Eric Smith <[email protected]> added the comment:
I agree with David.
Here's an example of using such a subclass. It extends the format string for
strings to begin with an optional 'u' or 'l':
-----------------------
class U(str):
def __format__(self, fmt):
if fmt[0] == 'u':
s = self.upper()
fmt = fmt[1:]
elif fmt[0] == 'l':
s = self.lower()
fmt = fmt[1:]
else:
s = str(self)
return s.__format__(fmt)
name = 'Hervé Cauwelier'
print('{0:u*^20} {0:l*^20} {0:*^20}'.format(U(name)))
-----------------------
It produces:
**HERVÉ CAUWELIER*** **hervé cauwelier*** **Hervé Cauwelier***
----------
nosy: +eric.smith
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<http://bugs.python.org/issue10660>
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