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What's the difference between size_t and int in C++?
...ndly Wikipedia:
The stdlib.h and stddef.h header files define a datatype called size_t which is used to represent the size of an object. Library functions that take sizes expect them to be of type size_t, and the sizeof operator evaluates to size_t.
The actual type of size_t is platform-dependent; ...
Django: “projects” vs “apps”
...views.py
and so on. Would it help if I said views.py doesn't have to be called views.py? Provided you can name, on the python path, a function (usually package.package.views.function_name) it will get handled. Simple as that. All this "project"/"app" stuff is just python packages.
Now, how are yo...
How to write a test which expects an Error to be thrown in Jasmine?
... not possible"));
you should be passing a function into the expect(...) call. Your incorrect code:
// incorrect:
expect(parser.parse(raw)).toThrow(new Error("Parsing is not possible"));
is trying to actually call parser.parse(raw) in an attempt to pass the result into expect(...),
...
Difference between this and self in JavaScript
...
A slight addition to this as people may encounter this in the context of service workers, in which case it means something slightly different.
You might see this in a service worker module:
self.addEventListener('install', function(e) {
console.log('[ServiceWorker] Install');
});
Here self r...
Can I force a page break in HTML printing?
...
Add a CSS class called "pagebreak" (or "pb"), like so:
@media print {
.pagebreak { page-break-before: always; } /* page-break-after works, as well */
}
Then add an empty DIV tag (or any block element that generates a box) where you wan...
How to open every file in a folder?
...
Os
You can list all files in the current directory using os.listdir:
import os
for filename in os.listdir(os.getcwd()):
with open(os.path.join(os.cwd(), filename), 'r') as f: # open in readonly mode
# do your stuff
Glob
Or you c...
Constantly print Subprocess output while process is running
... return_code = popen.wait()
if return_code:
raise subprocess.CalledProcessError(return_code, cmd)
# Example
for path in execute(["locate", "a"]):
print(path, end="")
share
|
impro...
Renaming columns in pandas
...UMNS
Use the df.rename() function and refer the columns to be renamed. Not all the columns have to be renamed:
df = df.rename(columns={'oldName1': 'newName1', 'oldName2': 'newName2'})
# Or rename the existing DataFrame (rather than creating a copy)
df.rename(columns={'oldName1': 'newName1', 'oldNam...
Get class name of object as string in Swift
...
Is this really the case? According to the docs for String for this initializer "an unspecified result is supplied automatically by the Swift standard library" when it doesn't conform to Streamable, or CustomStringConvertible, or Cust...
Manipulating an Access database from Java without ODBC
...
UCanAccess is a pure Java JDBC driver that allows us to read from and write to Access databases without using ODBC. It uses two other packages, Jackcess and HSQLDB, to perform these tasks. The following is a brief overview of how to get it set up.
Option 1: Using...