Assertions are used not to perform testing of input parameters, but to verify that program flow is corect -- i.e., that you can make certain assumptions about your code at a certain point in time. In other words: a test done with Debug.Assert should always assume that the value tested is true.
Debu...
For multiple quotechars use regex in place of sep:
df = pd.read_csv(log_file,
sep=r'\s(?=(?:[^"]*"[^"]*")*[^"]*$)(?![^\[]*\])',
engine='python',
usecols=[0, 3, 4, 5, 6, 7, 8],
names=['ip', 'time', 'request', 'statu...
Any loop may be terminated or continued early at any point by using the Exit or Continue statements.
Exiting
You can stop any loop by exiting early. To do this, you can use the keyword Exit along with the name of the loop.
LoopExit StatementForExit ForFor EachExit ForDo WhileExit DoWhileExit Whil...
You can set a setUp and tearDown function.
A setUp function prepares your environment to tests.
A tearDown function does a rollback.
This is a good option when you can't modify your database and you need to create an object that simulate an object brought of database or need to init a configu...
The Python interpreter compiles code to bytecode before executing it on the Python's virtual machine (see also What is python bytecode?.
Here's how to view the bytecode of a Python function
import dis
def fib(n):
if n <= 2: return 1
return fib(n-1) + fib(n-2)
# Display the disas...
CPython allows access to the code object for a function object.
The __code__object contains the raw bytecode (co_code) of the function as well as other information such as constants and variable names.
def fib(n):
if n <= 2: return 1
return fib(n-1) + fib(n-2)
dir(fib.__code__)
de...
To install NLTK with Continuum's anaconda / conda.
If you are using Anaconda, most probably nltk would be already downloaded in the root (though you may still need to download various packages manually).
Using conda:
conda install nltk
To upgrade nltk using conda:
conda update nltk
With a...
There are many compilers that support different versions of the OpenMP specification. OpenMP maintains a list here with the compiler that support it and the supported version. In general, to compile (and link) an application with OpenMP support you need only to add a compile flag and if you use the ...
Given this setup code:
var dict = new Dictionary<int, string>()
{
{ 1, "First" },
{ 2, "Second" },
{ 3, "Third" }
};
Use the Remove method to remove a key and its associated value.
bool wasRemoved = dict.Remove(2);
Executing this code remo...
In Julia, a for loop can contain a comma (,) to specify iterating over multiple dimensions. This acts similarly to nesting a loop within another, but can be more compact. For instance, the below function generates elements of the Cartesian product of two iterables:
function cartesian(xs, ys)
f...
Julia provides macros to simplify distributing computation across multiple machines or workers. For instance, the following computes the sum of some number of squares, possibly in parallel.
function sumofsquares(A)
@parallel (+) for i in A
i ^ 2
end
end
Usage:
julia> sumo...
Although not traditionally considered loops, the @goto and @label macros can be used for more advanced control flow. One use case is when the failure of one part should lead to the retry of an entire function, often useful in input validation:
function getsequence()
local a, b
@label start
...
pushunique!(A, x) = x in A ? A : push!(A, x)
The ternary conditional operator is a less wordy if...else expression.
The syntax specifically is:
[condition] ? [execute if true] : [execute if false]
In this example, we add x to the collection A only if x is not already in A. Otherwise, we jus...
d = Dates.dayofweek(now())
if d == 7
println("It is Sunday!")
elseif d == 6
println("It is Saturday!")
elseif d == 5
println("Almost the weekend!")
else
println("Not the weekend yet...")
end
Any number of elseif branches may be used...
shift(x) = ifelse(x > 10, x + 1, x - 1)
Usage:
julia> shift(10)
9
julia> shift(11)
12
julia> shift(-1)
-2
The ifelse function will evaluate both branches, even the one that is not selected. This can be useful either when the branches have side effects that must be evaluat...
A simplest Oozie application is consists of a workflow logic file (workflow.xml), workflow properties file (job.properties/job.xml) and required JAR files, scripts and configuration files. Except the workflow properties file, all the other files should to be stored in a HDFS location. The workflow p...
MySQLi is a PHP Extension which enables PHP to communicate with MySQL Databases. MySQLi comes built in with PHP. MySQLi was introduced with PHP 5.0.
For More details about Installations Refer official PHP MySQLi Documentation
Here is a class (Dog) creating its own dependency (Food):
class Dog {
public Dog() {
var food = new Food();
this.eat(food);
}
}
Here is the same class being injected with its dependency using constructor injection:
class Dog {
public Dog(Food food) {
...
