Ported Lahiru's tokneizer code over. Appears to work fine. Also did some house keeping.

main.py

@@ -1,47 +1,8 @@
 import token
+import tokenizer
+#userInput = input('Enter your formula: ')
+tokens = tokenizer.get_tokens_from_expression_string("1 + 2 / 3 (3 * 4) 5")
 
-def flatten_input(input):
-    tokens = []
-    tmp = ""
-    parsing_number = False
-
-    for i in range(0, len(input)):
-        c = input[i]
-        if c == '.' or c.isdigit():
-            if len(tokens) > 1:
-                lookBehind = tokens[len(tokens) - 1]
-
-                if lookBehind == token.TokenType.exp_start:
-                    tokens.append(token.Token("^", token.TokenType.power))
-            if (i + 1) == len(input):
-                tokens.append(token.Token(tmp + c, token.TokenType.constant))
-
-            parsing_number = True
-            tmp = tmp + c
-            continue
-
-    print(tokens)
-
-def operate(n1, n2, tokenType):
-    if tokenType == token.TokenType.add:
-        print("Adding %d and %d to get %d." %(n1, n2, n1 + n2))
-    elif tokenType == token.TokenType.subtract:
-        print("Subtracting %d and %d to get %d." %(n1, n2, n1 - n2))
-    elif tokenType == token.TokenType.multiply:
-        print("Multiplying %d and %d to get %d" %(n1, n2, n1 * n2))
-    elif tokenType == token.TokenType.divide:
-        print("Dividing %d and %d to get %d" %(n1, n2, n1 / n2))
-    elif tokenType == token.TokenType.power:
-        print("Raising %d to the power of %d to get %d" %(n1, n2, n1**n2))
-    else:
-        raise ValueError(f"Invalid operator value.")
-
-#t1 = token.TokenType()
-#t = token.Token("+", token.TokenType.add)
-#print(t1.get_operator_verb(t.type))
-operate(10, 2, 4)
-operate(10, 2, 0)
-operate(10, 2, 1)
-operate(10, 2, 2)
-operate(10, 2, 3)
-flatten_input("THis is 96.")
+for t in tokens:
+	print("%s (%s) " %(t.value, token.TokenType.get_operator_name(t.type)), end = "")
+print()