https://bugs.kde.org/show_bug.cgi?id=359915
Bug ID: 359915
Summary: Tuple unpacking in a list comprehension not supported
Product: kdev-python
Version: frameworks
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Language support
Assignee: m...@svenbrauch.de
Reporter: nicolas.alva...@gmail.com
When a list comprehension has multiple identifiers in the 'for' clause, it's
supposed to do sequence unpacking. This has several problems in kdev-python.
In the simplest case, variables are identified but not given the correct types:
data = [('a',1), ('b',2)] # data is 'list of tuple of (str,int)'
strs = [a for a,b in data] # 'a' is mixed, 'b' is mixed, 'strs' is 'list of
mixed'
It should be able to recognize that 'a' is str and 'b' is int.
If there are nested tuples, the inner ones aren't even recognized as variable
declarations (related: bug 314024):
data2 = [(1, ('x', 3.0)), (2, ('y', 4.5))] # list of tuple of ( int, tuple
of ( str, float ) )
[a for (a,(b,c)) in data2] # 'a' is mixed, 'b' and 'c' are underlined as
undefined variables
And here is an almost-realistic ultimate sample that would go great in the test
suite :)
users = {'a':19, 'b':42, 'c':35}
sorted_list = sorted(users.items(), key=lambda kv: (-kv[1], kv[0]))
result = [(r,k,v) for r,(k,v) in enumerate(sorted_list, 1)] # 'result'
should be a tuple of (int, str, int)
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