Raymond Hettinger <[email protected]> added the comment:
This isn't a bug.
In Python 2, True and False are variable names rather than keywords. That
means they can be shadowed:
>>> False = 10
>>> True = 20
>>> [False, True]
[10, 20]
A Counter() is a kind a dictionary that returns zero rather than raising a
KeyError. When you give eval() a Counter as a locals() dict, you're
effectively shadowing the False and True variables:
>>> eval('[False, True]', {}, Counter())
[0, 0]
That follows from:
>>> c = Counter()
>>> c['True']
0
>>> c['False']
0
So effectively, your example translates to:
>>> [0, 0, 0].count(0)
3
----------
assignee: -> rhettinger
nosy: +rhettinger
resolution: -> not a bug
stage: -> resolved
status: open -> closed
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue37780>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
