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How can I store / cache values from methods in a class for later use in other methods of the same class?


How can I store / cache values from methods in a class for later use in other methods of the same class?

By : user2172049
Date : October 24 2020, 08:10 PM
I hope this helps . I am writing a linear regression class which fits a model to some data, similar to the scikit-learn implementation. , I would store it as an instance-level property:
code :
def __init__(self):
    self.w = None  # define the prop here...
    ....

def fit(self, x, y):
    """Fit a model to data x with targets y"""
    ...
    # model weights w are calculated here
    self.w = your_computed_value

def predict(self, x):
    """Predict the target variable of the data x using trained weights w"""
    ...
    # predicted y values, y_pred, are calulated here
    do_something_here(self.w)
    return y_pred


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Using class/static methods as default parameter values within methods of the same class

Using class/static methods as default parameter values within methods of the same class


By : Christopher Smith
Date : March 29 2020, 07:55 AM
like below fixes the issue Maybe all you need is to use the function (and not the method) in the first place?
code :
class SillyWalk(object):
    def is_silly_enough(walk):
        return (False, "It's never silly enough")

    def walk(self, appraisal_function=is_silly_enough):
        self.do_stuff()
        (was_good_enough, reason) = appraisal_function(self)
        if not was_good_enough:
            self.execute_self_modifying_code(reason)
        return appraisal_function
    def do_stuff(self):
        pass
    def execute_self_modifying_code(self, problem):
        deepjuju.kiss_booboo_better(self, problem)
>>> SillyWalk.is_silly_enough
<unbound method SillyWalk.is_silly_enough>
>>> SillyWalk.walk.im_func.func_defaults[0] # the default argument to .walk
<function is_silly_enough at 0x0000000002212048>
    is_silly_enough = staticmethod(is_silly_enough)
Python: class methods calling other class methods when initial method is called from within another class

Python: class methods calling other class methods when initial method is called from within another class


By : VRyan
Date : March 29 2020, 07:55 AM
I hope this helps you . __init__ isn't called until you create an instance. If you create an instance:
code :
a = Foo()
Why do methods inside a class become instance methods instead of becoming singleton methods of the class itself?

Why do methods inside a class become instance methods instead of becoming singleton methods of the class itself?


By : KNKim
Date : March 29 2020, 07:55 AM
wish helps you It works similarly to message sends and constant lookup:
The general format of a message send is foo.bar, which sends the message bar to foo. If you leave out foo, the message will be sent to the default receiver (which is self). The general format of a constant lookup is Foo::Bar, which looks up the constant Bar in the module Foo. If you leave out Foo, the constant will be looked up in the default constant context (or cref).
Store User Values in Python Game Using Class Methods

Store User Values in Python Game Using Class Methods


By : ranpichu123
Date : March 29 2020, 07:55 AM
hope this fix your issue IIRC, in battleship there are really four boards. One is managed by each player with their shots at the enemy, and the other is the player's own ships and incoming shots from the enemy.
The "shot" process is one of notifying the enemy where the shot was taken, the enemy responding with "hit" or "miss", and recording the result on the local player's outgoing-shots board.
code :
def play(self):
    p1 = self.player[0]
    p2 = self.player[1]

    try:
        while True:
            self.attack(p1, p2)
            self.attack(p2, p1)

    except Victory v:
        print("The winner is", v.player.name)
move = player1.get_move()
if valid_move(move):
    ...
player1.make_move()
How to bind pure virtual methods form class A to methods of class B in child of both without lots of code?

How to bind pure virtual methods form class A to methods of class B in child of both without lots of code?


By : Chege N.
Date : March 29 2020, 07:55 AM
I hope this helps . Note that as a result of the OP's question update I totally threw away my original answer and replaced it with this one.
I don't see a way to avoid spelling out all the functions in an interface but you can make all the delegation happen once in a CRTP base class rather than delegating from the child upwards. If your code is suitably templated already you can even remove the pure virtual base interface and work only with the CRTP base.
code :
class MyControl
{
public:
    virtual void show() = 0;
};

template <typename Child, typename Impl>
class MyControlInterposer : public MyControl
{
    void show() override { static_cast<Impl*>(static_cast<Child*>(this))->show(); }
};

class QWidget
{
public:
    void show()
    {
        std::cout << "QWidget::show()" << std::endl;
    }
};

class QAction
{
};

class WidgetControl: public MyControlInterposer<WidgetControl, QWidget>, public QWidget
{
public:
    WidgetControl(): MyControlInterposer(), QWidget() {}
};

class ActionControl: public MyControlInterposer<ActionControl, ActionControl>, public QAction
{
public:
    ActionControl(): MyControlInterposer(), QAction() {}
public:
    void show() {
        // do another actions, since QAction cannot show() and hide(). Instead it's possible to remove or add it to parent QMenu
        std::cout << "ActionControl::show()" << std::endl;
    }
};

int main()
{
    MyControl* control1 = new WidgetControl();
    MyControl* control2 = new ActionControl();
    control1->show();
    control2->show();
}
QWidget::show()
ActionControl::show()
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