[Python-Dev] Re: 2.4a2, and @decorators
eppstein at ics.uci.edu
Tue Aug 3 20:52:22 CEST 2004
BTW, here's another use case I haven't seen suggested yet:
sub = re.compile(regexp).sub
return lambda func: lambda text: sub(func,text)
e.g. (example from some recent code of mine, redone as a decorator)
"""Insert space into camelcase regexp match."""
return m.group(0)+' '+m.group(0)[1:]
info.title = camelspace(info.basefilename)
Instead my current code defines a separate variable for the
re.compile().sub object, then later has to put this variable together
correctly with the undecorated camelspace function to perform the
substitution. Using decorators allows the sub and replacement function
to become merged into a single object with a more intuitive API.
(Also, my actual code uses more than one of these substitutions...)
I don't generally prefer to use explicit lambdas but expanding them out
with names makes the definition of substitution_for a lot longer without
much readability gain in my eyes.
Computer Science Dept., Univ. of California, Irvine
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