Python -- Command Line Parameter Parsing Demo, python -- demo

Python -- Command Line Parameter Parsing Demo, python -- demo

When writing a program without an operation interface, the most annoying issue is Parameter Parsing, especially for many parameters. Here is a small Demo to share with you:

 1 # -*- coding:utf8 -*- 2 import os 3 import datetime 4 import sys 5 from optparse import OptionParser 6  7  8 def get_user_paras(): 9     try:10         opt = OptionParser()11         opt.add_option('--host_ip',12                        dest='host_ip',13                        type=str,14                        help='the ip of the check host')15         opt.add_option('--run',16                        action="store_true",17                        dest="is_run",18                        default=False,19                        help="run the scripts")20         opt.add_option('--view',21                        action="store_false",22                        dest="is_run",23                        default=False,24                        help="only view but not run the scripts")25         opt.add_option('--show_type',26                        dest="show_type",27                        type=int,28                        default=0,29                        help="0 or 1, 0 only show the simple data, 1 show the full data")30         (options, args) = opt.parse_args()31         is_valid_paras = True32         error_messages = []33         host_ip = options.host_ip34         is_run = options.is_run35         show_type = options.show_type36         if not host_ip:37             error_messages.append("host_ip must be set;")38             is_valid_paras = False39         if show_type not in [0, 1]:40             error_messages.append("show_type only can be 0 or 1;")41             is_valid_paras = False42 43         if is_valid_paras:44             user_paras = {"host_ip": host_ip, "is_run": is_run, "show_type": show_type}45             return user_paras46         else:47             for error_message in error_messages:48                 print(error_message)49             return None50     except Exception as ex:51         print("exception :{0}".format(str(ex)))52         return None53 54 55 def main():56     user_paras = get_user_paras()57     if user_paras is None:58         sys.exit(0)59     info = "host_ip:{0}, is_run:{1}, show_type:{2}"60     info = info.format(user_paras["host_ip"],61                        user_paras["is_run"],62                        user_paras["show_type"])63     print(info)64 65 66 if __name__ == '__main__':67     main()

 

When OptionParser is used, the -- help and-h parameters are automatically added, and parameter help is automatically generated, for example:

 

For code:

opt.add_option('--run',               action="store_true",               dest="is_run",               default=False,               help="run the scripts")

-- Run indicates the parameter name.

Action indicates how to process the parameter values. store/store_true/store_false is commonly used, and store is the literal meaning. store_true means that True is passed to the parameter as the parameter value, store_false pass False as the parameter value to the parameter

Dest indicates the name of the parsed command line parameter,

In the code above, -- run is passed in as a command line parameter. Because action is store_true, the parameter value is True. The parsed parameter is is_run, and the value is (options, args) = opt. after parse_args () is assigned a value, options can be used. is_run.

 

More help: https://docs.python.org/2/library/optparse.html

##=================================================== ============================== ##

When there are many parameters or large parameter values, I prefer to use the parameter configuration file for simple and convenient editing. For example, to create a run_config.py file:

# -*- coding:utf8 -*-# run configclass RunConfig(object):    is_run = True    show_status = 1    host_ip = "192.167.1.1"    run_scripts = """SELECT *FROM TB001WHERE ID >1000AND C1<300"""

Then access it in other files:

# -*- coding:utf8 -*-from run_config import RunConfigdef main():    print("is_run:{0},  host_ip:{1}".format(RunConfig.is_run,RunConfig.host_ip))    print("run_scripts:{0}".format(RunConfig.run_scripts))if __name__ == '__main__':    main()

Simple and rude, not so troublesome. What does the leopard do!

 

##=================================================== ================== ##