The argparse module provides a convenient interface to handle command-line arguments. It displays the generic usage of the program, help, and errors.
The parse_args() function of the ArgumentParser class parses arguments and adds value as an attribute dest of the object. dest identifies an argument.
dest attribute of a positional argument equals the first argument given to the add_argument() function.dest attribute equals the first long option string without --. Any subsequent - in the long option string is converted to _.dest equals the first short option string without -.For an argument
foo, a short option can be of the type-f, and a long option is of the--footype.
The following example demonstrates how the dest keyword is attributed to arguments.
foobar in the program below, is positional. dest is equal to the first argument supplied to the add_argument() function, as illustrated.radius_circle, is optional. A long option string --radius supplied to the add_argument() function is used as dest, as illustrated.-x, is used for its dest attribute.dest attribute can be set manually by specifying the value of dest in the arguments of add_argument().import mathimport argparse#create an ArgumentParser objectparser = argparse.ArgumentParser()#Add arguments#positional argumentparser.add_argument('foobar')#optional argument 1parser.add_argument('-r', '--radius-circle')# optional argument 2parser.add_argument('-x', '-y')parser.add_argument('-n','--newarg', dest = 'new' )obj = parser.parse_args('9 -r 1 -x 2 -n 5'.split())print(obj)
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