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blog-by-raika · 2 years ago

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【 PHP 】PHP8に入門してみた 203日目 PHPの基本 ( オブジェクト指向遅延静的束縛)

PHP8技術者認定初級試験が始まるようなので試験に向けて (できるだけ)勉強しようと思います！使用する書籍は独習PHP 第4版（山田祥寛）｜翔泳社の本 (shoeisha.co.jp) となります。オブジェクト指向必殺！遅延静的束縛！遅延静的束縛（Late Static Bindings）とは、静的メソッドやプロパティを継承して利用する際、親クラスではなく呼び出し元のクラスのメソッドやプロパティを参照する仕組みです。必殺技の名前みたいですよね😉 <!DOCTYPE html> <html> <?php class ParentClass { public static $property = "parent"; public static function method() { print "parent"; …

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#PHP

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red-fox-education · 3 years ago

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zoyaamirin · 4 years ago

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A post shared by Zoya Amirin,M.Psi.,FIAS. (@zoyaamirin)

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#Repost @parentuniversity_id • • • • • • Hello, Parent! 🥰⁣ ⁣ Gak terasa sudah tiba bulan Oktober aja 😊 Tahu, gak? Di bulan Oktober Mama dan Papa akan bisa banyak belajar dari para pakar, karena kami menyiapkan banyak kelas online melalui Live Instagram yang pastinya bakal seru dan bermanfaat banget.⁣ ⁣ Papa dan Mama bisa join di salah satu bahkan semua Live Instagram kami yang kaya akan manfaat sebagai bekal menjadi Parent terbaik untuk anak. Hm, kapan lagi belajar langsung dengan orang-orang yang ahli di bidangnya 🥰 Makanya, jangan sia-siakan kesempatan emas ini, Parent wajib banget ikutan.⁣ ⁣ Yuks langsung lingkari kalender Parent! Jangan sampai kelewatan semua kelas-kelas online kami. Ingat, anak hebat lahir dari orang tua yang mau belajar!⁣ ⁣ Sudah melirik ingin ikutan kelas online yang mana nih? Komen di bawah ya😊⁣ ⁣ #parentuniversity #sekolahaprentingmillenial #sekolahnyaorangtua #betterparentbetterfuture #kelasonline #liveinstagram #onlineclass #onlineclassofthemonth #onlineclassparentuniversity #jadwalkelasonline #igtv #parentclass #parentingclass #tipsparenting #parentingindonesia #tipsmendidikanak #caramerawatanak https://www.instagram.com/p/CF_8QO3hxwu/?igshid=1a0yb2ky71twj

#repost #parentuniversity #sekolahaprentingmillenial #sekolahnyaorangtua #betterparentbetterfuture #kelasonline #liveinstagram #onlineclass #onlineclassofthemonth #onlineclassparentuniversity #jadwalkelasonline #igtv #parentclass #parentingclass #tipsparenting #parentingindonesia #tipsmendidikanak #caramerawatanak

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codehunter · 2 years ago

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Calling parent class __init__ with multiple inheritance, what's the right way?

Say I have a multiple inheritance scenario:

class A(object): # code for A hereclass B(object): # code for B hereclass C(A, B): def __init__(self): # What's the right code to write here to ensure # A.__init__ and B.__init__ get called?

There's two typical approaches to writing C's __init__:

(old-style) ParentClass.__init__(self)

(newer-style) super(DerivedClass, self).__init__()

However, in either case, if the parent classes (A and B) don't follow the same convention, then the code will not work correctly (some may be missed, or get called multiple times).

So what's the correct way again? It's easy to say "just be consistent, follow one or the other", but if A or B are from a 3rd party library, what then? Is there an approach that can ensure that all parent class constructors get called (and in the correct order, and only once)?

Edit: to see what I mean, if I do:

class A(object): def __init__(self): print("Entering A") super(A, self).__init__() print("Leaving A")class B(object): def __init__(self): print("Entering B") super(B, self).__init__() print("Leaving B")class C(A, B): def __init__(self): print("Entering C") A.__init__(self) B.__init__(self) print("Leaving C")

Then I get:

Entering CEntering AEntering BLeaving BLeaving AEntering BLeaving BLeaving C

Note that B's init gets called twice. If I do:

class A(object): def __init__(self): print("Entering A") print("Leaving A")class B(object): def __init__(self): print("Entering B") super(B, self).__init__() print("Leaving B")class C(A, B): def __init__(self): print("Entering C") super(C, self).__init__() print("Leaving C")

Then I get:

Entering CEntering ALeaving ALeaving C

Note that B's init never gets called. So it seems that unless I know/control the init's of the classes I inherit from (A and B) I cannot make a safe choice for the class I'm writing (C).

https://codehunter.cc/a/python/calling-parent-class-init-with-multiple-inheritance-whats-the-right-way

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tomssharepointdiscoveries · 6 years ago

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More state stuff

Child Components Update Their Parents' state

In the last lesson, you passed information from a stateful, parent component to a stateless, child component.

