Apply regex patterns and substitutions to text with a map

replacer.py

class RegexpReplacer(object):
    """
    Take in list or dictionary of regex patterns and substitutes, and apply them to text with a map.
    """

    def __init__(self, patterns):
        if type(patterns) is dict:
            self.patterns = [(re.compile(r"{}".format(regex)), patterns['replace'])
                             for regex in patterns['pattern']]
        else:
            self.patterns = [(re.compile(r"{}".format(regex)), repl) for (regex, repl) in patterns]

    def _map(self, text):
        for pattern, repl in self.patterns:
            (text, count) = re.subn(pattern, repl, text)
        return text

    def replace(self, text):
        return self._map(text.lower()).upper()