diff options
| -rw-r--r-- | site/versions/master/docs/skylark/concepts.md | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/site/versions/master/docs/skylark/concepts.md b/site/versions/master/docs/skylark/concepts.md index dc749c458d..ecf49b89da 100644 --- a/site/versions/master/docs/skylark/concepts.md +++ b/site/versions/master/docs/skylark/concepts.md @@ -162,7 +162,7 @@ Python: * Sets have reference equality semantics and can be stored in other sets. -* Lists and other mutable values may be stored in sets and in dictionary +* Lists and other mutable types may be stored in sets and in dictionary keys once they are frozen. * Modifying a collection during iteration is an error. You can avoid the error @@ -187,9 +187,6 @@ The following items are upcoming changes. deterministic. As an implementation matter, some kinds of dictionaries may continue to use sorted order while others may use insertion order. -* Some collections currently use reference equality (sometimes inconsistently). - This will change to structural equality for all collections except sets. - * The `+=` operator and similar operators are currently syntactic sugar; `x += y` is the same as `x = x + y`. This will change to follow Python semantics, so that for mutable collection datatypes, `x += y` will be a @@ -203,6 +200,14 @@ The following items are upcoming changes. `dict(a.items() + b.items())`. Likewise, there is a `+` operator for sets that will be going away; users should use `|` instead. +* The order comparison operators (<, <=, >=, >) are currently defined across + different types of values, e.g., you can write `5 < 'foo'`. This will be an + error, just like in Python 3. Note that this means you will be unable to + sort lists that contain mixed types of values. + +* The set datatype will be renamed in order to avoid confusion with Python's + set datatype, which behaves very differently. + The following Python features are not supported: * `class` (see [`struct`](lib/globals.html#struct) function) |