How to use export with Python on Linux

Question

I need to make an export like this in Python      export MY DATA  my export    I ve tried to do      - - python-mode - -   - - coding  utf-8 - - import os os system  export MY DATA  my export      But when I list export   MY DATA  not appear      export   How I can do an export with Python without saving  my export  into a file

User · Answer

I ve had to do something similar on a CI system recently   My options were to do it entirely in bash  yikes  or use a language like python which would have made programming the logic much simpler  My workaround was to do the programming in python and write the results to a file  Then use bash to export the results  For example    do calculations in python with open  quot   my export quot    quot w quot   as f      f write your results     then in bash export MY DATA  quot   cat   my export  quot  rm   my export    if no longer needed

User · Answer

Kind of a hack because it s not really python doing anything special here  but if you run the export command in the same sub-shell  you will probably get the result you want   import os  cmd    export MY DATA  1234   echo  MY DATA    or whatever command os system cmd

User · Answer

Another way to do this  if you re in a hurry and don t mind the hacky-aftertaste  is to execute the output of the python script in your bash environment and print out the commands to execute setting the environment in python  Not ideal but it can get the job done in a pinch  It s not very portable across shells  so YMMV     python -c  print  export MY DATA my export       you can also enclose the statement in backticks in some shells

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import os import shlex from subprocess import Popen  PIPE   os environ update key value   res   Popen shlex split  cmd xxx -xxx    stdin PIPE  stdout PIPE  stderr PIPE              env os environ  shell True  communicate  y ny ny n  encode  utf8    stdout   res 0  stderr   res 1

User · Answer

I have an excellent answer       bin bash  output   git diff origin master  origin develop     python -c       DO YOUR HACKING   variable1 to be exported  Yo Yo    variable2 to be exported  Honey Singh        so on   magic      magic   export onShell-var1     str variable1 to be exported      n    magic   export onShell-var2     str variable2 to be exported           print magic      eval   output  echo   onShell-var1     Output will be Yo Yo echo   onShell-var2     Output will be Honey Singh    Mr Alex Tingle is correct about those processes and sub-process stuffs  How it can be achieved is like the above I have mentioned  Key Concept is     Whatever printed from python will be stored in the variable in the catching variable in bash  output  We can execute any command in the form of string using eval So  prepare your print output from python in a meaningful bash commands use eval to execute it in bash   And you can see your results  NOTE Always execute the eval using double quotes or else bash will mess up your  ns and outputs will be strange  PS  I don t like bash but your have to use it

User · Answer

One line solution   eval  python -c  import sysconfig print  python include path  0   format sysconfig get path  include       echo  python include path    prints  home  lt usr gt  anaconda3 include python3 6m  in my case   Breakdown   Python call  python -c  import sysconfig print  python include path  0   format sysconfig get path  include        It s launching a python script that    imports sysconfig gets the python include path corresponding to this python binary  use  which python  to see which one is being used  prints the script  python include path  0   with  0  being the path from 2   Eval call  eval  python -c  import sysconfig print  python include path  0   format sysconfig get path  include         It s executing in the current bash instance the output from the python script  In my case  its executing   python include path  home  lt usr gt  anaconda3 include python3 6m   In other words  it s setting the environment variable  python include path  with that path for this shell instance   Inspired by  http   blog tintoy io 2017 06 exporting-environment-variables-from-python-to-bash

User · Answer

In the hope of providing clarity over common cinfusion     I have written many python  lt --  bash  lt --  elfbin toolchains and the proper way to see it is such as this   Each process  originator  has a state of the environment inherited from whatever invoked it  Any change remains lokal to that process  Transfering an environment state is a function by itself and runs in two directions  each with it s own caveats  The most common thing is to modify environment before running a sub-process  To go down to the metal  look at the exec   - call in C  There is a variant that takes a pointer to environment data  This is the only actually supported transfer of environment in typical OS es   Shell scripts will create a state to pass when running children when you do an export  Otherwise it just uses that which it got in the first place   In all other cases it will be some generic mechanism used to pass a set of data to allow the calling process itself to update it s environment based on the result of the child-processes output   Ex   ENVUPDATE     CMD THAT OUTPUTS KEYVAL LISTS  echo  ENVUPDATE  gt   TMPFILE source  TMPFILE   The same can of course be done using json  xml or other things as long as you have the tools to interpret and apply   The need for this may be  50  chance  a sign of misconstruing the basic primitives and that you need a better config or parameter interchange in your solution       Oh  in python I would do something like      need improvement depending on your situation   import re  RE KV re compile    a-z   w    s   s         OUTPUT RunSomething       Assuming  k1 v1 k2 v2    for kv in OUTPUT split        try      k v RE KV match kv  groups       os environ k  str v    except       The not a property case        pass

User · Answer

You actually want to do  import os os environ  MY DATA      my export

User · Answer

You could try os environ  MY DATA   instead

User · Answer

export is a command that you give directly to the shell  e g  bash   to tell it to add or modify one of its environment variables  You can t change your shell s environment from a child process  such as Python   it s just not possible  Here s what s happening when you try os system  export MY DATA  quot my export quot        bin bash process  command  python yourscript py  forks python subprocess         usr bin python process  command  os system    forks  bin sh subprocess               bin sh process  command  export      changes its local environment  When the bottom-most  bin sh subprocess finishes running your export     command  then it s discarded  along with the environment that you have just changed

User · Answer

Not that simple   python -c  import os  os putenv  MY DATA   1233      echo  MY DATA    lt - empty   But   python -c  import os  os putenv  MY DATA   123    os system  bash      echo  MY DATA   lt - 123

User · Answer

os system    home user1 exportPath ksh    exportPath ksh   export PATH MY DATA  my export

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