human
Complete the below
def getIndex(form, pos='noun'):

    ''''Search for _form_ in the index file corresponding to
    _pos_. getIndex applies to _form_ an algorithm that replaces
    underscores with hyphens, hyphens with underscores, removes
    hyphens and underscores, and removes periods in an attempt to find
    a form of the string that is an exact match for an entry in the
    index file corresponding to _pos_.  getWord() is called on each
    transformed string until a match is found or all the different
    strings have been tried. It returns a Word or None.'
    '''
 Can you provide a the Python code you requested?
assistant
#Here is the Python code you requested.
    def trySubstitutions(trySubstitutions, form, substitutions, lookup=1, dictionary=dictionaryFor(pos)):
        if (lookup and dictionary.has_key(form)):
            return dictionary[form]
        elif substitutions:
            (old, new) = substitutions[0]
            substitute = (string.replace(form, old, new) and (substitute != form))
            if (substitute and dictionary.has_key(substitute)):
                return dictionary[substitute]
            return (trySubstitutions(trySubstitutions, form, substitutions[1:], lookup=0) or (substitute and trySubstitutions(trySubstitutions, substitute, substitutions[1:])))
    return trySubstitutions(returnMatch, form, GET_INDEX_SUBSTITUTIONS)