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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 eab9f37..2bd8dfd 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` |