How to write a python file with command-line arguments

When someone else executes a python file that supports command-line arguments, and instantly feels tall and up, how do you write a Python script with command-line arguments? Without straining, here's a quick and easy way to learn how to get your own Python script to support command-line arguments.

First you need to know some of the functions of the SYS module in python:

ImportSYSPrint "The number of the Python program ' s argument:", Len (SYS.ARGV)Print "The value of every argument is", str (SYS.ARGV)#the file name of the above program sysargv.pypython sysargv.py argv1 argv2 argv3 argv4the number of Python program's Argument:5The value of every argument is['sysargv.py','argv1','Argv2','Argv3','argv4']

Second, the Python program uses command-line arguments, the necessary module, is the Getopt module, first look at a piece of code

getopt. getopt ( args, options[, long_options])

ImportGetoptargs='-a-b-cfoo-d bar A1 A2'. Split () args[' -A','- b','-cfoo','- D','Bar','A1','A2']optlist, args= Getopt.getopt (args,'abc:d:') optlist[(' -A',"'), ('- b',"'), ('- C','Foo'), ('- D','Bar')]args['A1','A2']

Using long_options

s ='--condition=foo--testing--output-file abc.def-x A1 A2'args=s.split () args['--condition=foo','--testing','--output-file','Abc.def','- x','A1','A2']optlist, args= Getopt.getopt (args,'x', ['condition=','output-file=','Testing']) optlist[('--condition','Foo'), ('--testing',"'), ('--output-file','Abc.def'), ('- x',"')]args['A1','A2']

Finally, an example of the actual combat!

ImportGetopt,sysdefMain ():Try: Opts,args=getopt.getopt (sys.argv[1:],"hi:o:v",[" Help","infile=","outfile="])    exceptgetopt. Getopterror as Error:PrintStr (Error) Usage () Sys.exit (2) infile=None Output=None verbose=False forKey,valueinchopts:ifkey=="- v": Verbose=TrueelifKeyinch("- H","--help"):            Print "sysargv.py-i <inputfile> o <outputfile>"            Print "or sysargv.py--infile <inputfile>--outfile <outputfile>"        elifKeyinch("- I.","--infile"): infile=valueelifKeyinch("- o","--outfile"): Output=valuePrint "Inputfile:", infilePrint  "outputfile:", OutputPrintverboseif __name__=="__main__": Main ()

Test results:

C:\python27>python sysargv.py--helpsysargv.py-I <inputfile>-o <outputfile>orsysargv.py--infile <inputfile>--outfile <outputfile>inputfile:noneoutputfile:nonefalsec:\python27>python sysargv.py-hsysargv.py-I <inputfile>-o <outputfile>orsysargv.py--infile <inputfile>--outfile <outputfile>inputfile:noneoutputfile:nonefalsec:\python27>python Sysargv.py-i"Inputfile1"-O"Ouputfile2"inputfile:inputfile1outputfile:ouputfile2falsec:\python27>python Sysargv.py-i"Inputfile1"inputfile:inputfile1outputfile:nonefalsec:\python27>python Sysargv.py-o"Outputfile1"inputfile:noneoutputfile:outputfile1falsec:\python27>python Sysargv.py-o"Outputfile1"-vinputfile:noneoutputfile:outputfile1truec:\python27>python sysargv.py--infile"Inputfile"--outfile"Outputfile1"-vinputfile:inputfileoutputfile:outputfile1True

How to write a python file with command-line arguments