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How to know if optparse option was passed in the command line or as a default


How to know if optparse option was passed in the command line or as a default

By : user3862843
Date : January 02 2021, 06:48 AM
Any of those help Using python optparse.py, is there a way to work out whether a specific option value was set from the command line or from the default value. , Instead of the below boilerplate code:
code :


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Can Python's optparse display the default value of an option?

Can Python's optparse display the default value of an option?


By : user1389147
Date : March 29 2020, 07:55 AM
this one helps. Is there a way to make Python's optparse print the default value of an option or flag when showing the help with --help? , Try using the %default string placeholder:
code :
# This example taken from http://docs.python.org/library/optparse.html#generating-help
parser.add_option("-m", "--mode",
                  default="intermediate",
                  help="interaction mode: novice, intermediate, "
                       "or expert [default: %default]")
optparse doesn't collect all values passed to an option

optparse doesn't collect all values passed to an option


By : Hallstrom
Date : March 29 2020, 07:55 AM
I hope this helps . I'm working on a simple portscanner, and I want my Program to take two Options when executed by the command shell. In General it can only be executed from the shell since the options are absolutely required for the program. , Args are already split by whitespace, so you'll need to use
code :
tgtPorts = str(options.tgtPort).split(',')
checking if arg was passed when default is set with python optparse

checking if arg was passed when default is set with python optparse


By : Meuk
Date : March 29 2020, 07:55 AM
around this issue From this question linked in the comment: How to know if optparse option was passed in the command line or as a default
I was able to use this for my case in SCons:
code :
from SCons.Environment import Environment
from SCons.Script.SConsOptions import Parser

###################################################
# Determine number of Jobs
# start by assuming num_jobs was not set
opts_no_defaults = optparse.Values()
parser = Parser(MAIN_ENV._get_major_minor_revision(SCons.__version__))
__, args = parser.parse_args(values=opts_no_defaults)
opts = optparse.Values(parser.get_default_values().__dict__)
opts._update_careful(opts_no_defaults.__dict__)

# num_jobs wasn't specificed so let use the
# max number since the user doesn't seem to care
if not hasattr(opts_no_defaults, parser.get_option('--jobs').dest):
    NUM_CPUS = get_num_cpus()
    ColorPrinter().InfoPrint("Building with " + str(NUM_CPUS) + " parallel jobs")
    MAIN_ENV.SetOption("num_jobs", NUM_CPUS)
else:
    # user wants a certain number of jobs so do that
    ColorPrinter().InfoPrint(
        "Building with " + str(GetOption('num_jobs')) + " parallel jobs")
optparse NA default not being overwritten by command-line argument

optparse NA default not being overwritten by command-line argument


By : user3703734
Date : March 29 2020, 07:55 AM
help you fix your problem Looks like you need to use NA_real_ to specify the kind of NA to use in this context (https://stat.ethz.ch/R-manual/R-devel/library/base/html/NA.html).
code :
option_list <- list(
    make_option(c('--sample_p'), default=NA_real_, dest='sample_p', help='Sample probability of inclusion if randomly sampling records')
)
creating an array from a command line option (python::optparse)

creating an array from a command line option (python::optparse)


By : Hella Bands
Date : March 29 2020, 07:55 AM
it fixes the issue If you have Python 2.7+, you can use argparse module instead of optparse.
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