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Difference between “@id/” and “@+id/” in Android
...riginal question.
Well, it depends on the context, when you're using the XML attribute of android:id, then you're specifying a new id, and are instructing the parser (or call it the builder) to create a new entry in R.java, thus you have to include a + sign.
While in the other case, like android:...
How to randomly select an item from a list?
...orrect', 'horse', 'staple']
print(secrets.choice(foo))
secrets is new in Python 3.6, on older versions of Python you can use the random.SystemRandom class:
import random
secure_random = random.SystemRandom()
print(secure_random.choice(foo))
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Get loop count inside a Python FOR loop
In a Python for loop that iterates over a list we can write:
5 Answers
5
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原子vector的一种实现源码(atomic-vector) - C/C++ - 清泛网 - 专注C/C++及内核技术
...独立运行的版本，代码比较简单，实现分配好空间，然后对元素进行原子交换，扩容采用链表的形式，代码可直接运行。
测试代码：
HPHP::AtomicVector<float> v_atom(2, 0.f);
void atom_vector_hphp() {
v_atom.exchange(0, 1);
v_atom.exchange(1, 2);...
String concatenation vs. string substitution in Python
In Python, the where and when of using string concatenation versus string substitution eludes me. As the string concatenation has seen large boosts in performance, is this (becoming more) a stylistic decision rather than a practical one?
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Python read-only property
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Generally, Python programs should be written with the assumption that all users are consenting adults, and thus are responsible for using things correctly themselves. However, in the rare instance where it just does not make sense for ...
What will happen if I modify a Python script while it's running?
Imagine a python script that will take a long time to run, what will happen if I modify it while it's running? Will the result be different?
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How to save a dictionary to a file?
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Python has the pickle module just for this kind of thing.
These functions are all that you need for saving and loading almost any object:
def save_obj(obj, name ):
with open('obj/'+ name + '.pkl', 'wb') as f:
pi...
What's your most controversial programming opinion?
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XML is highly overrated
I think too many jump onto the XML bandwagon before using their brains...
XML for web stuff is great, as it's designed for it. Otherwise I think some problem definition and design thoughts should pree...
python date of the previous month
I am trying to get the date of the previous month with python.
Here is what i've tried:
12 Answers
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