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List:       kdevelop-bugs
Subject:    [Bug 292221] New: Incorrect type collection from and within set comprehension
From:       Eike Hein <hein () kde ! org>
Date:       2012-01-22 20:14:52
Message-ID: bug-292221-40295 () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=292221

           Summary: Incorrect type collection from and within set
                    comprehension
           Product: kdev-python
           Version: git master
          Platform: Compiled Sources
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdevelop-bugs@kdevelop.org
        ReportedBy: hein@kde.org
                CC: svenbrauch@googlemail.com


Given:

foo = {line.strip() for line in file.readlines()}


... kdev-python considers line to be mixed, even though it considers
readlines() to return string. Further, it considers foo to be string, when it
should be set of string. There is also no tooltip for strip() accordingly.

Given:

foo = {line.strip() for line in file.readlines() if line.strip()}

... things become wonkier. Now foo is considered a set of unknown for some
reason.

Of course, things go a bit deeper: readlines() doesn't actually return string 
but list of string. (Or, in Python 3, it might return list of bytes if a file
is opened in binary mode.)

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