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What is reflection and why is it useful?
...is in Java (imagine the object in question is foo) :
Method method = foo.getClass().getMethod("doSomething", null);
method.invoke(foo, null);
One very common use case in Java is the usage with annotations. JUnit 4, for example, will use reflection to look through your classes for methods tagged w...
Disabling browser caching for all browsers from ASP.NET
...
This is what we use in ASP.NET:
// Stop Caching in IE
Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);
// Stop Caching in Firefox
Response.Cache.SetNoStore();
It stops caching in Firefox and IE, but we haven't tried other browsers. The following response headers are added...
Using a bitmask in C#
... mask I did Mon=Math.Power(2, 0), Tues=Math.Pow(2, 1), Wed=Math.Pow(2, 2), etc. so the bit position is a little more obvious for those of use who aren't used to binary to decimal conversion. Blindy's is good too since it turns into a boolean result by shifting the masked bit.
–...
It is more efficient to use if-return-return or if-else-return?
...sing a switch construct or for Python, enumerating a dict/using a callable/etc.). Therefore almost all if-else-return are cases of guard clauses and those are always testable (mock the tested expression) without the else.
– cowbert
Mar 28 '18 at 3:22
...
Is there a MySQL command to convert a string to lowercase?
... name value:
function ColBuilder ($field_name) {
…
While ($result = DB_fetch_array($PricesResult)) {
$result[$field_name]
}
…
}
my query being:
SELECT LOWER(itemID), … etc..
needed to be changed to:
SELECT LOWER(itemID) as itemID, … etc..
...
Django - how to create a file and save it to a model's FileField?
...ite existing file, storing to the right spot, not creating duplicate files etc).
Django 1.4.1
Python 2.7.3
#Model
class MonthEnd(models.Model):
report = models.FileField(db_index=True, upload_to='not_used')
import csv
from os.path import join
#build and store the file
def write_csv():
p...
Reading specific lines only
...ked above:
>>> import linecache
>>> linecache.getline('/etc/passwd', 4)
'sys:x:3:3:sys:/dev:/bin/sh\n'
Change the 4 to your desired line number, and you're on. Note that 4 would bring the fifth line as the count is zero-based.
If the file might be very large, and cause problems...
Tool to convert Python code to be PEP8 compliant
...le Article on RealPython https://realpython.com/python-pep8/
Linters (in order of popularity):
mypy https://github.com/python/mypy linter for type checks
(PEP-484)
pycodestyle https://github.com/PyCQA/pycodestyle - good one using
PEP-8, very popular. Often used alongside of pylint and flake8 (si...
How to write a comment in a Razor view?
...
Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
...
What are dictionary view objects?
...faster to obtain, as it does not have to copy any data (keys or values) in order to be created.
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