Words that end in -a can refer to both genders, even in latin languages.
For instance, 'barista' applies to both men and women in Italy.
For instance, 'barista' applies to both men and women in Italy.
There are exceptions to the rule, like the one above (Zapatistas) or some professions like "doctores" or "jueces", but they are exception not the rule. There are also many words that dont have a feminine plural, i.e "las soldados", "las jueces", etc
In Italian it is true that the last letter is not a perfect indication of gender... even for people's names (e.g. Andrea should be a male name). But it works pretty well. Not sure if Spanish is similar (i.e. there are exceptions) or not.
The Python case is similar to the widely used "fashionista" for females and "fashionisto" for males in the fasion. Thus it is expected to be "pythonisto" and "pythonistos" for male(s) until there is some gender confusion :)