with open("output.txt", "r") as f:
    print(f.read())
Pipe output to another subprocess
  
Make two commands, and then run two subprocesses
  
Pipe out from process 1
    
Pipe in to process 2
  
Make two commands:
cmd1 = ['ls'] #list my files
cmd2 = ['wc', '-l'] #count number of lines
import os
os.system('echo this is os system') # runs the echo comnmand
os.system("bash please.sh") # runs please.sh with bash
os.system("python chips.py") # runs chips.py with python