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pylint has issues with IntEnum.name type detection #1932

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jleclanche opened this issue Mar 14, 2018 · 2 comments · Fixed by #4558
Closed

pylint has issues with IntEnum.name type detection #1932

jleclanche opened this issue Mar 14, 2018 · 2 comments · Fixed by #4558
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@jleclanche
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# test.py
from enum import IntEnum


class MyEnum(IntEnum):
    FOO = 1

    def whats_my_name(self):
        return self.name.lower()


print(MyEnum.FOO.whats_my_name())

Steps to reproduce

  1. pylint -dC test.py with the file above

Output:

E:  8,15: Method 'name' has no 'lower' member (no-member)

pylint --version output

pylint 1.8.2,
astroid 1.6.1
Python 3.6.4 (default, Jan 5 2018, 02:35:40)
[GCC 7.2.1 20171224]
@PCManticore
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Thanks for the report @jleclanche It still amazes me how much weird stuff goes around in enum.

@geckon
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geckon commented May 4, 2018

Reproducible for a plain Enum as well: #2062

@jonapich jonapich mentioned this issue Nov 30, 2018
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nelfin added a commit to nelfin/astroid that referenced this issue Jun 10, 2021
@nelfin
Add fake "name" property to enum.Enum subclasses
1321913 
Ref pylint-dev/pylint#1932. Ref pylint-dev/pylint#2062. The enum.Enum class itself
defines two @DynamicClassAttribute data-descriptors "name" and "value"
which behave differently when looked up on an instance or on the class.
When dealing with inference of an arbitrary instance of the enum class,
e.g. in a method defined in the class body like:

    class SomeEnum(enum.Enum):
        def method(self):
            self.name  # <- here

we should assume that "self.name" is the string name of some enum
member, unless the enum itself defines a "name" member.
@nelfin nelfin mentioned this issue Jun 10, 2021
Merged
2 tasks
nelfin added a commit to nelfin/pylint that referenced this issue Jun 10, 2021
@nelfin
Add regression tests for Enum.name and .value inference
e50b5bb 
Ref pylint-dev#1932. Ref pylint-dev#2062. Ref pylint-dev/astroid#1020.
@nelfin nelfin mentioned this issue Jun 10, 2021
Merged
4 tasks
nelfin added a commit to nelfin/astroid that referenced this issue Jun 10, 2021
@nelfin
Add fake "name" property to enum.Enum subclasses
a575a03 
Ref pylint-dev/pylint#1932. Ref pylint-dev/pylint#2062. The enum.Enum class itself
defines two @DynamicClassAttribute data-descriptors "name" and "value"
which behave differently when looked up on an instance or on the class.
When dealing with inference of an arbitrary instance of the enum class,
e.g. in a method defined in the class body like:

    class SomeEnum(enum.Enum):
        def method(self):
            self.name  # <- here

we should assume that "self.name" is the string name of some enum
member, unless the enum itself defines a "name" member.
Pierre-Sassoulas added a commit to pylint-dev/astroid that referenced this issue Jun 13, 2021
@nelfin @Pierre-Sassoulas
Improve inference of Enum members called "name" and "value" (#1020)
4c9b9b5 
* Add DynamicClassAttribute to list of properties

DynamicClassAttribute is a descriptor defined in Python's Lib/types.py
which changes the behaviour of an attribute depending on if it is looked
up on the class or on an instance.

* Add fake "name" property to enum.Enum subclasses

Ref pylint-dev/pylint#1932. Ref pylint-dev/pylint#2062. The enum.Enum class itself
defines two @DynamicClassAttribute data-descriptors "name" and "value"
which behave differently when looked up on an instance or on the class.
When dealing with inference of an arbitrary instance of the enum class,
e.g. in a method defined in the class body like:

    class SomeEnum(enum.Enum):
        def method(self):
            self.name  # <- here

we should assume that "self.name" is the string name of some enum
member, unless the enum itself defines a "name" member.

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>
nelfin added a commit to nelfin/pylint that referenced this issue Jun 13, 2021
@nelfin
Add regression tests for Enum.name and .value inference
439ff7b 
Ref pylint-dev#1932. Ref pylint-dev#2062. Ref pylint-dev/astroid#1020.
cdce8p pushed a commit that referenced this issue Jun 16, 2021
@nelfin
Add regression tests for Enum.name and .value inference (#4558)
f3ea315 
Ref #1932. Ref #2062. Ref pylint-dev/astroid#1020.
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Add regression tests for Enum.name and .value inference nelfin/pylint
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@geckon @jleclanche @PCManticore