How did you create the string? Why is your indentation level inconsistent? Perl module YAML also complains 
YAML Error: Inconsistent indentation level
   Code: YAML_PARSE_ERR_INCONSISTENT_INDENTATION
   Line: 6
   Document: 1

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In reply to Re^3: python YAML output, perl Loader, which version? by Anonymous Monk
in thread python YAML output, perl Loader, which version? by mgwmgw

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