Python中是否有支持将长字符串转储为块文字或折叠块的yaml库？

Question

我希望能够转储一个字典，该字典包含我希望以块样式包含的长字符串，以提高可读性。例如：

foo: |
  this is a
  block literal
bar: >
  this is a
  folded block

PyYAML支持这种样式的文档加载，但是我似乎找不到找到这种方式转储文档的方法。我想念什么吗？

Answer 1

import yaml

class folded_unicode(unicode): pass
class literal_unicode(unicode): pass

def folded_unicode_representer(dumper, data):
    return dumper.represent_scalar(u'tag:yaml.org,2002:str', data, style='>')
def literal_unicode_representer(dumper, data):
    return dumper.represent_scalar(u'tag:yaml.org,2002:str', data, style='|')

yaml.add_representer(folded_unicode, folded_unicode_representer)
yaml.add_representer(literal_unicode, literal_unicode_representer)

data = {
    'literal':literal_unicode(
        u'by hjw              ___\n'
         '   __              /.-.\\\n'
         '  /  )_____________\\\\  Y\n'
         ' /_ /=== == === === =\\ _\\_\n'
         '( /)=== == === === == Y   \\\n'
         ' `-------------------(  o  )\n'
         '                      \\___/\n'),
    'folded': folded_unicode(
        u'It removes all ordinary curses from all equipped items. '
        'Heavy or permanent curses are unaffected.\n')}

print yaml.dump(data)

结果：

folded: >
  It removes all ordinary curses from all equipped items. Heavy or permanent curses
  are unaffected.
literal: |
  by hjw              ___
     __              /.-.\
    /  )_____________\\  Y
   /_ /=== == === === =\ _\_
  ( /)=== == === === == Y   \
   `-------------------(  o  )
                        \___/

为了完整起见，还应该有str实现，但是我会很懒惰:-)