Arguments given to a function can be used like any other variable. Recall that we can concatenate a string and a variable like this: my_concatenated_string = "HOLY " + cow_string_var.
So all we need to do for this function is return parameter_name + "the string it wants us to concatenate with it!".
Note that s is written as a variable, not a string. We are given to assume that s has been given some assignment prior to this function call.
def string_function(to_add):
return "String to concatenate with... " + to_add
s = "Add me to the string!"
print (string_function(s))
# String to concatenate with... Add me to the string!