import yaml
data = dict(
A = 'a',
B = dict(
C = 'c',
D = 'd',
E = 'e',
)
)
with open('data.yml', 'w') as outfile:
yaml.dump(data, outfile, default_flow_style=False)
该default_flow_style=False参数对于产生所需的格式（流样式）是必需的，否则对于嵌套集合，它将产生块样式：
A: a
B: {C: c, D: d, E: e}
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