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import json import pygal_maps_world.maps from pygal.style import LightColorizedStyle as LCS, RotateStyle as RS from pygal.maps.world import COUNTRIES def get_country_code(country_name): """将指定国家的名字以2字母形式表达""" for code, name in COUNTRIES.items(): if name == country_name: return code # 如果没有找到那个国家 return None # 读取文件 filename = 'population_data.json' with open(filename) as f: pop_data = json.load(f) cc_populations = {} # 将有代码的国家以一个字典形式储存 for pop_dict in pop_data: if pop_dict['Year'] == '2010': country_name = pop_dict['Country Name'] population = int(float(pop_dict['Value'])) # 将字符串转变成float，然后转成int code = get_country_code(country_name) # 得到国家的代码 # 如果代码存在： if code: cc_populations[code] = population # else: # print('ERROR - ' + country_name) # 分三个字典储存 cc_pops_1, cc_pops_2, cc_pops_3 = {}, {}, {} for cc, pop in cc_populations.items(): # country code, country population if pop < 10000000: cc_pops_1[cc] = pop elif pop < 1000000000: cc_pops_2[cc] = pop else: cc_pops_3[cc] = pop # 得到每一层的总共的长度 # print(len(cc_pops_1), len(cc_pops_2), len(cc_pops_3)) wm = pygal_maps_world.maps.World() wm_style = RS('#336699', base_style=LCS) wm = pygal_maps_world.maps.World() wm.force_uri_protocol = 'http' wm.title = 'World Population in 2010' wm.add('0-10m', cc_pops_1) # 注意这里添加的是字典 wm.add('10m-1bn', cc_pops_2) wm.add('>1bn', cc_pops_3) wm.render_to_file('world_population.svg')