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A comment on PyPy.js: A fast, compliant Python implementation for the web. Parent comment

Re:PyPy.js: A fast, compliant Python implementation for the web by bzbarsky on Wednesday May 06, 2015 @02:16PM (#9500674)
The introspection bit is because js.globals is implemented with a fancy __getattr__ but doesn't have a __dir__. In general, dir() is not reliable in the face of custom __getattr__ implementations unless the implementor goes out of the way to make it work.
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Re:PyPy.js: A fast, compliant Python implementation for the web by e12e on Thursday May 07, 2015 @01:58AM (#9503500)
Oh, right. I didn't consider that:

  Welcome to PyPy.js!
  >>> import js
  >>> "console" in js.globals
  True
  >>> "console" in dir(js.globals)
  False
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