In this lesson, you’ll be expanding on that pattern. The stateless, child component will update the state of the parent component.

Here’s how that works:

1

The parent component class defines a method that calls this.setState().

For an example, look in Step1.js at the .handleClick() method.

2

The parent component binds the newly-defined method to the current instance of the component in its constructor. This ensures that when we pass the method to the child component, it will still update the parent component.

For an example, look in Step2.js at the end of the constructor() method.

3

Once the parent has defined a method that updates its state and bound to it, the parent then passes that method down to a child.

Look in Step2.js, at the prop on line 28.

4

The child receives the passed-down function, and uses it as an event handler.

Look in Step3.js. When a user clicks on the <button></button>, a click event will fire. This will make the passed-down function get called, which will update the parent’s state.

Click through the three files in order, and try to follow their chronology. Whenever you’re ready, click Next and we’ll build an example!

Step1.js

import React from 'react'; import ReactDOM from 'react-dom'; import { ChildClass } from './ChildClass';

class ParentClass extends React.Component { constructor(props) { super(props);

this.state = { totalClicks: 0 }; }

handleClick() { const total = this.state.totalClicks;

// calling handleClick will // result in a state change: this.setState( { totalClicks: total + 1 } ); } }

Step2.js

import React from 'react'; import ReactDOM from 'react-dom'; import { ChildClass } from './ChildClass';

class ParentClass extends React.Component { constructor(props) { super(props);

this.state = { totalClicks: 0 };

this.handleClick = this.handleClick.bind(this); }

handleClick() { const total = this.state.totalClicks;

// calling handleClick will // result in a state change: this.setState( { totalClicks: total + 1 } ); }

// The stateful component class passes down // handleClick to a stateless component class: render() { return ( <ChildClass onClick={this.handleClick} /> ); } }

Step3.js

import React from 'react'; import ReactDOM from 'react-dom';

export class ChildClass extends React.Component { render() { return ( // The stateless component class uses // the passed-down handleClick function, // accessed here as this.props.onClick, // as an event handler: <button onClick={this.props.onClick}> Click Me! </button> ); } }

#react

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beingdad1-blog · 7 years ago

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Question: is NCT worth doing? Are there other options? I'll probably do the free NHS class regardless but feel something more is required, not just for the information but also for making new friends in the same situation as us. I've provisionally booked us into the NCT classes. Decided after comparing the courses they offer, that the signature class looks to be best for us, but the price is a little high. I have a feeling we will book it anyways, but would be nice to know if there are other options. . #fatherhood #parenting #beingdad #kids #parents #moms #dads #children #family #dadchat #newdad #newbaby #nct #nationalchildbirthtrust #parentclasses #pregnancyadvice #antenatal #help

#beingdad #parenting #children #parentclasses #pregnancyadvice #family #dads #help #parents #nct #nationalchildbirthtrust #fatherhood #dadchat #antenatal #moms #newdad #kids #newbaby

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red-fox-education · 3 years ago

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Download REDFOXEDUCATION mobile app and get Free access to lots of learning materials created by qualified British teachers. Phonics, Conversations videos, Flashcards, E-Books, Short videos, Vocabulary, Tongue Twisters.

Learn and practice something new every day from our Conversation videos by Red Fox and Tiffany. Enjoy the learning journey!

Take a 15-minute demo class to learn how it is possible.

https://redfoxeducation.com/redfox-book-free-online-demo-class

CONTACT: +9193451 02756

MAIL ID: [email protected]

WEBSITE: www.redfoxeducation.com

Download REDFOXEDUCATION mobile app and get

Free access to lots of learning materials created by qualified British tutors.

Phonics, Conversations videos, Flashcards, E-Books, Short videos, Vocabulary, Tongue Twisters.

Learn and practice something new every day from our Conversation videos by Red Fox and Tiffany.

Enjoy the learning journey!

GooglePlay:https://bit.ly/31lO56z

AppStore: http://apple.co/39UxPwl

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red-fox-education · 3 years ago

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Download REDFOXEDUCATION mobile app and get Free access to lots of learning materials created by qualified British teachers. Phonics, Conversations videos, Flashcards, E-Books, Short videos, Vocabulary, Tongue Twisters.

