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What is __pycache__?
...all of these folders in your project by running following command from the root folder of your project.
find . -name '__pycache__' -exec chflags hidden {} \;
Replace __pycache__ with *.pyc for Python 2.
This sets a flag on all those directories (.pyc files) telling Finder/Textmate 2 to exclude ...
Mechanisms for tracking DB schema changes [closed]
...se.
Make a backup of the current database (because stuff will go wrong) [mysqldump].
Create bookkeeping table (called _meta) if it doesn't exist.
Read current VERSION from _meta table. Assume 0 if not found.
For all .sql files numbered higher than VERSION, execute them in order
If one of t...
How to get last inserted id?
...
I'm coming from a mysql background, I can't understand this command: Int32 newId = (Int32) myCommand.ExecuteScalar();
– Naguib Ihab
May 28 '15 at 1:23
...
How to copy from CSV file to PostgreSQL table with headers in CSV file?
...because it uses native DB import commands. It supports Postgres as well as MYSQL and MS SQL.
import pandas as pd
df = pd.read_csv('table.csv')
uri_psql = 'postgresql+psycopg2://usr:pwd@localhost/db'
d6tstack.utils.pd_to_psql(df, uri_psql, 'table')
It is also useful for importing multiple CSVs, so...
Does a UNIQUE constraint automatically create an INDEX on the field(s)?
...email, user_id) is enough, you don't need a separate index on email only - MySQL can use leftmost parts of a composite index. There may be some border cases where the size of an index can slow down your queries, but you should not worry about them until you actually run into them.
As for testing in...
Does Foreign Key improve query performance?
...
foreign keys do improve performance, at least in MySQL. Moreover, you're right, the creation of a FK does not create an index; the creation of a FK requires an index
– Félix Gagnon-Grenier
Aug 26 '14 at 17:31
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Django 1.7 throws django.core.exceptions.AppRegistryNotReady: Models aren't loaded yet
...This works for me for Django 1.9 . The Python script to execute was in the root of the Django project.
import django
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "PROJECT_NAME.settings")
django.setup()
from APP_NAME.models import *
Set PROJECT_NAME and APP_NAME to yours
...
ASP.NET 2.0 - How to use app_offline.htm
I've read about the app_offline.htm file which can be placed within the root of a .NET 2.0 application which will in essence shut down the application and disable any other pages from being requested.
...
Subprocess changing directory
...ediately before executing a subprocess.
For example, to execute ls in the root directory, you either can do
wd = os.getcwd()
os.chdir("/")
subprocess.Popen("ls")
os.chdir(wd)
or simply
subprocess.Popen("ls", cwd="/")
s...
Nginx 403 error: directory index of [folder] is forbidden
... Throwing the error mentioned by OP.
try_files $uri $uri/ means, from the root directory, try the file pointed by the uri, if that does not exists, try a directory instead (hence the /). When nginx access a directory, it tries to index it and return the list of files inside it to the browser/client...