New submission from Jeremy <ucod...@gmail.com>:
At some point in 3.9 Python appears to have stopped accepting source that
starts with an indent, then a '\', then the indented statement. From the
lexical analysis [1] "Indentation cannot be split over multiple physical lines
using backslashes; the whitespace up to the first backslash determines the
indentation."
Running the attached program under 3.8.12 I get:
```
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377
```
But running under 3.10.0 I get:
```
File "/Users/jeremyp/tmp/nodent.py", line 3
"""Print a Fibonacci series up to n."""
^
IndentationError: expected an indented block after function definition on line 1
```
Running under 3.9.9 also gives an IndentationError, both with and without -X
oldparser. So this doesn't seem directly related to the new parser, but seems
likely it is fall out from the general grammar restructuring.
IMHO it isn't a particularly nice feature for the language to have. Especially
since not all lines like ' \' behave the same. But it was there and
documented for many years, so should probably be put back. Does a core
developer agree? That the implementation is not following the spec?
[1]: https://docs.python.org/3/reference/lexical_analysis.html#indentation
----------
components: Parser
files: nodent.py
messages: 408651
nosy: lys.nikolaou, pablogsal, ucodery
priority: normal
severity: normal
status: open
title: IndendationError from multi-line indented statements
versions: Python 3.10, Python 3.11, Python 3.9
Added file: https://bugs.python.org/file50496/nodent.py
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<https://bugs.python.org/issue46091>
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