Learn and practice something new every day from our Conversation videos by Red Fox and Tiffany. Enjoy the learning journey!

Take a 15-minute demo class to learn how it is possible.

https://redfoxeducation.com/redfox-book-free-online-demo-class

CONTACT: +9193451 02756

MAIL ID: [email protected]

WEBSITE: www.redfoxeducation.com

Download REDFOXEDUCATION mobile app and get

Free access to lots of learning materials created by qualified British tutors.

Phonics, Conversations videos, Flashcards, E-Books, Short videos, Vocabulary, Tongue Twisters.

Learn and practice something new every day from our Conversation videos by Red Fox and Tiffany.

Enjoy the learning journey!

GooglePlay:https://bit.ly/31lO56z

AppStore:http://apple.co/39UxPwl

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red-fox-education · 3 years ago

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Download REDFOXEDUCATION mobile app and get Free access to lots of learning materials created by qualified British teachers. Phonics, Conversations videos, Flashcards, E-Books, Short videos, Vocabulary, Tongue Twisters.

Learn and practice something new every day from our Conversation videos by Red Fox and Tiffany. Enjoy the learning journey!

GooglePlay: https://bit.ly/31lO56z

AppStore: http://apple.co/39UxPwl

Take a 15-minute demo class to learn how it is possible.

https://redfoxeducation.com/redfox-book-free-online-demo-class

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red-fox-education · 3 years ago

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Download REDFOXEDUCATION mobile app | People - Jobs | Learn English for Kids | Short videos

Enjoy the learning journey!

GooglePlay:https://bit.ly/31lO56z

AppStore:http://apple.co/39UxPwl

Take a 15-minute demo class to learn how it is possible.

https://redfoxeducation.com/redfox-book-free-online-demo-class

Please Subscribe: https://www.youtube.com/channel/UC8yFTwPOPq73pcYgVWIFFuQ

Thanks for watching!! Please LIKE, COMMENT, SUBSCRIBE and SHARE. Thank You!!!

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red-fox-education · 3 years ago

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Download REDFOXEDUCATION mobile app | People - Jobs | Learn English for Kids | Short videos

Enjoy the learning journey!

GooglePlay: https://bit.ly/31lO56z

AppStore: http://apple.co/39UxPwl

Take a 15-minute demo class to learn how it is possible.

https://redfoxeducation.com/redfox-book-free-online-demo-class

Please Subscribe: https://www.youtube.com/channel/UC8yFTwPOPq73pcYgVWIFFuQ

Thanks for watching!! Please LIKE, COMMENT, SUBSCRIBE and SHARE. Thank You!!!

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codehunter · 3 years ago

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SQLAlchemy - Writing a hybrid method for child count

I'm using Flask-SQLAlchemy, and I'm trying to write a hybrid method in a parent model that returns the number of children it has, so I can use it for filtering, sorting, etc. Here's some stripped down code of what I'm trying:

# parent.pyfrom program.extensions import dbfrom sqlalchemy.ext.hybrid import hybrid_methodclass Parent(db.Model): __tablename__ = 'parents' parent_id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(80)) children = db.relationship('Child', backref='parent', lazy='dynamic') def __init__(self, name): self.name = name @hybrid_method def child_count(self): return self.children.count() @child_count.expression def child_count(cls): return ?????# child.pyfrom program.extensions import dbfrom program.models import Parentclass Child(db.Model): __tablename__ = 'children' child_id = db.Column(db.Integer, primary_key=True) parent_id = db.Column(db.Integer, db.ForeignKey(Parent.parent_id)) name = db.Column(db.String(80)) time = db.Column(db.DateTime) def __init__(self, name, time): self.name = name self.time = time

I'm running into two problems here. For one, I don't know what exactly to return in the "child_count(cls)", which has to be an SQL expression... I think it should be something like

return select([func.count('*'), from_obj=Child).where(Child.parent_id==cls.parent_id).label('Child count')

but I'm not sure. Another issue I have is that I can't import the Child class from parent.py, so I couldn't use that code anyway. Is there any way to use a string for this? For example,

select([func.count('*'), from_obj='children').where('children.parent_id==parents.parent_id').label('Child count')

Eventually, I'll want to change the method to something like:

def child_count(cls, start_time, end_time): # return the number of children whose "date" parameter is between start_time and end_time

...but for now, I'm just trying to get this to work. Huge thanks to whoever can help me with this, as I've been trying to figure this out for a long time now.

https://codehunter.cc/a/flask/sqlalchemy-writing-a-hybrid-method-for-child-count

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