FileStorage for OpenCV Python API

Question

I\'m currently using FileStorage class for storing matrices XML/YAML using OpenCV C++ API.

However, I have to writ

Answer 1

In addition to @misha's response, OpenCV YAML's are somewhat incompatible with Python.

Few reasons for incompatibility are:

1. Yaml created by OpenCV doesn't have a space after ":". Whereas Python requires it. [Ex: It should be a: 2, and not a:2 for Python]
2. First line of YAML file created by OpenCV is wrong. Either convert "%YAML:1.0" to "%YAML 1.0". Or skip the first line while reading.

The following function takes care of providing that:

import yaml
import re
def readYAMLFile(fileName):
    ret = {}
    skip_lines=1    # Skip the first line which says "%YAML:1.0". Or replace it with "%YAML 1.0"
    with open(scoreFileName) as fin:
        for i in range(skip_lines):
            fin.readline()
        yamlFileOut = fin.read()
        myRe = re.compile(r":([^ ])")   # Add space after ":", if it doesn't exist. Python yaml requirement
        yamlFileOut = myRe.sub(r': \1', yamlFileOut)
        ret = yaml.load(yamlFileOut)
    return ret

outDict = readYAMLFile("file.yaml")

NOTE: Above response is applicable only for yaml's. XML's have their own share of problems, something I haven't explored completely.