I need to set some environment variables in the Python script and I want all the other scripts that are called from Python to see the environment variables\' set.
If
You should assign string value to environment variable.
os.environ["DEBUSSY"] = "1"
If you want to read or print the environment variable just use
print os.environ["DEBUSSY"]
This changes will be effective only for the current process where it was assigned, it will no change the value permanently. The child processes will automatically inherit the environment of the parent process.