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