避免 Pylint 警告 E1101: 对于具有动态属性的类，“实例的. . has no. . member”

小开

Just to provide the answer that works for me now - as The Compiler suggested you can add a rule for the problematic class in your projects .pylintrc:

[TYPECHECK]
ignored-classes=Fysom,MyClass

小开

最佳答案

This page describes the error and gives an easy way to address it directly in the code. tl;dr

Used when an object (variable, function, …) is accessed for a non-existent member.

False positives: This message may report object members that are created dynamically, but exist at the time they are accessed.

A commentor mentions that it can be disabled on a single line at the top of the file with # pylint: disable=no-member. I also found that you can use # pylint: disable=E1101 based on this reddit entry.

小开

Try this! My problem solved!

Pylint doesn't understand the Django's dynamic filed. Thus, we need to teach what the Django is to Pylint

*for vscode in Windows 10 *

$ pip install pylint-django
$ cd your_project_folder
$ code . // run vscode

Install extension for Python, Django Snippets, Django Template in vscode

Open .vscode/settings.json in vscode and add:

{
"python.linting.pylintEnabled": true,
"python.linting.enabled": true,
"python.pythonPath": "venv\\Scripts\\python.exe",
"python.linting.pylintArgs": [
"--load-plugins",
"pylint_django"
],
}

小开

PyLint gives this type of errors on two cases Link:

Used when an object (variable, function, …) is accessed for a non-existent member.
False positives: This message may report object members that are created dynamically, but exist at the time they are accessed.

As this error is identified as E1101 error. You can solve the issue by adding the following line in your code.

# pylint: disable=E1101

小开

For me just installing pylint-django solved the issue:

pip install pylint-django

小开

I was able to avoid this warning by adding the __getattr__ method to my class, which python calls when an attribute is not found on an object. Although definitely not the cleanest solution, it worked for my particular use-case as pylint considers the object valid.

import warnings
class AppConfiguration(object):
...
def __getattr__(self, name):
''' will only get called for undefined attributes '''
warnings.warn('No member "%s" contained in settings config.' % name)
return ''

More information about the __getattr__ method can be found here.

小开

Hesitate to add to this answer, since I'd prefer if there was an explicit way to do this with pylint. But there is a hack around solution that is working (at least as of pylint 2.7.4). In this example code I use a "getattr" null-op to prevent pylint from thinking it knows anything about the object. Obviously something this simple might not continue working going forward, but I like the fact that you can control which exact things you want pylint to ignore without having to touch anything other than source file, and without having to disable the check globally throughout the source file.

class MyClass():
"""an empty class"""


myc = MyClass()
print(myc.hello_world)  # pylint no-member
myc = globals()['myc']
print(myc.hello_world)  # no error flagged


class MyDeviceHolder1():
"""a device holder class"""
def __init__(self):
self.devices = MyClass()


mdh1 = MyDeviceHolder1()
print(mdh1.devices.hello_world)  # pylint no-member


class MyDeviceHolder2():
"""a device holder class"""
def __init__(self):
self.devices = MyClass()
self.devices = getattr(self, 'devices')


mdh2 = MyDeviceHolder2()
print(mdh2.devices.hello_world)  # no error flagged
print(mdh2.devixes.hello_world)  # pylint no-member

小开

Another possible reason for getting the no-member is, that the self argument of the __init_() method of this class is missing:

Wrong:

class foo:
def __init__(bar):
self.bar = bar

Right:

class foo:
def __init__(self, bar):
self.bar = bar

Application code to get the no-member warning:

x = foo('bar')
print(x.bar) # <-- this line will be the reported error line