1

I have the following test.yaml document:

components:
  schemas:
    description: 'ex1'
    description: 'ex2'

and the following python script that reads the yaml:

import ruamel.yaml

ruamel.yaml.YAML().allow_duplicate_keys = True
def read_yaml_file(filename: str):
    with open(filename, 'r') as stream:
       
        my_yaml = ruamel.yaml.round_trip_load(stream, preserve_quotes=True)
        return my_yaml
      
my_yaml = read_yaml_file('test.yaml')

Question How to get past the following error? (I don't mind if the keys are overwritten)

ruamel.yaml.constructor.DuplicateKeyError: while constructing a mapping
  in "test.yaml", line 3, column 5
found duplicate key "description" with value "ex2" (original value: "ex1")
  in "test.yaml", line 4, column 5
alexander123
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  • Where did you pick up this style of loading? I hope there is no such example in the manual, so I would like to know. – Anthon Aug 10 '21 at 11:39
  • I picked it up from an answer to another question, it is actually your answer, but it is from 5 years ago. Here is the link [link](https://stackoverflow.com/questions/38369833/pyyaml-and-using-quotes-for-strings-only?answertab=votes#tab-top). – alexander123 Aug 10 '21 at 11:59

1 Answers1

0

You're mixing the new style API with the old (PyYAML) style API, you shouldn't. The YAML() instance on which you set .allow_duplicate_keys is immediately destroyed the way you do things, you should use its .load() method to load the non-YAML you have as input:

import sys
import ruamel.yaml

yaml_str = """\
components:
  schemas:
    description: 'ex1'
    description: 'ex2'
"""

yaml = ruamel.yaml.YAML()
yaml.allow_duplicate_keys = True
yaml.preserve_quotes = True
# yaml.indent(mapping=4, sequence=4, offset=2)
data = yaml.load(yaml_str)
yaml.dump(data, sys.stdout)

which gives:

components:
  schemas:
    description: 'ex1'

This means the value for key description doesn't get overwritten, instead the first value in the file, for that key, is preserved.

Anthon
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