What techniques are available to return values from %@python to TCC ? I have been exploring some straightforward ways, but I can't see how to get something out of @python except for console output. Note that I am not using the supported ActivePython but another distribution, so my issue could be all there. Anyways, this is what I tried: Capture standard output: set x=%@python[print 1+1] >out This sets x=0 (python's exit code?), creates an empty out file and prints 2 to the console. Set a TCC variable from python: how can I do that? Incidentally I discovered that the persistent python interpreter gets its own frozen environment block, so setting environment variables, like $PATH, from python is pointless because changes aren't reflected in TCC's environment block. Write to a file from python. Here is a working example, but I would like to find a memory based solution as well, like #2. Code: set tmpf=%@unique["%[TEMP]"] echo>nul %@python[with open(r'%[tmpf]','w') as tmpf: print >>tmpf, 1+1] type "%[tmpf]" del "%[tmpf]"