Ned Deily <n...@python.org> added the comment:
For the record, Serhiy commented on this issue today in a thread on the
python-committers list:
"I have doubts about two issues. I feel the responsibility for them because I
had the opportunity to solve them before, but I lost it.
1. Changes in the AST. Few third-party projects was broken by it and already
are fixed. I suppose yet few projects will be changed after 3.7 be released. It
is interesting that IPython was broken in different way than other projects. It
was needed to reintroduce the docstring in the list of statements, effectively
reverting the 3.7 change. IPython allows to enter several statements at prompt,
and therefore it compiles them with the 'exec' mode instead of 'single' as the
CPython REPL and IDLE shell. Currently CPython doesn't allow you to paste
arbitrary script like the following:
if a:
b
if c:
d
You need to add an empty line between top-level complex statements. If one time
CPython will add support of pasting several statements without empty lines
between, it might need to add the same hack as IPython. I afraid that we might
be needed to change AST again, in 3.7.1 or in 3.8.0."
And later:
"Inada's patch looked complex (actually it mostly restored the code before his
previous change). We didn't know about IPython and we decided that it is not
worth to change this code at this stage (after beta2). And definitely it will
be later to do this after rc1."
Full context/content starting here:
https://mail.python.org/pipermail/python-committers/2018-May/005467.html
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<https://bugs.python.org/issue32911>
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