"bob gailer" <[EMAIL PROTECTED]> wrote
In my Python Pipelines program for the Count stage I have:
opts = {
'characters' : lambda rec, tot: tot + len(rec),
'words' : lambda rec, tot: tot + len(rec.split()),
'lines' : lambda rec, tot: tot + 1,
'minline' : lambda rec, tot: min(len(rec), tot),
'maxline' : lambda rec, tot: max(len(rec), tot),
}
def characters(rec,tot): return tot + len(rec)
def words(rec,tot): return tot + len(rec.split())
etc...
Not many more characters than using lambda and
avoids the need for the dictionary lookup:
instead of
w = opts['words'](r,c)
just use:
w = words(r,c)
If you need the dictionary for dynamic lookup then just insert
the functions intop the dict:
opts = {
'characters' : characters,
'worsds' : words,
etc...
}
Consider how many more lines of code it would take if I had to use
defs.
More or less by definition a Python lambda expression can
be replaced with a one-liner function.
Consider how readable it is to have the expressions all in one
place.
In this case I'm not sure the gain is huge, its largely a matter of
personal preference.
Alan G.
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