Python command-line arguments

First, getopt

Opts,args = getopt.getopt ([command line argument list], short option, [long list of options]), the third argument can be omitted
A colon after the short option name (:) indicates that the option must have additional parameters. If not:-ABC is equivalent to-a-b-C; If a has:,-ABC is equivalent to-a BC.
An equal sign (=) after the long option name indicates that the option must have additional parameters.
Returns opts and args.
OPTs is a parameter option and its value tuple [('-O ', ' value '), ('--option ', '),...],opts can have duplicates
Args is a command-line input that removes useful arguments [' A1 ', ' A2 ',...]

1 Importgetopt, sys2 3 defMain ():4     Try:5opts, args = Getopt.getopt (sys.argv[1:],"ho:v", [" Help","output="])6     exceptgetopt. Getopterror as err:7         #Print help information and exit:8         PrintSTR (ERR)#Would print something like "option-a not recognized"9 usage ()TenSys.exit (2) OneOutput =None AVERBOSE =False -      forO, ainchopts: -         ifo = ="- v": theVERBOSE =True -         elifOinch("- H","--help"): - usage () - sys.exit () +         elifOinch("- o","--output"): -Output =a +         Else: A             assertFalse,"unhandled option" at     # ... -  - if __name__=="__main__": -Main ()

Second, Argparse

Third, Optparse

2.7 Start scrapping

Iv. docopt

Non-standard library

Python command-line arguments