The following list comprehension and generator expression are almost, but not quite, the same:
[expr for x in iterable] list(expr for x in iterable) The difference is in the handling of StopIteration raised inside the expr. Generator expressions consume them and halt, while comprehensions allow them to leak out. A simple example: iterable = [iter([])] list(next(x) for x in iterable) => returns [] But: [next(x) for x in iterable] => raises StopIteration Has anyone come across this difference in the wild? Was it a problem? Do you rely on that difference, or is it a nuisance? Has it caused difficulty in debugging code? If you had to keep one behaviour, which would you keep? -- Steven -- https://mail.python.org/mailman/listinfo/python-list
