Jean-Michel Pichavant jeanmichel at
Tue Nov 9 14:31:59 CET 2010

Seebs wrote:
> I have an existing hunk of Makefile code:
> 	CPPFLAGS = "$(filter -D* -I* -i* -U*,$(TARGET_CFLAGS))"
> For those not familiar with GNU makeisms, this means "assemble a string
> which consists of all the words in $(TARGET_CFLAGS) which start with one
> of -D, -I, -i, or -U".  So if you give it
> 	foo -Ibar baz
> it'll say
> 	-Ibar
> I have a similar situation in a Python context, and I am wondering
> whether this is an idiomatic spelling:
> 	' '.join([x for x in target_cflags.split() if re.match('^-[DIiU]', x)])
> This appears to do the same thing, but is it an idiomatic use of list
> comprehensions, or should I be breaking it out into more bits?
> You will note that of course, I have carefully made it a one-liner so I
> don't have to worry about indentation*.
> -s
> [*] Kidding, I just thought this seemed like a pretty clear expression.
One pythonic way to do it, is to use an option parser.

optparse (or argparse if python > 2.7)


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