
+3.Printing the answer to the test "Is the product on the list?" (The user will be asked to enter a product name)
+4.Printing the answer to the test "How many times does a certain product appear?" (The user will be asked to enter a product name)
+5.Deleting a product from the list (the user will be asked to tap a product name, only one product will be deleted)
+6.Adding a product to the list (the user will be asked to tap a product name)
+7.Printing all invalid products (a product is invalid if its length is less than 3 or it contains characters other than letters)
+8.Removing all existing duplicates in the list
+
+Output
+
+Please note, after the user makes a selection, the user will return to the main menu until he
+selects the exit (he will press the number 9).
+
+Guidelines
+Transfer the products that the program accepts to the list.
+Use additional functions of your choice.
+
+'''
+
+def main():
+    products = input("Enter a string of products separated by commas: ").split(",")
+
+    while True:
+        print("Menu:")
+        print("1. Print the list of products")
+        print("2. Print the number of products in the list")
+        print("3. Check if a product is on the list")
+        print("4. Count the number of occurrences of a product")
+        print("5. Delete a product from the list")
+        print("6. Add a product to the list")
+        print("7. Print invalid products")
+        print("8. Remove duplicates from the list")
+        print("9. Exit")
+
+        choice = int(input("Enter your choice 1-9: "))
+        if choice == 1:
+            print(products)
+        elif choice == 2:
+            print(len(products))
+        elif choice == 3:
+            product = input("Enter a product name: ")
+            if product in products:
+                print("The product is on the list.")
+            else:
+                print("The product is not on the list.")
+        elif choice == 4:
+            product = input("Enter a product name: ")
+            print(products.count(product))
+        elif choice == 5:
+            product = input("Enter a product name: ")
+            products.remove(product)
+        elif choice == 6:
+            product = input("Enter a product name: ")
+            products.append(product)
+        elif choice == 7:
+            invalid_products = [p for p in products if len(p) < 3 or not p.isalpha()]
+            print(invalid_products)
+        elif choice == 8:
+            products = list(set(products))
+        elif choice == 9:
+            break
+
+if __name__ == "__main__":
+    main()