Polished Numberplay script

Numberplay/Python/mu_numberplay.py

@@ -0,0 +1,68 @@
+print("Welcome to NumberPlay.py")
+print("Type a number and type 'q/quit' to quit")
+
+
+# FUNCTIONS
+def check_input(i):
+    if i == "q" or i == "quit":
+        return True
+
+    try:
+        int(i)
+    except ValueError:
+        print("Error: Please type numbers!")
+        return False
+
+    if len(i) > 10:
+        print("Error: Digits must be 10 or less!")
+        return False
+
+    if int(i) < 0:
+        print("Error: Negatives not allowed!")
+        return False
+
+    if " " in i:
+        print("Error: Blank spaces found!")
+        return False
+
+    return True
+
+
+def give_output(i):
+    if not i[0] == "q":
+        user_input_list = list(i)
+
+        numbers = [int(n) for n in user_input_list]
+
+        res = []
+
+        for num in range(len(numbers)):
+            if (num+1) % 2 == 0:
+                res.append(numbers[num])
+
+        sum_numbers = sum(res)
+
+        if len(str(sum_numbers)) == 2:
+            while not len(str(sum_numbers)) == 1:
+                str_sum_numbers = str(sum_numbers)
+                new_sum = int(str_sum_numbers[0]) + int(str_sum_numbers[1])
+                sum_numbers = new_sum
+
+        print(sum_numbers)
+
+
+# END USER
+
+user_input = ""
+
+while not user_input.lower() == "q" or user_input.lower() == "quit":
+    # GETTING USER INPUT
+    user_input = input("> ").lower()
+
+    # PROCEEDING IF INPUT IS VALID
+    if not check_input(user_input):
+        continue
+    else:
+        give_output(user_input)
+
+print("Good Bye!")