py3.5-json模块练习

world_population.py:

import json

import pygal.maps.world
from pygal.style import RotateStyle

from country_codes import get_country_code

# 将数据加载到一个列表中
filename = ‘population_data.json‘
with open(filename) as f:
 ???pop_data = json.load(f)

# 创建一个包含人口数量的字典
cc_populations = {}
for pop_dict in pop_data:
 ???if pop_dict[‘Year‘] == ‘2010‘:
 ???????country_name = pop_dict[‘Country Name‘]
 ???????population = int(float(pop_dict[‘Value‘]))
 ???????code = get_country_code(country_name)
 ???????if code:
 ???????????cc_populations[code] = population

# 根据人口数量将所有的国家分成三组
cc_pops_1, cc_pops_2, cc_pops_3 = {}, {}, {}
for cc, pop in cc_populations.items():
 ???if pop < 10000000:
 ???????cc_pops_1[cc] = pop
 ???elif pop < 1000000000:
 ???????cc_pops_2[cc] = pop
 ???else:
 ???????cc_pops_3[cc] = pop

wm_style = RotateStyle(‘#336699‘)
wm = pygal.maps.world.World(style=wm_style)
wm.title = ‘World Population in 2010, by Country‘
wm.add(‘0-10m‘, cc_pops_1)
wm.add(‘10m-1bn‘, cc_pops_2)
wm.add(‘>1bn‘, cc_pops_3)

wm.render_to_file(‘world_population.svg‘)

countries.py:

from pygal_maps_world.i18n import COUNTRIES

for country_code in sorted(COUNTRIES.keys()):
 ???print(country_code, COUNTRIES[country_code])

country_codes.py:

from pygal_maps_world.i18n import COUNTRIES


def get_country_code(country_name):
 ???"""根据指定的国家，返回Pygal使用的两个字母的国别码"""
 ???for code, name in COUNTRIES.items():
 ???????if name == country_name:
 ???????????return code
 ???# 如果没有找到指定的国家，就返回None
 ???return ?None

py3.5-json模块练习

原文地址：http://www.cnblogs.com/silverbulletcy/p/7990113.html