Python getopt detailed and simple examples

This article mainly introduces the Python getopt detailed and simple examples of relevant information, the need for friends can refer to the following

Python getopt detailed

Function Prototypes:

Getopt.getopt (args, shortopts, longopts=[])

Parameter explanation:

• Args:args is a list of parameters that need to be parsed. General use Sys.argv[1:], this can filter out the first parameter (PS: The first parameter is the name of the script, it should not be parsed as a parameter)

• Shortopts: Shorthand parameter list

• Longopts: Long parameter list

return value:

• OPTs: The parsed (option, value) list pair.

• Args: The list of remaining command-line arguments that are not part of the format information.

SOURCE Analysis

In the build system of the Android generation Ota, the Parseoptions function in the common.py file is used to parse the input parameters, so we can analyze the use of getopt by the implementation of the function.

The function source code is as follows:

def parseoptions (argv, docstring, extra_opts= "", extra_long_opts= (), Extra_option_handler=none): try:opts, args = Get Opt.getopt (argv, "hvp:s:x" + extra_opts, ["Help", "verbose", "path=", "signapk_path=", "extra_signapk_args=", "  Java_path= "," public_key_suffix= "," private_key_suffix= "," device_specific= "," extra= "] + list (extra_long_opts)) Except Getopt. Getopterror, Err:usage (docstring) print "* *", str (ERR), "* *" Sys.exit (2) path_specified = False for O, a in op Ts:if o in ("-H", "--help"): Usage (docstring) sys.exit () Elif O in ("-V", "--verbose"): Options.verb OSE = True elif o in ("-P", "--path"): Options.search_path = a elif o in ("--signapk_path",): Options.sign Apk_path = a elif o in ("--extra_singapk_args",): Options.extra_signapk_args = Shlex.split (a) elif O in ("--jav      A_path ",): Options.java_path = a else:if Extra_option_handler is None or not Extra_option_handler (O, a): Assert False, "uNknown option \ "%s\" "% (o,) os.environ[" PATH "] = (Os.path.join (Options.search_path," bin ") + os.pathsep + os.environ[" PA TH "]) return args

Where extra_option_handler can be understood as a function pointer, its function is also to parse OPTs's key-value pairs.

Extra_option_handler source code is as follows:

def option_handler (O, a):  if O in ("-B", "--board_config"):   pass  # deprecated  elif o in ("-K", "--package _key "):   Options.package_key = a  elif o in ("-I ","--incremental_from "):   Options.incremental_source = a  elif O In ("-w", "--wipe_user_data"):   Options.wipe_user_data = True  elif o in ("-N", "--no_prereq"):   Options.omit_prereq = True  elif o in ("-E", " --extra_script "):   options.extra_script = a  elif o in ("-a ","--aslr_mode "): If A in (' On '," on ","   true "," T Rue "," Yes "," yes "):    Options.aslr_mode = True   else:    options.aslr_mode = False  elif o in ("--worker_ Threads "):   options.worker_threads = Int (a)  else:   return False  return True

The parameters for the general generation of oat full-scale packages are argv as follows:

argv = ['-V ', '-P ', ' out/host/linux-xxx ', '-K ', ' build/target/product/security/testkey ', ' out/target/product/xxx/obj/ Packaging/target_files_intermediates/xxx-target_files.zip ', ' out/target/product/xxx/xxx_20150723.1340-ota.zip ']

First, the parameters are analyzed, and the short parameters include:

-v,-p,-k,

After parsing, the resulting results are as follows:

opts = [('-V ', ' '), ('-P ', ' out/host/linux-x86 '), ('-K ', ' Build/target/product/security/testkey ')]args =[' out/target/ Product/xxx/obj/packaging/target_files_intermediates/xxx-target_files.zip ', ' out/target/product/xxx/xxx_ 20150723.1340-ota.zip ']

Thank you for reading, hope to help everyone, thank you for the support of this site!