[Python-checkins] cpython (merge 3.6 -> default): merge
raymond.hettinger
python-checkins at python.org
Sat Jan 28 23:17:14 EST 2017
https://hg.python.org/cpython/rev/9e9f292c65ec
changeset: 106328:9e9f292c65ec
parent: 106326:d7ec72c1620c
parent: 106327:b33c3f26eefa
user: Raymond Hettinger <python at rcn.com>
date: Sat Jan 28 20:17:07 2017 -0800
summary:
merge
files:
Doc/library/typing.rst | 22 ++++++++++++++++++----
1 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst
--- a/Doc/library/typing.rst
+++ b/Doc/library/typing.rst
@@ -735,10 +735,21 @@
Employee = collections.namedtuple('Employee', ['name', 'id'])
- The resulting class has one extra attribute: ``_field_types``,
- giving a dict mapping field names to types. (The field names
- are in the ``_fields`` attribute, which is part of the namedtuple
- API.)
+ To give a field a default value, you can assign to it in the class body::
+
+ class Employee(NamedTuple):
+ name: str
+ id: int = 3
+
+ employee = Employee('Guido')
+ assert employee.id == 3
+
+ Fields with a default value must come after any fields without a default.
+
+ The resulting class has two extra attributes: ``_field_types``,
+ giving a dict mapping field names to types, and ``field_defaults``, a dict
+ mapping field names to default values. (The field names are in the
+ ``_fields`` attribute, which is part of the namedtuple API.)
Backward-compatible usage::
@@ -747,6 +758,9 @@
.. versionchanged:: 3.6
Added support for :pep:`526` variable annotation syntax.
+ .. versionchanged:: 3.6.1
+ Added support for default values.
+
.. function:: NewType(typ)
A helper function to indicate a distinct types to a typechecker,
--
Repository URL: https://hg.python.org/cpython
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