[New-bugs-announce] [issue32263] Template string docs refer to "normal %-based substitutions"

Glenn Linderman report at bugs.python.org
Sat Dec 9 16:36:38 EST 2017

New submission from Glenn Linderman <v+python at g.nevcal.com>:

At least as far back as Python 3.1, the description for Template strings (section 6.1.5 in version 3.6.4rc1 docs) starts by differentiating what Template strings do, as:

Instead of the normal %-based substitutions, Templates support $-based substitutions, using the following rules:

Since this immediately follows a section describing the "Custom String Formatting" and the "Format Specification Mini-Language", which does a type of substitutions that is {} based, rather than % based, it is hard to grasp exactly why %-based substitutions would be considered "normal". Of course, I know why, due to the % operator, but for someone just reading through chapter 6, it is a reference that raises the mental question "Huh? What is normal %-based substitution? Are Templates abnormal, if %-based substitutions are normal? What did I miss? The previous section was about {}-based substitutions? Are they abnormal, too? What are normal %-based substitutions, anyway?" rather than helping to describe what Templates are and do.

assignee: docs at python
components: Documentation
messages: 307922
nosy: docs at python, v+python
priority: normal
severity: normal
status: open
title: Template string docs refer to "normal %-based substitutions"
versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7, Python 3.8

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