thautwarm <twsh...@outlook.com> added the comment:
I can confirm Guido's words, now parentheses for continuation across lines are already supported. Even without parentheses, multiline with items can be supported. I just implemented it here: https://github.com/thautwarm/cpython/blob/bpo-12782/Grammar/python.gram#L180-L187 from contextlib import contextmanager @contextmanager def f(x): try: yield x finally: pass # Ok with f('c') as a, f('a') as b: pass # Ok with f('c') as a, f('a') as b, f('a') as c: pass # ERROR with f('c') as a, f('a') as b, f('a') as c: x = 1 + 1 # message: File "/home/thaut/github/cpython/../a.py", line 49 x = 1 + 1 ^ IndentationError: unindent does not match any outer indentation level # ERROR with f('c') as a, f('a') as b, f('a') as c: x = 1 + 1 File "/home/thaut/github/cpython/../a.py", line 49 x = 1 + 1 IndentationError: unexpected indent The grammar is: with_stmt[stmt_ty]: | ... | 'with' a=(',' [NEWLINE ~ INDENT?]).with_item+ ':' tc=[TYPE_COMMENT] NEWLINE b=statements DEDENT { _Py_With(a, b, NEW_TYPE_COMMENT(p, tc), EXTRA) } | ... The restriction here is, since the second 'with_item', until the end of 'statements', the expression and statements have to keep the same indentation. with item1, item2, ...: block The indentation of 'item2', ..., 'block' should be the same. This implementation leverages the new PEG and how the lexer deals with indent/dedent. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue12782> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
