'''
    DS2000
    Fall 2024
    Sample code from class - functions and scope!

    Takeaways:
    - function variables/parameters do not need to have the same
        names as when we call them
    - functions are independent, standalone mini programs
    - functions GET information via parameters
    - fuctions GIVE information via return
'''

def process_lst(whole_str, long, lat):
    '''
        parameters: string, two ints (positions)
        returns: list of strings, except at the two positions which are floats
        does: converst the string into a lis of strings,
              converts the list at the two given positions into floats
    '''
    lst = whole_str.split(",")
    lst[lat] = float(lst[lat])
    lst[long] = float(lst[long])
    return lst


def main():
    # Step one: messing around with calling our function, and variable names

    # The function has a parameter whole_str. Can I do this?
    # Nope, whole_str is not defined :(
    # print(whole_str)

    # Let's call the function with some values
    whole_str = "ab,2.1,1.5"
    lat = 1
    long = 2

    # define a local function result, just empty string
    result = ""

    # NOW, can I do this becuase I have a local variable named whole_str
    print(whole_str)

    # the value in result changes because I called a function that returns something
    # whole_str, lat, long are the SAME names as what the function has
    result = process_lst(whole_str, long, lat)
    print(result)

    # Call the function again using different values
    a = "ls,3.4,8.6"
    x = 1
    y = 2
    result = process_lst(a, x, y)
    print(result)


main()