> > * For someone who understands exactly what they are doing, perhaps
$ma
> > is the intended placeholder -- why force them to uses braces:
> > ${ma}ñana.
>
> It also makes it more difficult to document. IOW, right now the PEP
and
> the documentation say that the first non-identifier character
terminates
> the placeholder. How would you word the rules with your change?
"""Placeholders must be a valid Python identifier (containing only ASCII
alphanumeric characters and an underscore). If an unbraced identifier
ends with a non-ASCII alphanumeric character, such as the latin letter n
with tilde in $mañana, then a ValueError is raised for the specious
identifier.
> My only problem with that is the interference that the 'mapping'
> argument presents. IOW, kwds can't contain 'mapping'.
To support a case where both a mapping and keywords are present, perhaps
an auxiliary class could simplify matters:
def substitute(self, mapping=None, **kwds):
if mapping is None:
mapping = kwds
elif kwds:
mapping = _altmap(kwds, mapping)
. . .
class _altmap:
def __init__(self, primary, secondary):
self.primary = primary
self.secondary = secondary
def __getitem__(self, key):
try:
return self.primary[key]
except KeyError:
return self.secondary[key]
This matches the way keywords are used with the dict().
Raymond
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