本文研究的主要是Python编程argparse的相关内容，具体介绍如下。
#aaa.py
#version 3.5
import os #这句是没用了，不知道为什么markdown在编辑代码时，不加这一句，就不能显示代码高亮[汗]
import argparse
parser = argparse.ArgumentParser(description='Process some integers...') #初始化一个分析器
#parser.add_argument(中的参数)
#__init__(self, option_strings, dest, nargs=None, const=None, default=None, type=None, choices=None, required=False, help=None, metavar=None)
parser.add_argument('integers',metavar='N',type=int,nargs='+',
help='an integer for the accumulator')
#这是一个添加【位置参数】
#第一个参数是自定义的参数名，在代码中用来计算的（parser.parse_args().integers*2）
parser.add_argument('--sum',dest='accumulate',action='store_const',
const=sum,default=max,
help='sum the integers(default:find the max)')
#这是一个添加【可选参数】
#第一个参数是自定义的参数【在代码中的使用parser.parse_args().sum】【在系统命令行中的使用：>python aaa.py --sum
args = parser.parse_args()
print(args) #Namespace(accumulate=<built-in function sum>, integers2=[1, 2, 3, 4])
print(args.integers) #integers要与上面的对应
print(args.accumulate(args.integers)) #accumulate要与上面的对应在系统命令行中进行参数调用结果如下：
D:\Program Files (x86)\Python35>python aaa.py -h usage: aaa.py [-h] [--sum] N [N ...]
Process some integers...
positional arguments: N an integer for the accumulator
optional arguments: -h, --help show this help message and exit --sum sum the integers(default:find the max)
D:\Program Files (x86)\Python35>python aaa.py 1 2 3 4 --sum Namespace(accumulate=<built-in function sum>, integers2=[1, 2, 3, 4]) [1, 2, 3, 4] 10
D:\Program Files (x86)\Python35>python aaa.py 1 2 3 4 Namespace(accumulate=<built-in function max>, integers2=[1，2，3，4]) [1, 2, 3, 4] 4
在python交互模式下运行结果如下：
附件
Keyword Arguments: | | - option_strings -- A list of command-line option strings which | should be associated with this action. | | - dest -- The name of the attribute to hold the created object(s) | | - nargs -- The number of command-line arguments that should be | consumed. By default, one argument will be consumed and a single | value will be produced. Other values include: | - N (an integer) consumes N arguments (and produces a list) | - '?' consumes zero or one arguments | - '*' consumes zero or more arguments (and produces a list) | - '+' consumes one or more arguments (and produces a list) | Note that the difference between the default and nargs=1 is that | with the default, a single value will be produced, while with | nargs=1, a list containing a single value will be produced. | | - const -- The value to be produced if the option is specified and the | option uses an action that takes no values. | | - default -- The value to be produced if the option is not specified. | | - type -- A callable that accepts a single string argument, and | returns the converted value. The standard Python types str, int, | float, and complex are useful examples of such callables. If None, | str is used. | | - choices -- A container of values that should be allowed. If not None, | after a command-line argument has been converted to the appropriate | type, an exception will be raised if it is not a member of this | collection. | | - required -- True if the action must always be specified at the | command line. This is only meaningful for optional command-line | arguments. | | - help -- The help string describing the argument. | | - metavar -- The name to be used for the option's argument with the | help string. If None, the 'dest' value will be used as the name.
总结
以上就是本文关于Python编程argparse入门浅析的全部内容，希望对大家有所帮助。感兴趣的朋友可以继续参阅本站其他相关专题，如有不足之处，欢迎留言指出。感谢朋友们对本站的支持！