diff options
| author |  laurentlb <laurentlb@google.com> | 2018-02-12 08:01:26 -0800 |
|---|---|---|
| committer |  Copybara-Service <copybara-piper@google.com> | 2018-02-12 08:02:49 -0800 |
| commit | 33ca88f7a757d9c5c103e539fd097abdd613b037 (patch) | |
| tree | 2f83db22e66f87ab475ac190fe3cb052dc99afb2 /site | |
| parent | 8f8e5169c2fd35625c05dbfca9edd03e99d40036 (diff) | |
Document a few more differences between Skylark and Python.
RELNOTES: None.
PiperOrigin-RevId: 185378771
Diffstat (limited to 'site')
| -rw-r--r-- | site/docs/skylark/language.md | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/site/docs/skylark/language.md b/site/docs/skylark/language.md index c1c0d874ef..d374f323b4 100644 --- a/site/docs/skylark/language.md +++ b/site/docs/skylark/language.md @@ -114,7 +114,8 @@ Python: * Recursion is not allowed. -* Int type is limited to 32-bit signed integers. +* Int type is limited to 32-bit signed integers (an overflow will throw an + error). * Lists and other mutable types may be stored in dictionary keys once they are frozen. @@ -129,21 +130,25 @@ Python: declaration. However, it is fine to define `f()` before `g()`, even if `f()` calls `g()`. -* The order comparison operators (<, <=, >=, >) are not defined across different - types of values, e.g., you can't compare `5 < 'foo'` (however you still can - compare them using == or !=). This is a difference with Python 2, but - consistent with Python 3. Note that this means you are unable to sort lists - that contain mixed types of values. +* The comparison operators (`<`, `<=`, `>=`, `>`) are not defined across + different types of values, e.g., you can't compare `5 < 'foo'` (however you + still can compare them using `==` or `!=`). This is a difference with Python + 2, but consistent with Python 3. Note that this means you are unable to sort + lists that contain mixed types of values. * Tuple syntax is more restrictive. You may use a trailing comma only when the tuple is between parentheses, e.g. write `(1,)` instead of `1,`. +* Dictionary literals cannot have duplicated keys. For example, this is an + error: `{"a": 4, "b": 7, "a": 1}`. + * Strings are represented with double-quotes (e.g. when you call [repr](lib/globals.html#repr)). The following Python features are not supported: * implicit string concatenation (use explicit `+` operator) +* Chained comparisons (e.g. `1 < x < 5`) * `class` (see [`struct`](lib/globals.html#struct) function) * `import` (see [`load`](concepts.md#loading-an-extension) statement) * `while`, `yield` |