Karthikeyan Singaravelan <[email protected]> added the comment:
The fixers are supposed to be executed on Python 2 files where apply was a
builtin and was shadowed. So from the context of the fixer it tries to make the
modification and it cannot distinguish that it's a builtin or user-defined
call. In Python 3 the apply function can be defined by the user and 2to3 fixer
doesn't make sense to be executed on Python 3 files. filter is another example
where the call is transformed into a list comprehension by 2to3 but by the
issue it shouldn't be done because filter is a user-defined function though
it's a builtin in Python 2.
def filter(func, iterable):
pass
filter(lambda x: x % 2 == 0, range(10))
RefactoringTool: Refactored /tmp/foo.py
--- /tmp/foo.py (original)
+++ /tmp/foo.py (refactored)
@@ -1,4 +1,4 @@
def filter(func, iterable):
pass
-filter(lambda x: x % 2 == 0, range(10))
+[x for x in range(10) if x % 2 == 0]
----------
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<https://bugs.python.org/issue39670>
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