Difference Between Whole String Command And List Of Strings In Popen

I found most of the programmers suggest use list of strings to represent the command in popen. However, in my own project, I found a whole string works in more cases. For example,

Solution 1:

The second should not have a shell=True parameter. Instead, it should be: subprocess.Popen(['pgrep', '-f', '"\./run"'], stdout=subprocess.PIPE).wait().

The shell parameter sets whether or not to execute the command in a separate shell. That is, if a new shell should be spawned just to execute the command, which must be interpreted by the shell before it can be run.

When providing a list of strings, however, this does not spawn a second shell, and thus is (minimally) faster. It is also better to use for processing variable input, because it avoids string interpolation.

See: https://stackoverflow.com/a/15109975/1730261