linux - How to return a value from a shell script in a python script -

I have a dragon script that requires a value from a shell script.

(A.sh):

  #! / Bin / bash return_value () {value = $ (/ / some UNIX commands) "$ value"} return = return_value   
 The following is the Python script:  
  Reply to Subprocess Import = Subprances Cole ([AK / A.SÃÆ'à ¢ â,¬Å¡Ãƒâ € šÃ, · ??) Print ("Answer is% s% Answer")   
 But its work Do not have to. Error "import error: no module subprocess" I think my verison (Python 2.3.4) is very old. Is there any substitute for subprocess in this case ??  check_output :  
  import reply to subprocess = subprocess. Checkoutout (['./.sh']) Print ("Answer is {}". Format (Answer))   
  Support on subprocess.check_output   
  & gt; & Gt; & Gt; Print subprocessation. Run the command with check-output .__ doc__ arguments and return its output as a byte string.   
 Demo:  
  & gt; & Gt; & Gt; Import sub process & gt; & Gt; & Gt; Answer = subprocess.check_output (['. /.sh']) & gt; & Gt; & Gt; 'Hello World!' Reply to! \ N '& gt; & Gt; & Gt; Print ("Answer is {}". Format (Answer)) Answer Hello World!   
  a.sh :  
  #! / Bin / bash STR = "Hello World!" ATO $ STR