I'm looking for a way to call a python script from a batch file and getting a return code from the python script. Confusing I know, but it's based on a system that's currently in use. I'd re-write it, but this way would be much, much quicker.
So:
Bat ---------------------> Python
* call python file *
Bat <--------------------------------- Python
* python does a load of work *
* and returns a return code *
The windows shell saves the return code in the ERRORLEVEL variable:
python somescript.py
echo %ERRORLEVEL%
In the python script you can exit the script and set the return value by calling exit():
exit(15)
In older versions of python you might first have to import the exit() function from the sys module:
from sys import exit
exit(15)
sys.exit(). for instance when writing a script to be run on a Visual Studio build process, and you want to display script output on the Build Output window. the os._exit() command does not allow you to see python's 'stdout'. Bottom line: sys.exit() can be more robust than os._exit() in some cases. whenever one doesn't behave as expected consider user the other method.You can try this batch script for this:
@echo off
REM %1 - This is the parameter we pass with the desired return code for the Python script that will be captured by the ErrorLevel env. variable.
REM A value of 0 is the default exit code, meaning it has all gone well. A value greater than 0 implies an error
REM and this value can be captured and used for any error control logic and handling within the script
set ERRORLEVEL=
set RETURN_CODE=%1
echo (Before Python script run) ERRORLEVEL VALUE IS: [ %ERRORLEVEL% ]
echo.
call python -c "import sys; exit_code = %RETURN_CODE%; print('(Inside python script now) Setting up exit code to ' + str(exit_code)); sys.exit(exit_code)"
echo.
echo (After Python script run) ERRORLEVEL VALUE IS: [ %ERRORLEVEL% ]
echo.
And when you run it a couple of times with different return code values you can see the expected behaviour:
PS C:\Scripts\ScriptTests> & '\TestPythonReturnCodes.cmd' 5
(Before Python script run) ERRORLEVEL VALUE IS: [ 0 ]
(Inside python script now) Setting up exit code to 5
(After Python script run) ERRORLEVEL VALUE IS: [ 5 ]
PS C:\Scripts\ScriptTests> & '\TestPythonReturnCodes.cmd' 3
(Before Python script run) ERRORLEVEL VALUE IS: [ 0 ]
(Inside python script now) Setting up exit code to 3
(After Python script run) ERRORLEVEL VALUE IS: [ 3 ]
PS C:\Scripts\ScriptTests
