PopulationFix

population_fix.py

def population(self, year: int) -> int:
    """Obtain the population in the world for a given year.

    :param year: Year of which the population wants to be known.

    :returns: Population for that year. 0 if the year was not found.
    """
    return self.yearly_population.get(year, 0)

def population_on_2020(self) -> int:
    """Obtain the population for 2020.

    :returns: population for the year 2020.
    """
    return self.population(2020)