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author | Barry Warsaw <barry@python.org> | 2015-06-09 14:22:44 -0400 |
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committer | Barry Warsaw <barry@python.org> | 2015-06-09 14:22:44 -0400 |
commit | 9380acbbf707d570696ab953489e62173e515b24 (patch) | |
tree | ea276245e2c54fcbe83277919c8171c2d9bfea6d /Doc/library/string.rst | |
parent | 86a60bfb08cd87f570b1330bfbd244ff2cb781f6 (diff) | |
parent | 17d5f474238fc753bf4d28d458784a0e2e6d3cd9 (diff) | |
download | cpython-git-9380acbbf707d570696ab953489e62173e515b24.tar.gz |
- Issue #24351: Clarify what is meant by "identifier" in the context of
string.Template instances.
Diffstat (limited to 'Doc/library/string.rst')
-rw-r--r-- | Doc/library/string.rst | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/Doc/library/string.rst b/Doc/library/string.rst index eab9f370f6..2bd8dfdc96 100644 --- a/Doc/library/string.rst +++ b/Doc/library/string.rst @@ -644,12 +644,14 @@ Instead of the normal ``%``\ -based substitutions, Templates support ``$``\ * ``$$`` is an escape; it is replaced with a single ``$``. * ``$identifier`` names a substitution placeholder matching a mapping key of - ``"identifier"``. By default, ``"identifier"`` must spell a Python - identifier. The first non-identifier character after the ``$`` character - terminates this placeholder specification. - -* ``${identifier}`` is equivalent to ``$identifier``. It is required when valid - identifier characters follow the placeholder but are not part of the + ``"identifier"``. By default, ``"identifier"`` is restricted to any + case-insensitive ASCII alphanumeric string (including underscores) that + starts with an underscore or ASCII letter. The first non-identifier + character after the ``$`` character terminates this placeholder + specification. + +* ``${identifier}`` is equivalent to ``$identifier``. It is required when + valid identifier characters follow the placeholder but are not part of the placeholder, such as ``"${noun}ification"``. Any other appearance of ``$`` in the string will result in a :exc:`ValueError` |