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Aug 25, 2019
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Python: Update change note for 1.22. #1817

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Python: Update change note for 1.22.
taus-semmle Aug 24, 2019
f08d857
Address review comments and add missing notes.
taus-semmle Aug 25, 2019
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22 changes: 21 additions & 1 deletion change-notes/1.22/analysis-python.md
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### Points-to
Tracking of "unknown" values from modules that are absent from the database has been improved. Particularly when an "unknown" value is used as a decorator, the decorated function is tracked.

### Loop unrolling
The extractor now unrolls a single iteration of loops that are known to run at least once. This improves analysis in cases like the following

### Impact on existing queries.
```python
if seq:
for x in seq:
y = x
y # y is defined here
```

### Better API for function parameter annotations
Instances of the `Parameter` and `ParameterDefinition` class now have a `getAnnotation` method that returns the corresponding parameter annotation, if one exists.

### Improvements to the Value API
- The Value API has been extended with classes representing functions, classes, tuples, and other types.

- `Value::forInt(int x)` and `Value::forString(string s)` have been added to make it easier to refer to the `Value` entities for common constants.

### Other improvements

- Short flags for regexes (for example, `re.M` for multiline regexes) are now handled correctly.
- Modules with multiple import roots no longer get multiple names.
- A new `NegativeIntegerLiteral` class has been added as a subtype of `ImmutableLiteral`, so that `-1` is treated as an `ImmutableLiteral`. This means that queries looking for the use of constant integers will automatically handle negative numbers.

## New queries

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