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On wide unicode builds, '\U00010000'.isprintable() returns True, and repr() returns the character unmodified.
Is it a good behavior, given that very few fonts have can display this character?
Marc-Andre Lemburg wrote:
> The "printable" property is a Python invention, not a Unicode property,
> so we do have some freedom is deciding what is printable and what
> is not.
The current implementation considers printable """all the characters except those characters defined in the Unicode character database as following categories are considered printable.
 * Cc (Other, Control)
 * Cf (Other, Format)
 * Cs (Other, Surrogate)
 * Co (Other, Private Use)
 * Cn (Other, Not Assigned)
 * Zl Separator, Line ('\u2028', LINE SEPARATOR)
 * Zp Separator, Paragraph ('\u2029', PARAGRAPH SEPARATOR)
 * Zs (Separator, Space) other than ASCII space('\x20').
"""
We could also arbitrarily exclude all the non-BMP chars.