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I would very much like to integrate pylint into the build process for
my python projects, but I have run into one show-stopper: One of the
error types that I find extremely useful--:E1101: *%s %r has no %r
member*
--constantly reports errors when using common django fields,
for example:
E1101:125:get_user_tags: Class "Tag" has no "objects" member
which is caused by this code:
def get_user_tags(username):
"""
Gets all the tags that username has used.
Returns a query set.
"""
return Tag.objects.filter( ## This line triggers the error.
tagownership__users__username__exact=username).distinct()
# Here is the Tag class, models.Model is provided by Django:
class Tag(models.Model):
"""
Model for user-defined strings that help categorize Events on
on a per-user basis.
"""
name = models.CharField(max_length=500, null=False, unique=True)
def __unicode__(self):
return self.name
How can I tune Pylint to properly take fields such as objects into account? (I"ve also looked into the Django source, and I have been unable to find the implementation of objects
, so I suspect it is not "just" a class field. On the other hand, I"m fairly new to python, so I may very well have overlooked something.)
Edit: The only way I"ve found to tell pylint to not warn about these warnings is by blocking all errors of the type (E1101) which is not an acceptable solution, since that is (in my opinion) an extremely useful error. If there is another way, without augmenting the pylint source, please point me to specifics :)
See here for a summary of the problems I"ve had with pychecker
and pyflakes
-- they"ve proven to be far to unstable for general use. (In pychecker"s case, the crashes originated in the pychecker code -- not source it was loading/invoking.)
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Using Pylint with Django __del__: Questions
How can I make a time delay in Python?
5 answers
I would like to know how to put a time delay in a Python script.
Answer #1
import time
time.sleep(5) # Delays for 5 seconds. You can also use a float value.
Here is another example where something is run approximately once a minute:
import time
while True:
print("This prints once a minute.")
time.sleep(60) # Delay for 1 minute (60 seconds).
Answer #2
You can use the sleep()
function in the time
module. It can take a float argument for sub-second resolution.
from time import sleep
sleep(0.1) # Time in seconds
Using Pylint with Django __del__: Questions
How to delete a file or folder in Python?
5 answers
How do I delete a file or folder in Python?
Answer #1
os.remove()
removes a file.os.rmdir()
removes an empty directory.shutil.rmtree()
deletes a directory and all its contents.
Path
objects from the Python 3.4+ pathlib
module also expose these instance methods:
pathlib.Path.unlink()
removes a file or symbolic link.pathlib.Path.rmdir()
removes an empty directory.
We hope this article has helped you to resolve the problem. Apart from Using Pylint with Django, check other __del__-related topics.
Want to excel in Python? See our review of the best Python online courses 2023. If you are interested in Data Science, check also how to learn programming in R.
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Boston | 2023-03-24
I was preparing for my coding interview, thanks for clarifying this - Using Pylint with Django in Python is not the simplest one. Will use it in my bachelor thesis
Paris | 2023-03-24
I was preparing for my coding interview, thanks for clarifying this - Using Pylint with Django in Python is not the simplest one. Checked yesterday, it works!
Massachussetts | 2023-03-24
Thanks for explaining! I was stuck with Using Pylint with Django for some hours, finally got it done 🤗. Will get back tomorrow with feedback