How to use the pyyaml.lib.yaml.emitter.ScalarAnalysis function in PyYAML

def analyze_scalar(self, scalar):

        # Empty scalar is a special case.
        if not scalar:
            return ScalarAnalysis(scalar=scalar, empty=True, multiline=False,
                    allow_flow_plain=False, allow_block_plain=True,
                    allow_single_quoted=True, allow_double_quoted=True,
                    allow_block=False)

        # Indicators and special characters.
        block_indicators = False
        flow_indicators = False
        line_breaks = False
        special_characters = False

        # Whitespaces.
        inline_spaces = False          # non-space space+ non-space
        inline_breaks = False          # non-space break+ non-space
        leading_spaces = False         # ^ space+ (non-space | $)
        leading_breaks = False         # ^ break+ (non-space | $)
        trailing_spaces = False        # (^ | non-space) space+ $

allow_flow_plain = allow_block_plain =  \
            allow_single_quoted = allow_block = False

        # We don't emit multiline plain scalars.
        if line_breaks:
            allow_flow_plain = allow_block_plain = False

        # Flow indicators are forbidden for flow plain scalars.
        if flow_indicators:
            allow_flow_plain = False

        # Block indicators are forbidden for block plain scalars.
        if block_indicators:
            allow_block_plain = False

        return ScalarAnalysis(scalar=scalar,
                empty=False, multiline=line_breaks,
                allow_flow_plain=allow_flow_plain,
                allow_block_plain=allow_block_plain,
                allow_single_quoted=allow_single_quoted,
                allow_double_quoted=allow_double_quoted,
                allow_block=allow_block)