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False errors with named format string placeholders: "% ... has unsupported format character '(' " ... #562
Description
pyflakes v2.2.0 (on PY3.7) barks incorrectly on complex expressions in named placeholders of classic format strings - which are valid Python3 & Python2.
The bug was not in pyflakes v2.1.1 (on PY2.7 at least).
This test code produces the false errors shown below:
def f():
da = datetime.date.today()
six.print_("test %(da.strftime('%a %Y-%m-%d'))s" % EvalDict())
False errors:
x.py:9:16 '...' % ... has unsupported format character '('
x.py:9:16 '...' % ... has unsupported format character 'Y'
x.py:9:16 '...' % ... has unsupported format character 'm'
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