Python Learning argparse Module

First, Introduction:

Argparse is a standard module used by Python to parse command-line arguments and options in place of obsolete optparse modules. The Argparse module is used to parse command-line arguments, such as Python parsetest.py input.txt output.txt--user=name--port=8080.

Second, the use of the steps:

1:import Argparse

2:parser = Argparse. Argumentparser ()

3:parser.add_argument ()

4:parser.parse_args ()

Explanation: Import the module first, then create a parse object, and then add the command line arguments and options you want to follow to the object, each Add_argument method corresponds to a parameter or option that you want to follow, and the last call to the Parse_args () method to parse it; , the following is a brief explanation of steps 2 and 3.

Third, Method Argumentparser (Prog=none, Usage=none,description=none, Epilog=none, Parents=[],formatter_class=argparse. Helpformatter, prefix_chars= '-', Fromfile_prefix_chars=none, argument_default=none,conflict_handler= ' error ', add_ Help=true)

These parameters all have default values, which are printed when parser.print_help () is called or when the program is run because the parameter is incorrect (the Python interpreter actually calls the Pring_help () method). It is generally only necessary to pass the description parameter, as above.

Iv. Method Add_argument (Name or flags ...) [, Action] [, Nargs] [, Const] [, Default] [, type] [, Choices] [, Required] [, help] [, Metavar] [, Dest])

which

Name or Flags: command-line parameter name or option, such as address above or-p,--port. If the command line argument is not given and no defualt is set, an error occurs. However, if it is an option, it is set to none

Nargs: The number of command-line arguments, generally using wildcard notation, where, '? ' means only one, ' * ' means 0 to more, ' + ' means at least one

Default: Defaults

Type: The types of parameters, which are string by default, type float, int, and so on

Help: Similar to the parameters in the Argumentparser method, and the same situations arise

1 ImportArgparse2 3 defParse_args ():4Description = Usage:%prog [options] poetry-file5 6This isthe Slow Poetry Server, blocking edition.7 Run It like this:8 9 python slowpoetry.pyTen  OneIf you areinchThe base directory of the twisted-Intro Package, A You could run it as this: -  -Python blocking-server/slowpoetry.py poetry/Ecstasy.txt the  -To serve up John donne's Ecstasy, which I know you want to do. -  -  +Parser = Argparse. Argumentparser (Description =description) -      +Help =The addresses to connect. AParser.add_argument ('addresses', Nargs ='*', help =Help ) at  -Help = the filename to operate on. Default ispoetry/Ecstasy.txt -Parser.add_argument ('filename', help=Help ) -  -Help =The port to listen on. Default to a random available port. -Parser.add_argument ('- P',--Port', Type=int, Help=help) in  -Help = The interface-listen on. Default islocalhost. toParser.add_argument ('--iface', Help=help, default='localhost') +  -Help =The number of seconds between sending bytes. theParser.add_argument ('--delay', Type=float, Help=help, default=.7) *  $Help =The number of bytes to send at a time.Panax NotoginsengParser.add_argument ('--bytes', Type=int, Help=help, default=10) -  theargs =Parser.parse_args (); +     returnargs A  the if __name__=='__main__': +args =Parse_args () -      $      forAddressinchargs.addresses: $         Print 'The address is:%s.'%Address -      -     Print 'The filename is:%s.'%Args.filename the     Print 'The port is:%d.'%Args.port -     Print 'The interface is:%s.'%Args.ifaceWuyi     Print 'The number of seconds between sending bytes:%f'%Args.delay the     Print 'The number of bytes to send at a time:%d.'%args.bytes - 

Run the script: Python test.py--port 10000--delay 1.2 127.0.0.1 172.16.55.67 poetry/ecstasy.txt

The output is:

The address is:127.0.0.1.
The address is:172.16.55.67.
The filename is:poetry/ecstasy.txt.
The Port is:10000.
The interface is:localhost.
The number of seconds between sending bytes:1.200000
The number of bytes to send at a time:10.

Python Learning argparse Module