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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_name(self,item):
 """ Return the name for this item registered with this NameSelector. If no name has previously been registered, then generate a new one. """

        if not isinstance(item,ford.sourceform.FortranBase):
            raise Exception('{} is not of a type derived from FortranBase'.format(str(item)))

        if item in self._items:
            return self._items[item]
        else:
            if item.get_dir() not in self._counts:
                self._counts[item.get_dir()] = {}
            if item.name in self._counts[item.get_dir()]:
                num = self._counts[item.get_dir()][item.name] + 1
            else:
                num = 1
            self._counts[item.get_dir()][item.name] = num
            name = item.name.lower().replace('<','lt')
            # name is already lower
            name = name.replace('>','gt')
            name = name.replace('/','SLASH')
            if name == '': name = '__unnamed__'
            if num > 1:
                name = name + '~' + str(num)
            self._items[item] = name
            return name