黄哥所写python文章

likepython · likepython · commit 51d96f75adf3 · 2016-04-19T05:49:26.000+08:00
diff --git a/python/pythonmethodchaining.md b/python/pythonmethodchaining.md
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+# python 方法链 method chaining
+
+## 写这篇文章来由，有朋友说这样的代码看不懂。
+choice = raw_input("please input:\n").strip()[0].lower()   
+很多对于有经验的程序员来说，这些都不是事，   
+但对于初学者来说，看到这样的语法头有点大。  
+
+## 这个其实是面向对象中方法链的概念。
+## 请看维基百科上Method chaining的定义  
+
+		Method chaining, also known as named parameter idiom,   
+		is a common syntax for invoking   multiple method calls 
+		in object-oriented programming languages.
+		Each method returns an   object, allowing the calls 
+		to be chained together in a single statement without requiring   
+		variables to store the intermediate results.
+		Local variable declarations are syntactic   
+		sugar because of the difficulty humans have with deeply nested method calls.
+		A method chain is also known as a train wreck due to the increase 
+		in the number of methods that come one after another in the same 
+		line that occurs as more methods are chained together
+		even though line breaks are often added between methods.
+
+## 具体在python中，请看黄哥的分析：   
+
+	有的python初学者对python方法连续调用不是很清楚，像雾里看花一样。
+	python一切都是对象，对象调用它的方法，如果带返回值，放回值也是对象，这个返回值也有方法，当然就可以用点号调用它的方法，如此下去，就是python方法链调用也。
+
+## 如何设计方法链python代码  
+
+
+	# coding:utf-8
+	"""
+	如何通过学习python学会编程
+	https://github.com/pythonpeixun/article/blob/master/python/how_to_learn_python.md
+	黄哥python远程视频培训班
+	https://github.com/pythonpeixun/article/blob/master/index.md
+	黄哥python培训试看视频播放地址
+	https://github.com/pythonpeixun/article/blob/master/python_shiping.md
+	黄哥python培训 咨询qq:1465376564
+	"""
+
+
+	class Person(object):
+	    """方法链小sample"""
+
+	    def name(self, value):
+	        self.name = value
+	        return self # 返回实例对象自己才能再调用实例对象的方法。
+
+	    def work(self, value):
+	        self.working = value
+	        return self
+
+	    def introduce(self):
+	        print "你好, 我的名字:", self.name, ",我的工作:", self.working, ",教初学者学会编程!"
+
+	person = Person()
+	person.name("黄哥").work("黄哥python培训").introduce()
+
+
+## php方法链代码  
+
+		<?php
+		/*
+		黄哥php培训 咨询qq:1465376564
+		https://github.com/pythonpeixun/article/blob/master/php_education.md
+		*/
+
+
+		class Person{
+		    public $name;
+		    public $working;
+
+		    public function setName($value){
+		        $this->name = $value;
+		        return $this;
+		    }
+
+		    public function work($value){
+		        $this->working = $value;
+		        return $this;
+		    }
+
+		    public function introduce(){
+		        echo "你好, 我的名字:".$this->name.",我的工作:".$this->working.",教初学者学会编程!\n";
+		    }
+		}
+
+		$person = new Person();
+		$person->setName("黄哥")->work("黄哥php培训")->introduce();
+
+
+[点击黄哥python培训试看视频播放地址](https://github.com/pythonpeixun/article/blob/master/python_shiping.md)
+
+[黄哥python远程视频培训班](https://github.com/pythonpeixun/article/blob/master/index.md)
+
