[issue9080] Provide list prepend method (even though it's not efficient)

[sorin]

sorin <sorin.sbarnea at gmail.com> added the comment:

+1 for adding it because it will make the code easier to read/understand.
Bad performance could be documented and it's related about internal representation.

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nosy: +sorin

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<http://bugs.python.org/issue9080>
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