[issue13857] Add textwrap.indent() as counterpart to textwrap.dedent()

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

If such a function is added, I'd like the option to not indent empty lines: trailing spaces are often not a good idea.

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue13857>
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