PlayerStatistics.py

import json
import os


class PlayerStatistics:
    def __init__(self):
        self.data = {}
        self.save_file = 'stats.json'

    def update_player(self, name, ratio):
        # if player hasn't played yet -> register in dictionary
        if not self.data.__contains__(name):
            self.data[name] = 0
            self.save_to_file()

        # if score of current game is higher than in dictionary -> highscore
        if ratio > self.data[name]:
            self.data[name] = ratio
            self.save_to_file()

    def is_new_highscore(self, name, ratio):
        try:
            return ratio > self.data[name]
        except KeyError:
            # if player has not been found -> first score => highscore
            return True

    def save_to_file(self):
        # saves data from dictionary into the file
        with open(self.save_file, 'w') as outfile:
            json.dump(self.data, outfile)

    def load_from_file(self):
        if not os.path.exists(self.save_file):
            # creates new file if it doesn't exist
            open(self.save_file, 'w').close()
            self.save_to_file()

        # loads data from file into the dictionary
        with open(self.save_file) as file:
            self.data = json.load(file)

    def get_highscore(self, name):
        try:
            return self.data[name]
        except KeyError:
            return None