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Elegant Python function to convert CamelCase to snake_case?
...name
If you do this many times and the above is slow, compile the regex beforehand:
pattern = re.compile(r'(?<!^)(?=[A-Z])')
name = pattern.sub('_', name).lower()
To handle more advanced cases specially (this is not reversible anymore):
def camel_to_snake(name):
name = re.sub('(.)([A-Z][a-z]+...
Calling class staticmethod within the class body?
...2E3CBA8>
>>> dir(z)
['__class__', '__delattr__', '__doc__', '__format__', '__func__', '__get__', '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__']
>>> z.__func__
<funct...
When to use Comparable and Comparator
...e sorting was an unusual use of the class, or the sorting only makes sense for a specific use case, then a Comparator is a better option.
Put another way, given the class name, is it clear how a comparable would sort, or do you have to resort to reading the javadoc? If it is the latter, odds are ev...
What is __gxx_personality_v0 for?
...
It is used in the stack unwiding tables, which you can see for instance in the assembly output of my answer to another question. As mentioned on that answer, its use is defined by the Itanium C++ ABI, where it is called the Personality Routine.
The reason it "works" by defining it a...
Why does ReSharper tell me “implicitly captured closure”?
...ted as long as the first lambda is in use.
The compiler generates a class for both lambda expressions and puts all variables in that class which are used in the lambda expressions.
So in my example g and i are held in the same class for execution of my delegates. If g is a heavy object with a lot ...
Are there legitimate uses for JavaScript's “with” statement?
...laring a closure in a loop is a common task where this can lead to errors:
for (var i=0; i<3; ++i)
{
var num = i;
setTimeout(function() { alert(num); }, 10);
}
Because the for loop does not introduce a new scope, the same num - with a value of 2 - will be shared by all three functions.
A n...
How to find the JVM version from a program?
... Java Runtime Environment version date, in ISO-8601 YYYY-MM-DD format, which may be interpreted as a LocalDate
java.vendor "Oracle Corporation" "Oracle Corporation" "Sun Microsystems Inc." Java Runt...
Delete column from pandas DataFrame
...en a column is to be removed, the DataFrame needs to have its own handling for "how to do it". In the case of del df[name], it gets translated to df.__delitem__(name) which is a method that DataFrame can implement and modify to its needs. In the case of del df.name, the member variable gets removed ...
Explaining Python's '__enter__' and '__exit__'
...
@Grief : For 2 reasons, In my opinion, 1) i won't be able to call other methods on self object as explained here : stackoverflow.com/questions/38281853/… 2) self.XYZ is just part of self object and returning handle only to just tha...
How to modify a global variable within a function in bash?
...unc() {
echo "Hello"
}
var="$(myfunc)"
echo "$var"
Gives:
Hello
For a numerical value from 0-255, you can use return to pass the number as the exit status:
mysecondfunc() {
echo "Hello"
return 4
}
var="$(mysecondfunc)"
num_var=$?
echo "$var - num is $num_var"
Gives:
Hello - ...