[[DA series - Learn Python with Steem]](https://steemit.com/da-learnpythonwithsteem/@deanliu/da-series-learn-python-with-steem-00-coding) 是DA(@deanliu & @antonsteemit)關於「從Python程式語言實做Steem區塊鏈的入門」的系列,歡迎趕緊入列學習! 前情提要:[[DA series - Learn Python with Steem #06] 函式](https://steemit.com/da-learnpythonwithsteem/@deanliu/da-series-learn-python-with-steem-06) https://steemitimages.com/0x0/https://cdn.steemitimages.com/DQmbeN1PpqQC2JE5HbpXatb3apUfFhe68fPLctT95FiiRHq/cover.png 第#07堂課,今天我們來學習Python的~~**類別** ! ## Python的類別(Class) 今天我們來介紹**類別**(class),應該算是程式語言中比較進階的概念了。學完這部份之後,就差不多把程式的基本概念都大致帶過了,我們就可以來試試撰寫一些比較有趣實用的程式了。 ## Class 什麼是class呢?其實我覺得中文的翻譯「類別」翻的挺不錯的。在程式設計的過程中,我們可以把一些「屬於同的類別」的東西放在一起,類似組成一個新的「物件」。這麼做最主要也是為了建構好理解的程式架構,讓我們在未來的呼叫中可以更得心應手。相信各位看到這裡應該完全聽不明白吧!這也是我第一次看到「Class」時的反應。沒關係,我們舉一個簡單的例子就可以了。 例如我們要設計一個程式時,要使用一些變數紀錄兩位使用者的姓名、身高、體重、性別等等。如果我們用之前的學過的東西,可能需要利用一個浮點數(float)變數來紀錄身高、體重,利用字串(string)來紀錄名字。如下: ``` my_name= 'Anton' my_height = 1.75 my_weigt = 65 my_gender = 'male' your_name = 'Felicity' your_height = 1.6 your_weight = 53 your_gender = 'female' ``` 目前看起來還算OK,並沒有太難看。但如果東西一多了,很容易整個程式變得混亂。Class就是在這種「多個大物件是由類似的小零件組成時」,可以拿來使用。在上面這個例子中,當我的程式撰寫到這個部份時,我意識到其實我是試著要用一些變數描述兩個「人」,而**Anton**跟**Felicity**都個別是一個「人」。這時我們就可以設計一個「人的Class」,並且規定:這個class裡面的元素就是我們描述一個「人」所需要的小部份,例如姓名、身高、體重、性別。或是說,身高體重等等是**屬於「人」這個大概念的「屬性」**。我們先以這些東西撰寫一個簡單的Class: (參考程式碼位於[tutorial_7.py](https://github.com/antoncoding/Python-x-Steem-tutorial/blob/master/tutorial_7.py))  一開始跟在關鍵字`class`後面的`Person`就是這個類別的名字,通常以大寫表示。 接著看到class裡面的第一行,是一個像是 Function一樣的**def**關鍵字。在這裡這些「class的內建小function」被稱為methods(後面會有更完整介紹),而這邊看到的第一個:`__init__`(前後都有兩個底線)的method比較特別,是所有class都一定要有的method,意思為「initiate」,也就是「創建這個class的method」,或稱為Contructor。 在這個「創世method」裡面,我們丟入`(self, _name, _height, _weight, _gender)`五個參數。首先,所有的Class裡面的method的第一個參數都一定是**self**,代表他是屬於某一個class的method,而不是一個function。這個self指的就是class本身,而在這個method裡面,我們也會用self來帶指「現在這個class」。 所以在這個`__init__`這個method裡面,我們的就只是把其他接到的參數Assign給**Class裡面的 屬性(attributes),也就是這個「人」物件的個資**。可以把這些attributes想像成class的內建變數,例如我的init內容是 ``` self.name = _name ``` 其中_name是我在外面創立這個class時傳送近來的參數,我把他指定給self(也就是這個class)底下一個叫做`name`的 attribute。同樣的道理應用在其他的參數中,所以在創立這個class的時候,我就已經將這個特殊的「人」的各個特徵都寫好到這個Class的各個屬性裡面了。 我後面主程式的部份寫到 ``` me = Person('Anton',1.75, 65, 'Male') print(me.name) print(me.height) ``` 所以現在 **me就是一個Person的物件**,當我們想要看看me內建了哪些屬性的時候,我們可以透過類似上面的`me.name`等叫法來取出。所以,上面這段程式碼執行結果為: ``` Anton 1.75 ``` ## Methods 接著我們來試試看寫Person這個class裡面的method。 長話短說,attribute就是class裡面內建的變數(如剛剛的name),method就是class裡面內建的function。我們可以仿造上次計算BMI的function,但這次把他寫在這個大class裡面,成為一個活在Person這個大物件之下的內建method。基本上邏輯沒什麼不同:  不過這個method不像之前設計的function需要傳入(weight, height),因為規定好一定要傳入的`self`,也就是**這個class自己**,裡面已經包含了我們需要的訊息。在同一個class裡面的method可以自由使用同一個class裡面的attributes(剛剛說的name,height等等)以及其他method。所以在`get_bmi`這個method裡面,我們只要寫 **self.weight**他就會去取得「這個Person物件的體重」,使用**self.height**就會取得「這個Person物件的height」。 因此最後我們可以使用 ``` me = Person('Anton',1.75, 65, 'Male') print(me.get_bmi()) ``` 他就會知道我們是要使用**me**這個「Person類別」,呼叫裡面的內建的get_bmi() method。執行結果就會是:21.224啦 ## Functions and Methods 其實method這個字我們在先前的教學中就有提到了,例如List裡面的**append**、Dictionary的`.update()`都是常用的method。如上面所說,method有點像是那些物件的**內建功能**。