diff options
Diffstat (limited to 'Doc/library')
| -rw-r--r-- | Doc/library/collections.rst | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst index 32cc639..9ff8a27 100644 --- a/Doc/library/collections.rst +++ b/Doc/library/collections.rst @@ -597,7 +597,7 @@ Named tuples assign meaning to each position in a tuple and allow for more reada self-documenting code. They can be used wherever regular tuples are used, and they add the ability to access fields by name instead of position index. -.. function:: namedtuple(typename, field_names, [verbose]) +.. function:: namedtuple(typename, field_names, [verbose], [rename]) Returns a new tuple subclass named *typename*. The new subclass is used to create tuple-like objects that have fields accessible by attribute lookup as @@ -615,11 +615,19 @@ they add the ability to access fields by name instead of position index. a :mod:`keyword` such as *class*, *for*, *return*, *global*, *pass*, or *raise*. + If *rename* is true, invalid fieldnames are automatically replaced + with positional names. For example, ``['abc', 'def', 'ghi', 'abc']`` is + converted to ``['abc', '_2', 'ghi', '_4']``, eliminating the keyword + ``def`` and the duplicate fieldname ``abc``. + If *verbose* is true, the class definition is printed just before being built. Named tuple instances do not have per-instance dictionaries, so they are lightweight and require no more memory than regular tuples. + .. versionchanged:: 2.7 + added support for *rename*. + Example: .. doctest:: |