On Sun, 11 Oct 2015, Nicolas Goaziou wrote:

>
> What about the following:
>
>  ‘org-src-preserve-indentation’ By default, the value is ‘nil’, which
>       means that code blocks evaluated during export or tangled are
>       indented according to context, possibly altering leading
>       sequences of spaces and tab characters in the process. When
>       non-nil, indentation is relative to left column, and therefore,
>       not modified during export or tangling. This variable is
>       especially useful for tangling languages such as Python, in which
>       whitespace indentation in the output is critical.
>


I think that is correct.

Chuck