Write a function named productDigit(s) that accepts a string s as the argument. Assume this string contains a series of single-digit numbers. Use a for loop to loop through each character in the string, then calculate and return the product of all the single-digit numbers in the string. For example, if the argument is '1357', your function should return 105, because 1x3x5x7=105.
Test case:
print(productDigits('1358')) 120
Python
