[New-bugs-announce] [issue46792] Indentation now preserved with ruamel.yaml.round_trip_dump

[Harshini]

New submission from Harshini <nvorugan at qti.qualcomm.com>:

I observed that the indentation is not preserved when I load and dump a YAML file using round_trip_dump from ruamel.yaml. For example, I have an input file with the data:

Inventory:
  - name: Apples
    count: 10
    vendors:
    - - vendor_name: xyz
        boxes: 2

  - name: Bananas
    number: 20
    vendors:
    - - vendor_name: abc
        boxes: 1
      - vendor_name: xyz
        boxes: 4


I wrote a simple script that just loads and dumps the same data into a new YAML file:

import sys
import os
import ruamel.yaml

yaml = ruamel.yaml.YAML()
input_file = sys.argv[1]
output_yaml =  r"data_output.yaml"
output = open(output_yaml, 'w+')
with open(input_file, 'r') as f:
    data = yaml.load(f)
    ruamel.yaml.round_trip_dump(data, output)    


I would expect the output yaml to be the same as the input yaml but what is see is:

Inventory:
- name: Apples
  count: 10
  vendors:
  - - vendor_name: xyz
      boxes: 2
- name: Bananas
  number: 20
  vendors:
  - - vendor_name: abc
      boxes: 1
    - vendor_name: xyz
      boxes: 4

It is missing the indentation under Inventory as there should be a tab before "- name" .

----------
components: Library (Lib)
files: input.yaml
messages: 413502
nosy: nvorugan
priority: normal
severity: normal
status: open
title: Indentation now preserved with ruamel.yaml.round_trip_dump
type: behavior
versions: Python 3.8
Added file: https://bugs.python.org/file50629/input.yaml

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46792>
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