[issue29568] undefined parsing behavior with the old style string formatting

[Jerry Dimitrov]

Jerry Dimitrov added the comment:

Thanks for the documentation reference. Can we at least add this link reference 
[1] as a note or something like that into those documentation sections: [2] 
https://docs.python.org/2/library/stdtypes.html#string-formatting and  [3] 
https://docs.python.org/3/library/string.html#string-formatting

I couldn't fine the printf specific documentation at first, so this is why I 
created the report.

Regards,
Jerry

--

___
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29568>
___
___
Python-bugs-list mailing list
Unsubscribe: 
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com

[issue29568] undefined parsing behavior with the old style string formatting

[Jerry Dimitrov]

New submission from Jerry Dimitrov:

Hello everyone,
This is my first bug report to the python project, so please excuse me if the 
metadata for this particular issue is not 100% accurate.

Today I noticed (with the help from couple of people in IRC) a strange behavior 
in the python string formatting functionality.

Consider the following code snippets:

```
'%(a)s %(b)' % {'a': '1', 'b': '2'}

# result:
Traceback (most recent call last):
  File "", line 1, in 
ValueError: incomplete format
```


```
'%(a) %(b)s' % {'a': '1', 'b': '2'}

# result:
'%(b)s'

# expected result:
Traceback (most recent call last):
  File "", line 1, in 
ValueError: incomplete format
```

It seems that there is some kind of inconsistent (undefined) behavior, during 
the parsing of the type character for the formatted string (tested across all 
major python 2.x/3.x versions).

According to the documentation for string formatting and the relevant PEPs, 
there is no additional info about this particular case.

I want to say thank you to Yhg1s, JustASlacker, Jerub and lz1irq for 
discovering this 'bug/feature' and the additional information about it.

Please let me know if this is a bug, since I am not 100% sure if this is the 
case.
Thanks in advance for your time!

Best Regards,
Jerry

--
components: Interpreter Core
messages: 287857
nosy: Jerry Dimitrov
priority: normal
severity: normal
status: open
title: undefined parsing behavior with the old style string formatting
type: behavior
versions: Python 2.7, Python 3.3, Python 3.4, Python 3.5, Python 3.6, Python 3.7

___
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29568>
___
___
Python-bugs-list mailing list
Unsubscribe: 
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com