Version 1 Lab 08

code/dan/python/lab08.py

@@ -0,0 +1,37 @@
+# Version 1
+
+user_input = input("Please enter your 16 digit card number with no spaces: ")
+
+# create a function to for cc validation
+def cc_check(card):
+    num_list = list(card) # Create a list 
+    check_digit = num_list[14:15:]# Store check digit
+    print (check_digit)
+    num_list.reverse() # reverse the list
+    every_other = num_list[::2] # get every other element and add to new list 
+    every_other = [int(i) for i in every_other] #turn list items to integers
+    doubled_list = [num * 2 for num in every_other]
+    print (doubled_list)
+    # for loop to find integers larger then 9 to subtract 9
+    counter = 0
+    for num in doubled_list:
+        if num >= 9:
+            num -= 9 
+            doubled_list[counter] = num
+        counter += 1
+    print (doubled_list)
+    # sum all values on list
+    all_values = sum(doubled_list)
+    print (all_values)
+    all_values = str(all_values)
+    validation_digit = all_values[1]
+    if validation_digit == check_digit:
+        return True
+    else:
+        return False 
+
+results = cc_check (user_input)       
+if results == True:
+    print("This credit card is valid")
+else:
+    print ("This credit card is invalid")