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Python string.join(list) on object array rather than string array
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The built-in string constructor will automatically call obj.__str__:
''.join(map(str,list))
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What are the rules about using an underscore in a C++ identifier?
...r parameters. If you've come from an MFC background, you'll probably use m_foo . I've also seen myFoo occasionally.
5 An...
What are the differences between the threading and multiprocessing modules?
...nd a thread pool like this:
with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
executor.submit(job, argument)
executor.map(some_function, collection_of_independent_things)
# ...
You can even get the results of those jobs and pass them on to further jobs, wait for t...
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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What are good uses for Python3's “Function Annotations”
...re what you make of them.
They can be used for documentation:
def kinetic_energy(mass: 'in kilograms', velocity: 'in meters per second'):
...
They can be used for pre-condition checking:
def validate(func, locals):
for var, test in func.__annotations__.items():
value = locals[v...
匿名过程入门：倒计时与回调 - App Inventor 2 案例教程 · App Inventor 2 中文网
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Is it ever advantageous to use 'goto' in a language that supports loops and functions? If so, why?
...code very difficult to read without goto as well. Like this one:
#define _ -F<00||--F-OO--;
int F=00,OO=00;main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}F_OO()
{
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'uint32_t' identifier not found error
...'s custom integer types to the types expected by C. For example:
typedef __int32 int32_t;
typedef unsigned __int32 uint32_t;
/* ... etc. ... */
Hope this helps!
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How can I implement a tree in Python?
...s easy to create. For example, a binary tree might be:
class Tree:
def __init__(self):
self.left = None
self.right = None
self.data = None
You can use it like this:
root = Tree()
root.data = "root"
root.left = Tree()
root.left.data = "left"
root.right = Tree()
root.right...
Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...ssembly from gcc-4.6.4 -Os (executes in 0.709 secs):
00000000004004d2 <_ZL3addRKiS0_.isra.0>:
4004d2: 8d 04 37 lea eax,[rdi+rsi*1]
4004d5: c3 ret
00000000004004d6 <_ZL4workii>:
4004d6: 41 55 push r13
4...