Various errors have an unnecessary "__env__." appended to the front of something that confuses people, because it has nothing to do with their programs

I've seen this env whatever pop up all over the place, but [here](https://www.khanacademy.org/computer-programming/just-because/3134012686?qa_expand_key=kaencrypted_3ea97efa16f621a032122177ff2da2c3_4e9e613f3dbb1e7c76b1940cc0af3773bd025305a809e0dda211c04170553eea9f2de41aecbf34ba234011215f4593eee0da2ba80b7eb530cd33e7997db019703529efaaa8b5d93eec126046f8dda1a7c3fc57c4c7944d3e414904c6faf9267de764353ed91d3d919ea23637ed5a6538c7afcb7444bc9049afb05065520fdfecbced5e62d4b5856eb4f7a1cb8a0e81e8f17e85f796812392ede14395c2c8dcf3) is the program that produced that error. Note that you have to edit the code to make the error pop up, which perhaps should be a separate issue. Why does editing code cause errors sometimes? (I mean if you type in some random syntactical error that will obviously cause an error, but on this program you can initiate the error by simply typing a comment, and it doesn't go away until you restart.)