In my Python Pipelines program I have the following
opts = {
'characters' : (lambda rec, tot: tot + len(rec), 0),
'words' : (lambda rec, tot: tot + len(rec.split()), 0),
'lines' : (lambda rec, tot: tot + 1, 0),
'minline' : (lambda rec, tot: min(len(rec), tot), 999999999),
'maxline' : (lambda rec, tot: max(len(rec), tot), 0)
}
The user specifies option(s) (the dictionary keys). Thje program then
creates a class instance for each option, passing the corresponding
function as a class initialization parameter:
for option in options:
func, initTotal = Count.opts.get(option , 0)
if func:
ctr = Count.CounterClass(func, spec, initTotal)
it made lots of sense to me to code these as lambdas.
The alternatve would have been 4 defs: (4 more lines of code and more
indirection in code reading).
def char(rec, tot): return tot + len(rec)
etc
--
Bob Gailer
919-636-4239
Chapel Hill NC
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