CommandLineParser (LenientPosixParser) doesn't recognize escaped double quote-CodePudding

Sorry I'm not an expert in python. Could someone explain me the behavior of the following code:

import sys

def send_cmd():

    param = r'--password="some\"pass"'

    print >> sys.stdout, param

    cmd = [
        '--adminName', 'admin',
        param,
        '--host', '127.0.0.1',
    ]

    print >> sys.stdout, cmd

if __name__ == "__main__":
    send_cmd()

The output that I get is the following:

--password="some\"pass"
['--adminName', 'admin', '--password="some\\"pass"', '--host', '127.0.0.1']

So when I assign raw value to the variable I get a single backslash, but when I put this var to array, it converts string to have double backslashes. But I would want to keep the value as it is - raw with a single backslash. How can I achieve this?

Thanks.

UPD:

The actual issue happens when I try to get password value in Java application. Python passes cmd to java in the form:

jar javaApp --adminName admin --password="some\\"pass"--host 127.0.0.1

And inside java application I use org.apache.commons.cli.CommandLine.getOptionValue("--password") Which returns me "some(double backslash)"pass" and that java cannot escape double quote

UPD2:

Ok, so it turns out that python is not an issue actually. The problem is that CommandLineParser (LenientPosixParser) cannot correctly parse argument passed with escape character. So when I pass to command line:

--password "some\"pass"

CommandLineParser returns "some"pass" value without trimming surrounding quotes and is not escaping double quote char.

CodePudding user response：

Python does not keep track if the string was initially defined with the r prefix.

The value is always the same, it is just a matter of the representation when you print the value.

Compare:

>>> param = r'--password="some\"pass"'
>>> param
'--password="some\\"pass"'
>>> print(param)
--password="some\"pass"
>>> print(repr(param))
'--password="some\\"pass"'
>>> param == r'--password="some\"pass"'
True
>>> param == '--password="some\\"pass"'
True

CodePudding user response：

I don't know why it does this but you can do it using for loop iterate through cmd and output each string

for i in cmd:
    sys.stdout.write(i ' ')