《Python数据处理》10.2.3地图笔记

一、源码问题

源码

worldmap_chart = pygal.Worldmap()
worldmap_chart.title = 'Child Labor Worldwide'

cl_dict = {}
for r in ranked.rows:
	cl_dict[r.get('country_code_complete').lower()] = r.get('Total (%)')

worldmap_chart.add('Total Child Labor (%)', cl_dict)
worldmap_chart.render()

问题：

cl_dict[r.get('country_code_complete').lower()] = r.get('Total (%)')

改为

cl_dict[r.get('country_code').lower()] = r.get('Total (%)')

因为之前该键就是’country_code’

worldmap_chart.render_to_png('world_map.png)

二、render_to_png

worldmap_chart.render_to_png('world_map.png')

报错：

OSError: no library called "cairo" was found
no library called "libcairo-2" was found
cannot load library 'libcairo.so': error 0x7e
cannot load library 'libcairo.2.dylib': error 0x7e
cannot load library 'libcairo-2.dll': error 0x7e

似乎是少了包，安装以下包满意没有效果，解决方法参照《pygal输出png问题：dlopen() failed to load a library: cairo / cairo-2》，链接: link.注：未实测