Take a text string and a list of dictionary objects; replaces each value in a string with the corresponding key.

utils.py

class TextLabeler():
    """Takes a text string and a list of dictionary objects; replaces each
    occurence of a value in a string with the corresponding key.  For example:

        >>> string = "Let's take a trip to Paris next January"
        >>> lod = [{'city':'Paris'}, {'month':'January'}]
        >>> processed = TextLabeler(string, lod)
        >>> processed.text
        >>> Let's take a trip to [[ city ]] next [[ month ]]

    lod: abbreviated for `List of Dicts`; expects a list of dict objects
    """

    def __init__(self, text, lod):
        self.text = text
        self.iterate(lod)

    def replace_kv(self, _dict):
        """Replace any occurrence of a value with the key"""

        for key, value in _dict.iteritems():
            label = """[[ {0} ]]""".format(key)
            self.text = self.text.replace(value, label)
            return self.text

    def iterate(self, lod):
        """Iterate over each dict object in a given list of dicts, `lod` """

        for _dict in lod:
            self.text = self.replace_kv(_dict)
        return self.text