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When I run python manage.py migrate
on my Django project, I get the following error:
Traceback (most recent call last):
File "manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "/home/hari/project/env/local/lib/python2.7/site- packages/django/core/management/__init__.py", line 363, in execute_from_command_line
utility.execute()
File "/home/hari/project/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 355, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/hari/project/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/hari/project/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 330, in execute
output = self.handle(*args, **options)
File "/home/hari/project/env/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 86, in handle
executor.loader.check_consistent_history(connection)
File "/home/hari/project/env/local/lib/python2.7/site-packages/django/db/migrations/loader.py", line 298, in check_consistent_history
connection.alias,
django.db.migrations.exceptions.InconsistentMigrationHistory: Migration admin.0001_initial is applied before its dependency account.0001_initial on database "default".
I have a user model like below:
class User(AbstractUser):
place = models.CharField(max_length=64, null=True, blank=True)
address = models.CharField(max_length=128, null=True, blank=True)
How can I solve this problem?
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django.db.migrations.exceptions.InconsistentMigrationHistory __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
django.db.migrations.exceptions.InconsistentMigrationHistory __del__: Questions
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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:
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removes a file or symbolic link.pathlib.Path.rmdir()
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We hope this article has helped you to resolve the problem. Apart from django.db.migrations.exceptions.InconsistentMigrationHistory, check other __del__-related topics.
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Abu Dhabi | 2023-03-24
I was preparing for my coding interview, thanks for clarifying this - django.db.migrations.exceptions.InconsistentMigrationHistory in Python is not the simplest one. I just hope that will not emerge anymore
San Francisco | 2023-03-24
Maybe there are another answers? What django.db.migrations.exceptions.InconsistentMigrationHistory exactly means?. I am just not quite sure it is the best method
Boston | 2023-03-24
I was preparing for my coding interview, thanks for clarifying this - django.db.migrations.exceptions.InconsistentMigrationHistory in Python is not the simplest one. Will get back tomorrow with feedback