"Python" Optparse

Optparse

First, you must import the Optionparser class to create a Optionparser object:

use add_option to define command-line arguments: -F   or   –file   are the long and short parameter names:

Finally, once you have defined all the command-line arguments, call Parse_args () to resolve the program's command line: You can also pass a command-line argument list to Parse_args (); otherwise, the default is to use Sys.argv[:1].

two values returned by Parse_args ():

• options, which is an object (Optpars. Values), which holds the command-line parameter value. As long as you know the command line parameter name, such as file, you can access its corresponding value: Options.file.
• args, which is a list made up of positional arguments.

From optparse import Optionparser  [...]  Parser = Optionparser ()  parser.add_option ("-F", "--file", dest= "filename",                    help= "write report to File", Metavar= "FILE")  parser.add_option ("-Q", "--quiet",                    action= "Store_false", dest= "verbose", Default=true,                    help= "Don ' t print status messages to stdout")    (options, args) = Parser.parse_args ()

<yourscript>--file=outfile-q  <yourscript>-f outfile--quiet  <yourscript>--quiet--file outfile  <yourscript>-q-foutfile  <yourscript>-qfoutfile

Add_option () parameter description:

Action: Storage method, divided into three kinds of store, Store_false, store_true

action is one of the parameters of the Parse_args () method, which indicates how optparse is handled when resolving to a command-line argument. Actions have a fixed set of values to choose from, the default is 'store ', which means that the command line parameter values are saved in the options object

Type: Types

By default, type is ' string '. As shown above, long parameter names are also optional. In fact, the dest parameter is also optional. If the Dest parameter is not specified, the value of the options object is accessed using the command line's parameter name.

The store also has two other forms: store_true and Store_false , which are used to handle cases with no values after the command line arguments. command-line arguments such as-v,-q: in this case, when parsing to '-V ', the options.verbose will be given a True value, and conversely, parsing to '-Q ' will be given a value of False.

Other actions are: Store_const , Append , Count , Callback .

Dest: Stored variables
Default: Defaults
Help: Helpful Information

The above commands are the same effect. In addition to this, Optparse also automatically generates command line help information for us:

<yourscript>-H  <yourscript>--help  #输出usage: <yourscript> [Options]    options:-    H ,--help            Show this help message and exit    -f file,--file=file write report to  file-    q,--quiet           don ' t P Rint status messages to stdout

"Python" Optparse