例如:List這個物件有個內建的功能是`.append()`用來加上某個元素、Dictionary這個物件有個內建功能是`.update()`,可以用來更新字典;而String這種物建有個內建功能是`split()`,是將字串依照split()裡面的東西切斷。這些method僅存於某種class物件之下,所以我們學list時要學習它之下好用的methods,往往可以省去我們不少開發心力。 一個很好分辨別人寫的code是method還是function的方法是,兩者的呼叫方法有很大的不同:method是某個class的內建功能,因此必定是透過`class.method()`這樣的格式。如剛剛的: ``` me.get_bmi() ``` 或是一些比較常用的method: ``` myList = [] myList.append('hey') myDictionary = {} myDictionary.update({'Amy':0906888222}) ``` 反觀我們上期學的function,用法會長的比較直接,不用接在誰的後面和誰的`.`後面,如: ``` print('I love you') ``` ## Homework time:練習題! 今天的練習題比較特別一點:希望大家一起來試試看在我們今天Person這個class之下加上別的method以及attribute。其中要大家試試看設計一個rename()的method,呼叫時只要傳入(name),用來更新我剛剛創件的Person物件。其中再用另一個attribute:**count_update**紀錄這個class一共被變更過幾次。 例如我的主程式部份輸入為: ``` me = Person('Anton',1.75, 65, 'Male') print(me.name) me.rename('Antoooon') me.rename('Antonazzo') print('========= After Update ===========') print(me.name) print(me.count_update) ``` 輸出 ``` Anton ========= After Update =========== Antonazzo 2 ``` 祝大家好運啦!參考解答:[tutorial_7_exercise.py](https://github.com/antoncoding/Python-x-Steem-tutorial/blob/master/tutorial_7_exercise.py) 我們下篇文章再見囉~下課!  <sub>*image - pixabay*</sub>
author | deanliu |
---|---|
permlink | da-series-learn-python-with-steem-07 |
category | da-learnpythonwithsteem |
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第一个交作业拉~ 
author | shine.wong |
---|---|
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怎麼不換成自己的名字勒xD
author | antonsteemit |
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自己的數值不好看,用你的只要複製黏貼呀,哈哈哈,懶癌晚期不是蓋的🤣 Posted using [Partiko Android](https://play.google.com/store/apps/details?id=io.partiko.android)
author | shine.wong |
---|---|
permlink | shine-wong-re-antonsteemit-re-shinewong-re-deanliu-da-series-learn-python-with-steem-07-20180806t100720116z |
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Congratulations @deanliu! You have completed the following achievement on Steemit and have been rewarded with new badge(s) : [](http://steemitboard.com/@deanliu) You published a post every day of the week <sub>_Click on the badge to view your Board of Honor._</sub> <sub>_If you no longer want to receive notifications, reply to this comment with the word_ `STOP`</sub> To support your work, I also upvoted your post! > Do you like [SteemitBoard's project](https://steemit.com/@steemitboard)? Then **[Vote for its witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1)** and **get one more award**!
author | steemitboard |
---|---|
permlink | steemitboard-notify-deanliu-20180806t065817000z |
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学完这节课,是不是可以小学毕业了?:D 
author | yjcps |
---|---|
permlink | re-deanliu-da-series-learn-python-with-steem-07-20180807t023637754z |
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哎呀,你這麼一說,我開始想要賣區塊鏈上的文憑了~~~呵呵呵~~~貪財貪財,不可不可~~~
author | deanliu |
---|---|
permlink | re-yjcps-re-deanliu-da-series-learn-python-with-steem-07-20180807t082828411z |
category | da-learnpythonwithsteem |
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可行,第一个基于steem区块链的教育平台。
author | yjcps |
---|---|
permlink | re-deanliu-re-yjcps-re-deanliu-da-series-learn-python-with-steem-07-20180807t130257704z |
category | da-learnpythonwithsteem |
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