python yaml.dump 缩进错误

Question

我正在执行以下 python 代码:

import yaml


foo = {
    'name': 'foo',
    'my_list': [{'foo': 'test', 'bar': 'test2'}, {'foo': 'test3', 'bar': 'test4'}],
    'hello': 'world'
}

print(yaml.dump(foo, default_flow_style=False))

但正在打印:

hello: world
my_list:
- bar: test2
  foo: test
- bar: test4
  foo: test3
name: foo

代替:

hello: world
my_list:
  - bar: test2
    foo: test
  - bar: test4
    foo: test3
name: foo

如何以这种方式缩进 my_list 元素？

Answer 1

This ticket建议当前的实现正确地遵循 the spec :

The “-”, “?” and “:” characters used to denote block collection entries are perceived by people to be part of the indentation. This is handled on a case-by-case basis by the relevant productions.

在同一个线程上，还有this code snippet (修改以适合您的示例)以获得您正在寻找的行为:

import yaml

class MyDumper(yaml.Dumper):

    def increase_indent(self, flow=False, indentless=False):
        return super(MyDumper, self).increase_indent(flow, False)

foo = {
    'name': 'foo',
    'my_list': [
        {'foo': 'test', 'bar': 'test2'},
        {'foo': 'test3', 'bar': 'test4'}],
    'hello': 'world',
}

print yaml.dump(foo, Dumper=MyDumper, default_flow_style=False)