How to handle calling functions from cli
I have a bunch of sub routines that run independently to perform various system
checks on my servers. I wanted to get an opinion on the following code I have
about 25 independent checks and I'm adding the ability to disable certain
checks that don't apply to certain hosts.
m = { 'a': 'checkDisks()',
'b': 'checkMemSize()',
'c': 'checkBondInterfaces()'
}
parser = argparse.ArgumentParser(description='Parse command line args.')
parser.add_argument('-x', action=store, dest=d)
r = parser.parse_args(sys.argv[1:])
runlist = [ c for c in m.keys() if c not in r.d ]
for runable in runlist:
eval(m[runable])
I'm using temp variable names for now until I find an approach I like.
Is this a good approach ? It doesn't look too pretty and to be honest feels
awkward?
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Re: How to handle calling functions from cli
On Fri, Feb 24, 2012 at 2:16 PM, Rodrick Brown rodrick.br...@gmail.com wrote:
I have a bunch of sub routines that run independently to perform various
system checks on my servers. I wanted to get an opinion on the following code
I have about 25 independent checks and I'm adding the ability to disable
certain checks that don't apply to certain hosts.
m = { 'a': 'checkDisks()',
'b': 'checkMemSize()',
'c': 'checkBondInterfaces()'
}
parser = argparse.ArgumentParser(description='Parse command line args.')
parser.add_argument('-x', action=store, dest=d)
r = parser.parse_args(sys.argv[1:])
runlist = [ c for c in m.keys() if c not in r.d ]
for runable in runlist:
eval(m[runable])
I'm using temp variable names for now until I find an approach I like.
Is this a good approach ? It doesn't look too pretty and to be honest feels
awkward?
You should make use of the fact that functions are first-class objects
in Python:
m = { 'a': checkDisks,
'b': checkMemSize,
'c': checkBondInterfaces }
# …
for runable in runlist:
m[runable]()
Cheers,
Chris
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Re: How to handle calling functions from cli
On Sat, Feb 25, 2012 at 9:16 AM, Rodrick Brown rodrick.br...@gmail.com wrote:
m = { 'a': 'checkDisks()',
'b': 'checkMemSize()',
'c': 'checkBondInterfaces()'
}
runlist = [ c for c in m.keys() if c not in r.d ]
for runable in runlist:
eval(m[runable])
It's a reasonable technique. Does have the downside that your
functions will be called in an unpredictable order, though. If that's
a problem, replace the dictionary with a tuple of tuples (and then
just take off the .items() in the list comp).
I would be inclined to avoid eval, especially if none of your
functions need parameters. Just hold references to the functions
themselves:
checks = {
'a': checkDisks,
'b': checkMemSize,
'c': checkBondInterfaces, # note that this comma is perfectly
legal - all these lines can be structured identically
}
[func[option]() for option,func in checks.items() if option not in r.d]
ChrisA
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