argparse list

[Neal Becker]

I'm interested in using argparse to parse a string formatted as:

my_prog --option1=1,10,37

That is, a list of comma delimited values. I guess nargs almost does it,
but expects options to be space-delimited.

What would be the easiest approach?

 

[Peter Otten]

I'm interested in using argparse to parse a string formatted as:

my_prog --option1=1,10,37

That is, a list of comma delimited values. I guess nargs almost does it,
but expects options to be space-delimited.

What would be the easiest approach?

.... return map(int, value.split(","))
....

p = argparse.ArgumentParser()
p.add_argument("--option1", type=csv) and None
p.parse_args(["--option1=1,10,37"]) Namespace(option1=[1, 10, 37])
_.option1[0]

1

Peter

 

[Neal Becker]

... return map(int, value.split(","))
...

p = argparse.ArgumentParser()
p.add_argument("--option1", type=csv) and None
p.parse_args(["--option1=1,10,37"])

Thanks! But, why the 'and None'?

 

[Peter Otten]

import argparse
def csv(value):

... return map(int, value.split(","))
...

p = argparse.ArgumentParser()
p.add_argument("--option1", type=csv) and None
p.parse_args(["--option1=1,10,37"])

Thanks! But, why the 'and None'?

To hide the result of p.add_argument().

I'm not going to do it again

Peter

 

[Michele Simionato]

I'm interested in using argparse to parse a string formatted as:

my_prog --option1=1,10,37

That is, a list of comma delimited values.  I guess nargs almost does it,
but expects options to be space-delimited.

What would be the easiest approach?

In plac (http://pypi.python.org/pypi/plac) you would write the
following:

import plac

@plac.annotations(
option1=('option with comma separated values',
'option',
'o',
lambda x: x.split(',')))
def main(option1):
print option1

if __name__ == '__main__':
plac.call(main)