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What is the meaning of single and double underscore before an object name?
...owever, nothing special is done with the name itself.
To quote PEP-8:
_single_leading_underscore: weak "internal use" indicator. E.g. from M import * does not import objects whose name starts with an underscore.
Double Underscore (Name Mangling)
From the Python docs:
Any identifier of th...
Drop all tables whose names begin with a certain string
...is did not work for me. The answer to this question worked: stackoverflow.com/questions/5116296/…
– Ayushmati
May 11 at 19:18
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What __init__ and self do on Python?
...
In this code:
class A(object):
def __init__(self):
self.x = 'Hello'
def method_a(self, foo):
print self.x + ' ' + foo
... the self variable represents the instance of the object itself. Most object-oriented languages pass this as a hidd...
Static methods in Python?
...wed in other languages, but it is anyway considered a bad practice and the compiler always warns about it
– SomethingSomething
May 22 '17 at 15:40
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Django get the static files URL in view
...uest.build_absolute_uri(staticfiles_storage.url('my-static-image.png'))
# 'http://localhost:8000/static/my-static-image.png'
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Is there a MySQL option/feature to track history of changes to records?
...ld vs new is available and the date this took place. Is there a feature or common technique to do this?
8 Answers
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Standard alternative to GCC's ##__VA_ARGS__ trick?
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It is possible to avoid the use of GCC's ,##__VA_ARGS__ extension if you are willing to accept some hardcoded upper limit on the number of arguments you can pass to your variadic macro, as described in Richard Hansen's answer to this question. If you do not want to hav...
Simple way to encode a string according to a password?
...asual observer, and you aren't looking to use third party libraries. I'd recommend something like the Vigenere cipher. It is one of the strongest of the simple ancient ciphers.
Vigenère cipher
It's quick and easy to implement. Something like:
import base64
def encode(key, string):
encoded_c...
How to check file MIME type with javascript before upload?
...);
}
function getRemoteFileHeader(url, callback) {
var xhr = new XMLHttpRequest();
// Bypass CORS for this demo - naughty, Drakes
xhr.open('GET', '//cors-anywhere.herokuapp.com/' + url);
xhr.responseType = "blob";
xhr.onload = function() {
callback(url, xhr.response);
};
...
Calling class staticmethod within the class body?
...
staticmethod objects apparently have a __func__ attribute storing the original raw function (makes sense that they had to). So this will work:
class Klass(object):
@staticmethod # use as decorator
def stat_func():
return 42
_ANS = stat_func...