Message386145
When creating a namedtuple such as this one:
from collections import namedtuple
class C(namedtuple('C', ('hello', 'world'))):
pass
print(C.__new__.__globals__)
The globals' dict of __new__ contains a "__builtins__" key which is set to None in collections/__init__.py:
namespace = {
'_tuple_new': tuple_new,
'__builtins__': None,
'__name__': f'namedtuple_{typename}',
}
When such globals are used with eval(), it will raise a TypeError such as:
>>> eval('X', {'__builtins__': None})
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1, in <module>
TypeError: 'NoneType' object is not subscriptable
If an empty dict was used instead, we get the expected exception:
>>> eval('X', {'__builtins__': {}})
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1, in <module>
NameError: name 'X' is not defined
Given that both ways allow preventing references to any builtin, please consider switching to an empty dict. Also, even though this is documented as implementation detail, this would agree more with the current documentation stating:
The value of __builtins__ is normally either this module or the value of this module’s __dict__ attribute
https://docs.python.org/3/library/builtins.html |
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Date |
User |
Action |
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2021-02-02 14:46:44 | douglas-raillard-arm | set | recipients:
+ douglas-raillard-arm |
2021-02-02 14:46:44 | douglas-raillard-arm | set | messageid: <1612277204.9.0.79430264778.issue43102@roundup.psfhosted.org> |
2021-02-02 14:46:44 | douglas-raillard-arm | link | issue43102 messages |
2021-02-02 14:46:44 | douglas-raillard-arm | create | |
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