pyyaml

I'm writing a file type converter using Python and PyYAML for a project where I am translating to and from YAML files multiple times. These file are then used by a separate service that I have no control over, so I need to translate back the YAML the same as I originally got it. My original file has sections of the following: key: - value1 - value2 - value3 Which evaluates to {key: [value1,value2,value3]} using yaml.load() . When I translate this back to YAML my new file reads like this: key: [value1,value2,value3] My question is whether these two forms are equivalent as far as the various

We are in need of parsing YAML files which contain duplicate keys and all of these need to be parsed. It is not enough to skip duplicates. I know this is against the YAML spec and I would like to not have to do it, but a third-party tool used by us enables this usage and we need to deal with it. File example: build: step: 'step1' build: step: 'step2' After parsing we should have a similar data structure to this: yaml.load('file.yml') # [('build', [('step', 'step1')]), ('build', [('step', 'step2')])] dict can no longer be used to represent the parsed contents. I am looking for a solution in

I was trying to install chatterbot which has a dependency on PyYAML=3.12 . In my Ubuntu machine installed PyYAML version is 3.11. So I used the following command to upgrade PyYAML : sudo -H pip3 install --upgrade PyYAML But it gives the following error: Cannot uninstall 'PyYAML'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall. My pip3 version is 10.0.0. How to resolve this? Try using the --ignore-installed flag: sudo -H pip3 install --ignore-installed PyYAML This works because to upgrade a

I have a some.yaml file with the below contents. init_config: {} instances: - host: <IP> username: <username> password: <password> The yaml file should be parsed and updated as below. init_config: {} instances: - host: 1.2.3.4 username: Username password: Password How do I parse the values and update them appropriately? The ruamel.yaml package was specifically enhanced (by me starting from PyYAML) to do this kind of round-trip, programmatic, updating. If you start with (please note I removed the extra initial spaces): init_config: {} instances: - host: <IP> # update with IP username: <username

I'm making a document generator from YAML data, which would specify which line of the YAML file each item is generated from. What is the best way to do this? So if the YAML file is like this: - key1: item 1 key2: item 2 - key1: another item 1 key2: another item 2 I want something like this: [ {'__line__': 1, 'key1': 'item 1', 'key2': 'item 2'}, {'__line__': 3, 'key1': 'another item 1', 'key2': 'another item 2'}, ] I'm currently using PyYAML, but any other library is OK if I can use it from Python. puzzlet I've made it by adding hooks to Composer.compose_node and Constructor.construct_mapping :

I need to write the below data to yaml file using Python: {A:a, B:{C:c, D:d, E:e}} i.e., dictionary in a dictionary. How can I achieve this? Matthew Trevor import yaml data = dict( A = 'a', B = dict( C = 'c', D = 'd', E = 'e', ) ) with open('data.yml', 'w') as outfile: yaml.dump(data, outfile, default_flow_style=False) The default_flow_style=False parameter is necessary to produce the format you want (flow style), otherwise for nested collections it produces block style: A: a B: {C: c, D: d, E: e} lou Link to the PyYAML documentation showing the difference for the default_flow_style parameter.