Terry J. Reedy <tjre...@udel.edu> added the comment:

To answer Mark, even though no longer nosy: In general, sequence methods 
.count, .index, and .__contains__ take sequence members and only members as 
arguments.  Unicode sequences are exceptional because codepoints are not Python 
objects, so string subsequences must be used instead.  Byte-like sequences are 
also exceptional in that both members and subsequences are accepted for these 
methods.

String-like sequence methods .split and .partition take subsequences as 
arguments.  I think the doc should make this clearer.

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<https://bugs.python.org/issue20047>
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