class StoreDictionary:

dictionary: dict# usage of dictionary

def __init__(self, dictionary, version, price_decimal=2):# init() method

self.dictionary = dictionary# public class attribute of the menu dict

self.version = version# public class attribute of the menu version

self.__price_decimal = price_decimal# private class attribute of price's decimal places

def __repr__(self):# repr() method

return "Menu(%s)" % self.dictionary

def __round__(self, price):# magic method to round the input price

price = float(price)

return round(price, self.__price_decimal)

# User-defined function: whether the file exists or not

# Private class method

def __check_file_exists(self, filename):

try:# usage of try to read the file

f = open(filename)

f.close()

except Exception:

return 0

return 1

# Writing to file when we tries to save the file

# Public class method

def write_file(self, filename):

file = open(filename, 'w')

for i in self.dictionary:

file.write(i + ' ' + str(self.dictionary[i]) + ' ')# write the data for tuple format

# Reading file and storing values to dictionary

# Public class method

def read_stored_file(self, filename):

while True:

if self.__check_file_exists(filename):# function returns 0 if no file found

break

print('Enter: the input file ' + filename + ' not found')

return None

file = open(filename, 'r')

for i in file:

flr = i.strip().split(' ')

if i != '':

name, cost = tuple(flr)# usage of tuple

self.dictionary[name.strip()] = float(cost.strip())

file.close()