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There are many libraries and modules in Python that can help us parse command line parameters, among which argparse is a commonly used module. The argparse module provides a simple and flexible way to handle command line arguments, making it easy to write command line tools. This article explains how to use the argparse module in Python 2.x to parse command line arguments and provides some code examples.
argparse
package, so we need to use the import argparse
statement to import the module. parser = argparse.ArgumentParser()
parser.add_argument('input', help='输入文件名') parser.add_argument('-o', '--output', help='输出文件名') parser.add_argument('-v', '--verbose', action='store_true', help='详细输出')
The above code gives three examples:
input
is a required parameter, which represents the input file name. We can access the value of this parameter through args.input
. output
is an optional parameter, which represents the output file name. We can access the value of this parameter through args.output
. verbose
is an optional parameter, which indicates whether to output detailed information. When the command line contains -v
or --verbose
, the value of args.verbose
is True
, otherwise it is False
. args = parser.parse_args()
if args.output: # 输出文件名可用时,执行相应的操作 print('输出文件名:', args.output) if args.verbose: # 输出详细信息可用时,执行相应的操作 print('详细输出')
In the above code, we use the if statement to check whether the command line parameters exist. Depending on whether the parameter is present or not, we can perform different operations.
import argparse parser = argparse.ArgumentParser() parser.add_argument('input', help='输入文件名') parser.add_argument('-o', '--output', help='输出文件名') parser.add_argument('-v', '--verbose', action='store_true', help='详细输出') args = parser.parse_args() print('输入文件名:', args.input) if args.output: print('输出文件名:', args.output) if args.verbose: print('详细输出')
The above code will output corresponding information according to the status of the command line parameters. For example, executing the command python myscript.py input.txt -o output.txt -v
will output the following results:
输入文件名: input.txt 输出文件名: output.txt 详细输出
By using the argparse module, we can write command line tools more conveniently , and provide users with a good command line interaction experience. I hope this article can help everyone understand and use the argparse module.
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