Update YAML file programmatically

Question

I've a Python dict that comes from reading a YAML file with the usual ``` yaml.load(stream) ``` I'd like to update the YAML file programmatically given a path to be updated like: group1,option1,option11,value and save the resulting dict again as a yaml file. I'm facing the problem of updating a dicntionary, taking into account that the path is dynamic (let's say a user is able to enter the path through a simple CLI I've created using Cmd). Any ideas? thanks! UPDATE Let me be more specific on the question: The issue is with updating part of a dictionary where I do not know in advance the structure. I'm working on a project where all the configuration is stored on YAML files, and I want to add a CLI to avoid having to edit them by hand. This a sample YAML file, loaded to a dictionary (config-dict) using PyYaml: ``` config: a-function: enable b-function: disable firewall: NET: A: uplink: enable downlink: enable B: uplink: enable downlink: enable subscriber-filter: cancellation-timer: 180…

Accepted Answer

In fact the solution follows simple patter: load - modify - dump:

Before playing, be sure you have pyyaml installed:

```
$ pip install pyyaml
```

`testyaml.py`

```
import yaml
fname = "data.yaml"

dct = {"Jan": {"score": 3, "city": "Karvina"}, "David": {"score": 33, "city": "Brno"}}

with open(fname, "w") as f:
    yaml.dump(dct, f)

with open(fname) as f:
    newdct = yaml.load(f)

print newdct
newdct["Pipi"] = {"score": 1000000, "city": "Stockholm"}

with open(fname, "w") as f:
    yaml.dump(newdct, f)
```

Resulting `data.yaml`

```
$ cat data.yaml
David: {city: Brno, score: 33}
Jan: {city: Karvina, score: 3}
Pipi: {city: Stockholm, score: 1000000}
```

Update YAML file programmatically

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