DENDROLOGY

Detailed explanation-1: -Setting the shell argument to a true value causes subprocess to spawn an intermediate shell process, and tell it to run the command. In other words, using an intermediate shell means that variables, glob patterns, and other special shell features in the command string are processed before the command is run.

Detailed explanation-2: -By default, running subprocess. Popen with shell=True uses /bin/sh as the shell. If you want to change the shell to /bin/bash, set the executable keyword argument to /bin/bash .