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Two way/reverse map [duplicate]
...ic that you want. Here's a basic example:
class TwoWayDict(dict):
def __setitem__(self, key, value):
# Remove any previous connections with these values
if key in self:
del self[key]
if value in self:
del self[value]
dict.__setitem__(self,...
Java: Calling a super method which calls an overridden method
... we call the method
over here...
| +----------------+
_____/ | super |
/ +----------------+
| +------------+ | bar() |
| | this | | foo() |
| +------------+ | method0() |
+-> | @method1() |...
Python Sets vs Lists
... as lists, except for their immutability.
Iterating
>>> def iter_test(iterable):
... for i in iterable:
... pass
...
>>> from timeit import timeit
>>> timeit(
... "iter_test(iterable)",
... setup="from __main__ import iter_test; iterable = set(range(1...
efficient circular buffer?
...1] #[10, 11, 3, 8] 3, 11
Class:
class circularlist(object):
def __init__(self, size, data = []):
"""Initialization"""
self.index = 0
self.size = size
self._data = list(data)[-size:]
def append(self, value):
"""Append an element"""
if le...
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...
How do I get logs/details of ansible-playbook module executions?
...dd the following lines to your ansible configuration file:
[defaults]
log_path=/path/to/logfile
Ansible will look in several places for the config file:
ansible.cfg in the current directory where you ran ansible-playbook
~/.ansible.cfg
/etc/ansible/ansible.cfg
...
How to get the return value from a thread in python?
...cutor() as executor:
future = executor.submit(foo, 'world!')
return_value = future.result()
print(return_value)
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...
SQL Server Insert if not exists
...ode
BEGIN
INSERT INTO EmailsRecebidos (De, Assunto, Data)
VALUES (@_DE, @_ASSUNTO, @_DATA)
WHERE NOT EXISTS ( SELECT * FROM EmailsRecebidos
WHERE De = @_DE
AND Assunto = @_ASSUNTO
AND Data = @_DATA);
END
replace with
BEGIN
I...
Remove an item from array using UnderscoreJS
...
name: 'b'
}, {
id: 3,
name: 'c'
}];
//substract third
arr = _.without(arr, _.findWhere(arr, {
id: 3
}));
console.log(arr);
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
Although, since you are creating a n...
Try catch statements in C
...ou can simulate them to a degree with setjmp and longjmp calls.
static jmp_buf s_jumpBuffer;
void Example() {
if (setjmp(s_jumpBuffer)) {
// The longjmp was executed and returned control here
printf("Exception happened here\n");
} else {
// Normal code execution starts here
Te...