LAB RESTRICTIONS, PLEASE READ: Do not add any imports, the ones that you need will be given to you. You may not use any lists or list methods, or any while loops. Within your loops, you MUST NOT use...

Sum string

Extracted text: LAB RESTRICTIONS, PLEASE READ: Do not add any imports, the ones that you need will be given to you. You may not use any lists or list methods, or any while loops. Within your loops, you MUST NOT use any break or continue statements. Please also do not use try-except statements, you should be able to anticipate or prevent any errors from happening at all!

will only contain the characters 0-9. pass "/>
Extracted text: Edef sum string(string: str) -> int: Given a string , return the sum of this string, as computed by the formula given below: To compute the sum of a string as defined by this function, we add every odd positioned digit, and subtract every even positioned digit. For example, if we had an input of "54321", we would add 5, subtract 4, add 3, subtract 2, and add 1, bringing us to a total of 3. In other words, you would add the first digit, subtract the second digit, and keep alternating until you reach the end of the string. If the string is empty, then the sum is 0. Note: since we give the input as a string, you will have to do some type conversion in order to solve this problem. Precondition: will only contain the characters 0-9. pass