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| author | yum <yum.food.vr@gmail.com> | 2023-01-01 21:05:27 -0800 |
|---|---|---|
| committer | yum <yum.food.vr@gmail.com> | 2023-01-01 21:44:45 -0800 |
| commit | e25bdba3a3a53b09be5269d8b065c13b73ab55c3 (patch) | |
| tree | 1d1dc1d94cde92c2f4f8ce86017395054787515d /FOSS/Python/Dependencies/future-0.18.2/docs/func_annotations.rst | |
| parent | 0d408cc812a094a708edbe4baf536e928731cfc3 (diff) | |
Embed git in package
package.ps1 fetches PortableGit and embeds it in the package. This
eliminates all but one runtime dependency (MSVC++ Redistributable).
* Move Python into a new FOSS folder.
Diffstat (limited to 'FOSS/Python/Dependencies/future-0.18.2/docs/func_annotations.rst')
| -rw-r--r-- | FOSS/Python/Dependencies/future-0.18.2/docs/func_annotations.rst | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/FOSS/Python/Dependencies/future-0.18.2/docs/func_annotations.rst b/FOSS/Python/Dependencies/future-0.18.2/docs/func_annotations.rst new file mode 100644 index 0000000..a298f2c --- /dev/null +++ b/FOSS/Python/Dependencies/future-0.18.2/docs/func_annotations.rst @@ -0,0 +1,37 @@ +.. _func_annotations: + +Function annotations +==================== + +Function annotations are a piece of syntax introduced in Python 3.0 that was +not backported to Python 2.x. (See PEP 3107: +http://www.python.org/dev/peps/pep-3107/). They cause Python 2 to raise a +SyntaxError. + +To rewrite Python 3 code with function annotations to be compatible with both +Python 3 and Python 2, you can replace the annotation syntax with a dictionary +called ``__annotations__`` as an attribute on your functions. For example, code +such as this:: + + def _parse(self, filename: str, dir='.') -> list: + pass + +can be re-expressed like this:: + + def _parse(self, filename, dir='.'): + pass + _parse.__annotations__ = {'filename': str, 'return': list} + +As described in PEP 3107, the annotation for a function's return value +corresponds to the ``'return'`` key in the dictionary. + +(Note that PEP 3107 describes annotations as belonging to a +``func_annotations`` attribute. This attribute was renamed in Python 3.2 to +``__annotations__``.) + +Be aware that some libraries that consume function annotations, such as +`Reticulated <https://github.com/mvitousek/reticulated>`_, have their own +semantics for supporting earlier Python versions, such as decorators. If you +are using such a library, please use its own mechanism for providing +compatibility with earlier Python versions, rather than the generic equivalent +above. |
