Python ООП

cDict = {} 
cTuple = () 
f = open('in1.txt', encoding = 'utf-8') 
for line in f: 
   country, count = line.strip().split(', ',1) 
   cDict[country] = tuple(count.split(', ')) 
print(cDict)

def val(self,max,min): 
 for k, v in cDict.items(): 
    n = int(v[0]) 
    if (n <= max) and (n >= min): 
       print(n) 
return(foo)

class Geo:
    countries = {}
 
    def __init__(self, filename):
        with open(filename) as f_obj:
            for line in f_obj:
                line_list = line.split()
                self.countries[line_list[0]] = tuple(line_list[1:])
 
    def __filtersort_countries(self, mi, ma, i):
        filtered = [c for c in sorted(self.countries.items()) if mi < float(self.countries[c[0]][i]) < ma]
        return sorted(filtered, key=lambda item: float(item[1][i]), reverse=True)
 
    def population_in_range(self, minimum, maximum):
        print('\nPopulation in range {}-{}:\n'.format(minimum, maximum))
 
        for c in self.__filtersort_countries(minimum, maximum, 2):
            print('\t', c)
 
    def area_in_range(self, minimum, maximum):
        print('\nArea in range {}-{}:\n'.format(minimum, maximum))
 
        for c in self.__filtersort_countries(minimum, maximum, 1):
            print('\t', c)
 
    def get_country_by_capital(self, capital):
 
        for c in self.countries:
            if self.countries[c][0] == capital:
                print('\n{} is the capital of {}'.format(capital, c))
 
 
g = Geo('INPUT.txt')
g.population_in_range(100, 10000000)  # no russia (12M vs 10M)
g.area_in_range(200, 3000)  # no usa (200 vs 177)
g.get_country_by_capital('Ottawa')