Python : 想要使用在 python 中传递的命令行参数，作为将在 python 脚本中执行的另一个命令的参数

Question

I am trying to write a python script where in the argument that is passed to this script, needs to be used as an argument to a command that will be executed in this script. Executing this script on cygwin

eg:- x.py file1

inside x.py script:

file = sys.argv[1]

data = os.popen('ar t file').read()

when this command is executed the value of file is not taken(ie file1),rather the 'file' variable is being considered as a file, and hence throws an error:filename 'file' cannot be found.Is it possible to pass the value of file as an argument to this command.

Thanks, Akhilesh

Answer 1

This is nothing to do with command arguments or passing them on, but a basic misunderstanding of strings. You have a hard-coded string containing the word "file", you are not actually passing in the value of the file variable anywhere. You can use string substitution:

data = os.popen('ar t {}'.format(file)).read()

or

data = os.popen('ar t %s' % file).read()