[issue43535] Make str.join auto-convert inputs to strings.

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> Of 721 uses of the join() method (excluding os.path.join()) 
> in the stdlib, only 10 need forceful stringification with 
> map(str, ...)

Thanks for looking a real world code.  I'm surprised that the standard library stats aren't representative of my experience, perhaps because I tend to write numeric code and do more output formatting than is used internally.

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