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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def parse_file(file_or_path, encoding='utf-8', validate=False):
 """ Tries to parse a given filepath or fileobj into a Bibliography instance. If ``validate`` is passed as keyword argument and set to ``True``, the Bibliography will be validated using the standard rules. """

    try:
        is_string = isinstance(file_or_path, basestring)
    except NameError:
        is_string = isinstance(file_or_path, str)
    if is_string:
        with codecs.open(file_or_path, 'r', encoding) as file_:
            result = pattern.parseFile(file_)[0]
    else:
        result = pattern.parseFile(file_or_path)[0]
    if validate:
        result.validate()
    return result