René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Inject a flag variable into the global namespace to indicate to a script that it’s running inside bpython","articleBody":"It would be very advantageous if one could easily discern whether or not the execution environment is bpython. \r\n\r\nFor example, in IPython, the REPL environment sets a global variable `__IPYTHON__` to `True`. This allows for trivial tests like e.g.:\r\n\r\n```python\r\ntry:\r\n    __IPYTHON__\r\nexcept NameError:\r\n    in_ipython = False\r\nelse:\r\n    in_ipython = True\r\n```\r\n\r\nContrastingly, I just tried to programmatically figure out if my script was running in bpython or not, and the experience was… wanting. I tried the following three rubrics:\r\n\r\n1. `BPYTHON = type(sys.stdout).__module__.startswith('bpython')`\r\n2. `BPYTHON = 'bpython' in sys.argv[0]`\r\n3. `BPYTHON = '__console__' in sys.modules`\r\n\r\nThe first two methods work in the interactive REPL but don’t work in code loaded using the `-i` flag – presumably because it runs both before `sys.stdout` and friends have been wrapped, and before `sys.argv` has been mutated. The last method does seem to work, but it feels extremely janky and fragile and I don’t trust it to survive the next volley of bpython internals-refactoring.\r\n\r\nSo: can we get an officially-sanctioned method of determining that bpython is our host? That would be amazing, assuredly. It’s a great REPL, I use it every day – this’d make it even more betterer. Indeed!","author":{"url":"https://github.com/fish2000","@type":"Person","name":"fish2000"},"datePublished":"2020-02-04T13:21:50.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/795/bpython/issues/795"}