Terry J. Reedy added the comment:
As I read the docs, the error message is correct and this issue is invalid as a
behavior issue. I read the OP's second message as more or less saying this also.
"'=' Forces the padding to be placed after the sign (if any) but before the
digits. This is used for printing fields in the form ‘+000000120’. This
alignment option is only valid for numeric types."
"If the width field is preceded by a zero ('0') character, this enables
zero-padding. This is equivalent to an alignment type of '=' and a fill
character of '0'."
So ":02" is equivalent to ":0=2", which is invalid.
>>> '{:02d}'.format(1)
'01'
works fine.
I decided make this a doc issue and add " for numeric types" after "this
enables zero-padding" before closing this.
----------
assignee: -> docs@python
components: +Documentation -Interpreter Core
nosy: +docs@python, terry.reedy
versions: +Python 2.7, Python 3.3
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