Django3 runserver error

[Mira]

Hi All,

I recently upgraded Django from 2.2 to 3 on my MacOS10.13.

I am using Python 3.6 and My Application was working fine with Django 2.2 but now i am getting below error.

Any help related with this topic would be greatly appreciated.

$>python3 manage.py runserver

Watching for file changes with StatReloader

Performing system checks...

Traceback (most recent call last):

  File "manage.py", line 22, in <module>

    execute_from_command_line(sys.argv)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line

    utility.execute()

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/core/management/__init__.py", line 395, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/core/management/base.py", line 328, in run_from_argv

    self.execute(*args, **cmd_options)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 60, in execute

    super().execute(*args, **options)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/core/management/base.py", line 369, in execute

    output = self.handle(*args, **options)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 95, in handle

    self.run(**options)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 102, in run

    autoreload.run_with_reloader(self.inner_run, **options)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/utils/autoreload.py", line 599, in run_with_reloader

    start_django(reloader, main_func, *args, **kwargs)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/utils/autoreload.py", line 584, in start_django

    reloader.run(django_main_thread)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/utils/autoreload.py", line 299, in run

    self.run_loop()

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/utils/autoreload.py", line 305, in run_loop

    next(ticker)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/utils/autoreload.py", line 345, in tick

    for filepath, mtime in self.snapshot_files():

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/utils/autoreload.py", line 361, in snapshot_files

    for file in self.watched_files():

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/utils/autoreload.py", line 260, in watched_files

    yield from iter_all_python_module_files()

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/utils/autoreload.py", line 105, in iter_all_python_module_files

    return iter_modules_and_files(modules, frozenset(_error_files))

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/utils/autoreload.py", line 141, in iter_modules_and_files

    resolved_path = path.resolve(strict=True).absolute()

TypeError: resolve() got an unexpected keyword argument 'strict'

udaysingh@udays-MacBook-Pro:~/Django/dreamProj>

[Haris Ahmad]

Hi there,

Resolved_path =pathlib.path.resolve(strict=True)

Use this, might work.. 

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[Thierry DECKER]

The resolve() method dose not have the strict parameter anymore.

Regards

--

[oba stephen]

Also try using a virtual environment.

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[Amitesh Sahay]

It seems to me as if there is a mismatch of some in-built functionality. Can't say for exact though. Did you follow the migration rules from one version to another ?

Regards,

Amitesh 

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[Mira]

Thanks Thierray

I made change in Line 142 by removing removing default Parameter and its working fine for me but the question is 

is Django 3.0.8 compatible with Python 3.6? If yes we wouldn't have to make a change in Django package like i made below?

140         try:

141             #resolved_path = path.resolve(strict=True).absolute()

142             resolved_path = path.resolve().absolute()

143         except FileNotFoundError:

144             # The module could have been removed, don't fail loudly if this

145             # is the case.

146             continue

147         except ValueError as e:

148             # Network filesystems may return null bytes in file paths.

149             logger.debug('"%s" raised when resolving path: "%s"' % (str(e), path))

150             continue

151         results.add(resolved_path)

152     return frozenset(results)

153 

"/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/utils/autoreload.py" line 142 of 605 --23%-- col 13

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[ROHINI PUNDE]

I have error while updating the information,so many trials I cant solve this problem,so please help me for this

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[RANGA BHARATH JINKA]

Hi convert it into string while displaying it in models __str__.

Or use f-strings. It is easy. All the best 👍

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[RANGA BHARATH JINKA]

Send your models.py file

[ROHINI PUNDE]

from django.db import models
from django.contrib.auth.models import User

class Customer(models.Model):
    user=models.OneToOneField(User,null=True,on_delete= models.CASCADE)
    name=models.CharField(max_length=200,null=True)
    phone=models.CharField(max_length=200,null=True)
    email=models.CharField(max_length=200,null=True)
    profile_pic = models.ImageField(default="radha3.png", null=True, blank=True)
    date_created=models.DateTimeField(auto_now_add=True,null=True)
    def __str__(self):
        return self.name

class Tag(models.Model):
    name=models.CharField(max_length=200,null=True)
    def __str__(self):
        return self.name

class Product(models.Model):
    CATEGORY=(
        ('In door','In door'),
        ('Out door','Out door'),
    )
    name=models.CharField(max_length=100,null=True)
    price=models.FloatField(null=True)
    category = models.CharField(max_length=200, null=True,choices=CATEGORY)
    description = models.CharField(max_length=200,null=True,blank=True)
    date_created = models.DateTimeField(auto_now_add=True, null=True)
    tags=models.ManyToManyField(Tag)

    def __str__(self):
        return self.name


class Order(models.Model):
    STATUS = (
        ('Pending', 'Pending'),
        ('Out for delivery', 'Out for delivery'),
        ('Delivered', 'Delivered'),
    )
    customer = models.ForeignKey(Customer, null=True, on_delete=models.SET_NULL)
    product = models.ForeignKey(Product, null=True, on_delete=models.SET_NULL)
    date_created = models.DateTimeField(auto_now_add=True, null=True)
    status = models.CharField(max_length=200, null=True, choices=STATUS)
    note = models.CharField(max_length=1000, null=True)

    def __str__(self):
        return self.product.name

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[RANGA BHARATH JINKA]

from django.db import models
from django.contrib.auth.models import User

class Customer(models.Model):
    user=models.OneToOneField(User,null=True,on_delete= models.CASCADE)
    name=models.CharField(max_length=200,null=True)
    phone=models.CharField(max_length=200,null=True)
    email=models.CharField(max_length=200,null=True)
    profile_pic = models.ImageField(default="radha3.png", null=True, blank=True)
    date_created=models.DateTimeField(auto_now_add=True,null=True)
    def __str__(self):

        return str(self.name)

class Tag(models.Model):
    name=models.CharField(max_length=200,null=True)
    def __str__(self):

        return str(self.name)

class Product(models.Model):
    CATEGORY=(
        ('In door','In door'),
        ('Out door','Out door'),
    )
    name=models.CharField(max_length=100,null=True)
    price=models.FloatField(null=True)
    category = models.CharField(max_length=200, null=True,choices=CATEGORY)
    description = models.CharField(max_length=200,null=True,blank=True)
    date_created = models.DateTimeField(auto_now_add=True, null=True)
    tags=models.ManyToManyField(Tag)

    def __str__(self):

        return str(self.name)

class Order(models.Model):
    STATUS = (
        ('Pending', 'Pending'),
        ('Out for delivery', 'Out for delivery'),
        ('Delivered', 'Delivered'),
    )
    customer = models.ForeignKey(Customer, null=True, on_delete=models.SET_NULL)
    product = models.ForeignKey(Product, null=True, on_delete=models.SET_NULL)
    date_created = models.DateTimeField(auto_now_add=True, null=True)
    status = models.CharField(max_length=200, null=True, choices=STATUS)
    note = models.CharField(max_length=1000, null=True)

    def __str__(self):

        return str(self.product.name)

Try this and let me know whether it is working or not. I added str() to the __str__. All the best

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Thanks and Regards

J. Ranga Bharath

cell: 9110334114

[Kyasanku Charles Nyombi]

First of all what you did was wrong. You would have kept a Django 2.2 project in its own environment and installed the new Django version in a new environment. Another thing I would advice you is to use the latest version of python which is 3.8.4 I think with the latest version of Django. It works best there. To be on the safe side I would Advise you to rebuild your django 2.2 project with Django 3.8.4 or 3.1 because a lot has changed in these versions just fixing a single bug won’t help you will run into another one thereafter. So just do it again.

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