[Python-Dev] Defining a path protocol

[INADA Naoki]

FYI, Ruby's Pathname class doesn't inherit String.

http://ruby-doc.org/stdlib-2.1.0/libdoc/pathname/rdoc/Pathname.html

Ruby has two "convert to string" method.
`.to_s` is like `__str__`.
`.to_str` is like `__index__` but for str.  It is used for implicit
conversion.

File.open accepts any object implements `.to_str`.
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