On 2017-11-02 21:30, Ken Kundert wrote:
I just encountered this:
'{:0s}'.format('hello')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: '=' alignment not allowed in string format specifier
The exception goes away if I do not specify a width of the string:
'{:s}'.format('hello')
'hello'
My reading of the documentation says I should be able to specify a width
when interpolating a string.
I have tried this in 2.7.13, 3.6.1 and 3.6.2 and it fails in all of them.
Is this a bug or am I confused?
-Ken
The docs say this:
"""
When no explicit alignment is given, preceding the width field by a zero
('0') character enables sign-aware zero-padding for numeric types. This
is equivalent to a fill character of '0' with an alignment type of '='.
"""
It thinks that the "0" means zero-padding, etc, as explained above.
(Having an explicit width of 0 is kind of odd anyway, if you think about
it!)
The solution is to include an alignment character:
>>> '{:<0s}'.format('hello')
'hello'
--
https://mail.python.org/mailman/listinfo/python-list
