Redirecting terminal output into a variable

Help to understand the redirect CMD output to the variable, because The variable is assigned only the Exit_code of the process. For clarity, there are a couple of examples: an example

   impress  sys, os command =  "" Tasklist ""  result1 = os.system (commander)   print  (result1) # at the exit 0      
 Example 2 
    CommAND =  "" Tasklist & gt; TEMP.TXT ""  result2 = os.system (commander)   print  (result2) # at the output of the output. 0    with   open  ( 'r' )  as  f:  result2 = f.read ()   print  (result2) # will derive the result of the execution of TASKLIST    

  sys.stout =  open  ( 'TEMP.TXT' ,  'w' ) #write 0 in the file  os.system ( '' 'Tasklist' ) #The result of the execution itself will be displayed in the Intertator  file =  open  ( '' 'Temp.txt' ,  '`` ). Read ()   print  (file) # will display 0