Why Does subprocess.Popen Fail When Passing Variables as Arguments, and How Can I Fix It?

Troubleshooting Subprocess.Popen Argument Passing Discrepancies

When attempting to pass variables to subprocess.Popen() for script execution, users may encounter difficulties if the arguments are stored in variables. To address this issue, let's delve into the problem and provide a solution.

The Issue:

The initial approach involves passing arguments directly from the variables, like this:

However, this method fails to execute the command successfully.

The Solution:

The key to resolving this issue lies in removing shell=True. When set to True, the arguments to Popen() are treated differently on Unix systems,导致了错误的解析。 By dropping shell=True, we can directly pass the arguments as a list:

Bypassing the shell eliminates the previous parsing issue and allows for proper execution of the command.

Security Considerations:

It's important to note that setting shell=True when dealing with external input is discouraged due to potential security hazards. For this reason, it's recommended to avoid using shell=True and instead adopt the method outlined above for passing arguments to Popen().

The above is the detailed content of Why Does subprocess.Popen Fail When Passing Variables as Arguments, and How Can I Fix It?. For more information, please follow other related articles on the PHP Chinese website!