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I created a new app with some models and now I noticed that some of the models are poorly thought out. As I haven"t committed the code the sensible thing would be to migrate the database to last good state and redo the migration with better models. In this case the last good state is database where the new app doesn"t exist.
How can I migrate back from initial migration in Django 1.7?
In South
one could do:
python manage.py migrate <app> zero
Which would clear <app>
from migration history and drop all tables of <app>
.
How to do this with Django 1.7 migrations?
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How to migrate back from initial migration in Django 1.7? __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
How to migrate back from initial migration in Django 1.7? __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 How to migrate back from initial migration in Django 1.7?, check other __del__-related topics.
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San Francisco | 2023-03-24
Simply put and clear. Thank you for sharing. How to migrate back from initial migration in Django 1.7? and other issues with Python functions was always my weak point 😁. Will use it in my bachelor thesis
Berlin | 2023-03-24
Simply put and clear. Thank you for sharing. How to migrate back from initial migration in Django 1.7? and other issues with stat Python module was always my weak point 😁. Will use it in my bachelor thesis
Vigrinia | 2023-03-24
Thanks for explaining! I was stuck with How to migrate back from initial migration in Django 1.7? for some hours, finally got it done 🤗. Will get back tomorrow with feedback