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import sys
from ruamel.yaml import YAML
data = {1: {1: [{1: 1, 2: 2}, {1: 1, 2: 2}], 2: 2}, 2: 42}
yaml = YAML()
yaml.explicit_start = True
yaml.dump(data, sys.stdout)
yaml.indent = 4
yaml.block_seq_indent = 2
yaml.dump(data, sys.stdout)
def sequence_indent_four(s):
# this will fail on direclty nested lists: {1; [[2, 3], 4]}
levels = []
ret_val = ''
for line in s.splitlines(True):
ls = line.lstrip()
indent = len(line) - len(ls)
if ls.startswith('- '):
if not levels or indent > levels[-1]:
levels.append(indent)
elif levels:
if indent < levels[-1]:
levels = levels[:-1]
# same -> do nothing
else:
if levels:
if indent <= levels[-1]:
while levels and indent <= levels[-1]:
levels = levels[:-1]
ret_val += ' ' * len(levels) + line
return ret_val
yaml = YAML()
yaml.explicit_start = True
yaml.dump(data, sys.stdout, transform=sequence_indent_four)
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