Question

I have a function:

def save(self, text, *index): 
    file.write(text + '\nResults:\n')
    if index == (): index = (range(len(self.drinkList)))
    for x in index:
        for y in self.drinkList[x].ing:
            file.write('min: ' + str(y.min) + ' max: ' + str(y.max) + ' value: ' + str(y.perc) + '\n')
        file.write('\n\n')
    file.write('\nPopulation fitness: ' + str(self.calculatePopulationFitness()) + '\n\n----------------------------------------------\n\n')

Now, when I pass one argument as an index the function works as it is supposed to, but when I pass a tuple of 2 indices I get an TypeError: list indices must be integers, not tuple. What should I change?

Answer 1

The save(self, text, *index) syntax means that index is itself a
tuple with all the arguments passed to save after the text one.

So, for instance, if you have in your code:

myobject.save("sample text", 1, 2, 3)

then index will be the tuple (1, 2, 3) and the for x in
index will correctly loop over values 1, 2, 3.

On the other hand, if you haveL

myobject.save("sample text", (1,2))

then index will be the 1-element tuple ((1,2),) and the x in the
loop will get the value (1,2), hence the TypeError.