如何通过Python在yaml文件中的一个标签下添加列表

Question

I want to make one YAML file by python like as below.

A:
  B:
    - c: d

but if I do it as follows:

data = {'A':{'B':{'- c':'d'}}}
yaml.dump(data,file,default_flow_style = False)

the output in the file is as below:

A:
  B:
    '-c': d

How can I get rid of the quotation around the - c ?

Answer 1

The quotes are there because the - is a reserved word. If you want to make a sequence in YAML you have include a list in Python, and you only have dictionaries (which are output as mappings).

Try:

data = {'A':{'B': [{'c':'d'}]}}
yaml.dump(data, sys.stdout, default_flow_style = False)

which gets you:

A:
  B:
  - c: d