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remove None value from a list without removing the 0 value
... - it's just for scientific purposes)
>>> from operator import is_not
>>> from functools import partial
>>> L = [0, 23, 234, 89, None, 0, 35, 9]
>>> filter(partial(is_not, None), L)
[0, 23, 234, 89, 0, 35, 9]
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Markup XML解析库下载（Markup.h 和 Markup.cpp） - 源码下载 - 清泛网 - 专注C/C++及内核技术
...n
// This software is provided "as is", with no warranty.
#if !defined(_MARKUP_H_INCLUDED_)
#define _MARKUP_H_INCLUDED_
#include <stdlib.h>
#include <string.h> // memcpy, memset, strcmp...
// Major build options
// MARKUP_WCHAR wide char (2-byte UTF-16 on Windows, 4-byte UTF-32 on Linux...
Naming convention - underscore in C++ and C# variables
It's common to see a _var variable name in a class field. What does the underscore mean? Is there a reference for all these special naming conventions?
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Python, creating objects
... ""
# The class "constructor" - It's actually an initializer
def __init__(self, name, age, major):
self.name = name
self.age = age
self.major = major
def make_student(name, age, major):
student = Student(name, age, major)
return student
Note that even tho...
Class Not Found Exception when running JUnit test
...rary but that was under the Libraries tab. Then I went to Build Path -> Order & Export -> as was able to move Maven Dependencies above JRE System library. Then I built the project and ran a Maven install, then the test ran successfully.
– Megan
Aug 2...
Passing argument to alias in bash [duplicate]
... combination of an alias and a function like this, for instance:
function __t2d {
if [ "$1x" != 'x' ]; then
date -d "@$1" ...
Python: Is it bad form to raise exceptions within __init__?
Is it considered bad form to raise exceptions within __init__ ? If so, then what is the accepted method of throwing an error when certain class variables are initialized as None or of an incorrect type?
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Calling a class function inside of __init__
...
Call the function in this way:
self.parse_file()
You also need to define your parse_file() function like this:
def parse_file(self):
The parse_file method has to be bound to an object upon calling it (because it's not a static method). This is done by calling t...
How to sort a dataFrame in python pandas by two or more columns?
... a , b and c , I want to sort the dataframe by column b in ascending order, and by column c in descending order, how do I do this?
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How do I add a placeholder on a CharField in Django?
...t specify the field (e.g. for some dynamic method), you can use this:
def __init__(self, *args, **kwargs):
super(MyForm, self).__init__(*args, **kwargs)
self.fields['email'].widget.attrs['placeholder'] = self.fields['email'].label or 'email@address.nl'
It also allows the placeholder to de...