d = {}
d['fruits'] = {}
d['fruits']['orange'] = {}
d['fruits']['orange']['price'] = 5.75

my_keystring = "fruits.orange.price"

def get_value(keystring, dictionary):
    amountkeys = keystring.count('.')+1
    lastfoundindex = 0
    counter = 0

    while counter < amountkeys:
            if counter == 0:
                    value = dictionary[keystring[lastfoundindex:keystring.find('.')]]

            elif counter == amountkeys - 1:
                    value = value[keystring[lastfoundindex:]]
                    break
            else:
                    value = value[keystring[lastfoundindex:keystring.find('.',lastfoundindex)]]

            lastfoundindex = keystring.find('.',lastfoundindex)+1
            counter += 1

    return value

print(F"Demo get_value(): {get_value(my_keystring, d)}nThis is the PRICE of ORANGE in FRUITS.")

def set_value(keystring, dictionary, new_value):
    amountkeys = keystring.count('.')+1
    lastfoundindex = 0
    counter = 0

    while counter < amountkeys:
            if counter == 0:
                    value = dictionary[keystring[lastfoundindex:keystring.find('.')]]

            elif counter == amountkeys - 1:
                    value[keystring[lastfoundindex:]] = new_value
                    break
            else:
                    value = value[keystring[lastfoundindex:keystring.find('.',lastfoundindex)]]

            lastfoundindex = keystring.find('.',lastfoundindex)+1
            counter += 1

    value = new_value
    return value

print(F"Demo set_value(): {set_value(my_keystring, d, 1.25)}nThis is the NEW PRICE of ORANGE in FRUITS!")

def del_entry(keystring, dictionary):
    amountkeys = keystring.count('.')+1
    lastfoundindex = 0
    counter = 0

    while counter < amountkeys:
            if counter == 0:
                    value = dictionary[keystring[lastfoundindex:keystring.find('.')]]

            elif counter == amountkeys - 1:
                    del value[keystring[lastfoundindex:]]
                    break
            else:
                    value = value[keystring[lastfoundindex:keystring.find('.',lastfoundindex)]]

            lastfoundindex = keystring.find('.',lastfoundindex)+1
            counter += 1

del_entry('fruits.orange.price',d)
print(F"Demo del_entry(): fruits.orange.price is now {get_value('fruits.orange', d)}!")


def add_entry(keystring, dictionary, entry_name, entry_value = None):
    amountkeys = keystring.count('.')+1
    lastfoundindex = 0
    counter = 0

    while counter < amountkeys:
            if counter == 0:
                    value = dictionary[keystring[lastfoundindex:keystring.find('.')]]

            elif counter == amountkeys - 1:
                    value[keystring[lastfoundindex:]][entry_name] = entry_value
                    break
            else:
                    value = value[keystring[lastfoundindex:keystring.find('.',lastfoundindex)]]

            lastfoundindex = keystring.find('.',lastfoundindex)+1
            counter += 1

add_entry('fruits.orange', d, 'in_stock', True)
print(F"Demo add_entry()! Added a new entry called in_stock to fruits.orange, it's value is: {get_value('fruits.orange.in_stock',d)}")