>>>>> "GW" == Greg Ward <gward@cnri.reston.va.us> writes:
GW> However, one could certainly envision a world where Python
GW> issues runtime warnings. If my time machine were working, I'd
GW> zip back and suggest to Guido that mistakes with the %
GW> operator should issue warnings rather than raising exceptions.
GW> (Ignore the language philosophy issue and presume this would
GW> be worthwhile.)
Moderately off-topic, but since you brought it up, here's what I use
in Mailman (since site-admins can make mistakes editing their
templates, which contains %(keys)s... we'd like to make Mailman more
robust so it doesn't totally crap out when that happens).
We (hopefully) always interpolate with a SafeDict instead of a raw
Python dictionary.
-Barry
class SafeDict(UserDict):
"""Dictionary which returns a default value for unknown keys.
This is used in maketext so that editing templates is a bit more robust.
"""
def __init__(self, d):
# optional initial dictionary is a Python 1.5.2-ism. Do it this way
# for portability
UserDict.__init__(self)
self.update(d)
def __getitem__(self, key):
try:
return self.data[key]
except KeyError:
if type(key) == StringType:
return '%('+key+')s'
else:
return '<Missing key: %s>' % `key`
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