Sascha Desch <sascha.de...@hotmail.com> added the comment:
That definition of `.parse()` definitely makes sense. Do you then think this is
out of scope for `Formatter` in general or just for `.parse()`?. Just for
reference, this is what I currently use to get automatic numbering to work for
my use case.
```
def parse_command_template(format_string):
auto_numbering_error = ValueError(
'cannot switch from automatic field numbering to manual field
specification')
index = 0
auto_numbering = None
for literal_text, field_name, spec, conversion in
Formatter().parse(format_string):
if field_name is not None:
if field_name.isdigit():
if auto_numbering is True:
raise auto_numbering_error
auto_numbering = False
if field_name == '':
if auto_numbering is False:
raise auto_numbering_error
auto_numbering = True
field_name = str(index)
index += 1
yield literal_text, field_name, spec, conversion
```
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45704>
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