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<!DOCTYPE html>
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<title>黄哥Python培训</title>
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<article id="python-实例对象加法和字符串表示" class="article article-type-python" itemscope itemprop="blogPost">
<div class="article-meta">
<a href="/2016/08/23/实例对象加法和字符串表示/" class="article-date">
<time datetime="2016-08-23T00:22:03.000Z" itemprop="datePublished">2016-08-23</time>
</a>
</div>
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2016/08/23/实例对象加法和字符串表示/">实例对象加法和字符串表示</a>
</h1>
</header>
<div class="article-entry" itemprop="articleBody">
<p><a href="https://www.zhihu.com/question/49891849/answer/118302072" target="_blank" rel="external">有人提问</a><br>黄哥修改的代码</p>
<h2 id="Python-类有特殊的方法-add-str-等。"><a href="#Python-类有特殊的方法-add-str-等。" class="headerlink" title="Python 类有特殊的方法__add__, __str__ 等。"></a>Python 类有特殊的方法__add__, __str__ 等。</h2><pre><code>object.__add__(self, other)
object.__sub__(self, other)
object.__mul__(self, other)
object.__floordiv__(self, other)
object.__mod__(self, other)
object.__divmod__(self, other)
object.__pow__(self, other[, modulo])
object.__lshift__(self, other)
object.__rshift__(self, other)
object.__and__(self, other)
object.__xor__(self, other)
object.__or__(self, other)
</code></pre><p>上面的方法被调用时，实现了相应的二元算术运算符。(+, -, <em>, //, %, divmod(), pow(), *</em>, <<, >>, &, ^, |)<br>实例说明：<br>表达式 x + y ,如果x的类有一个__add__方法，相当于x.__add__(y) 被调用。</p>
<h2 id="类定义了-str-方法，当调用str-内置函数或Python-2的print-语句时，"><a href="#类定义了-str-方法，当调用str-内置函数或Python-2的print-语句时，" class="headerlink" title="类定义了__str__ 方法，当调用str()内置函数或Python 2的print 语句时，"></a>类定义了__str__ 方法，当调用str()内置函数或Python 2的print 语句时，</h2><p>这个方法就会被调用。</p>
<pre><code># coding:utf-8
class Point(object):
"""黄哥修改"""
def __init__(self, x, y):
self.x = x
self.y = y
def __add__(self, other):
if isinstance(other, tuple):
self.x += other[0]
self.y += other[1]
return self
elif isinstance(other, Point):
self.x += other.x
self.y += other.y
return self
def __radd__(self, other):
return self.__add__(other)
def __str__(self):
return "Point({0}, {1})".format(self.x, self.y)
__repr__ = __str__
p1 = Point(1, 2)
p2 = Point(3, 4)
p3 = Point(2, 2)
print p1 + p2 + p3
print sum([p1 + p2 + (3, 5)], p3)
print str(p3)
</code></pre><p><a href="https://github.com/pythonpeixun/article/blob/master/shanghai_weekend.md" target="_blank" rel="external">Python上海周末培训班</a></p>
<p><a href="https://pythonpeixun.github.io/2016/08/11/216%E5%B0%8F%E6%97%B6%E5%AD%A6%E4%BC%9APython/">216小时学会Python</a></p>
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</article>
<article id="post-Python列表元素分组" class="article article-type-post" itemscope itemprop="blogPost">
<div class="article-meta">
<a href="/2016/08/18/Python列表元素分组/" class="article-date">
<time datetime="2016-08-18T03:58:59.000Z" itemprop="datePublished">2016-08-18</time>
</a>
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<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2016/08/18/Python列表元素分组/">Python列表元素分组</a>
</h1>
</header>
<div class="article-entry" itemprop="articleBody">
<p><a href="https://www.zhihu.com/question/49735791" target="_blank" rel="external">知乎上有人问</a><br>Python中的列表按相同元素分割？<br>比如列表[0,0,0,1,1,2,3,3,3,2,3,3,0,0]分割成[0,0,0],[1,1],[2],[3,3,3],[2],[3,3],[0,0]</p>
<p>如何解决这样的问题呢？<br>1、首先说明，如果这样的题目都不能写出代码，原因在基本的循环判断没有搞清楚。<br>2、黄哥在<a href="https://github.com/pythonpeixun/article/blob/master/python/how_to_learn_program2.md" target="_blank" rel="external">如何训练自己的编程思路</a> 文章所说的，做习题，要像开发项目的流程一样<br>（需求－>需求分析->设计->编码->测试->交付等），<br>拿到一个习题，还没有进行分析，就匆匆忙忙敲代码，<br>这个学习方法，是不好的学习方法。</p>
<p>3、如果做这个习题，看黄哥的讲解，先要分析，分析看出是按照相邻元素是不是相同来分组。<br>设计解决方法，大问题化解为小问题，先化解为找出元素不相同的那个元素的索引，有这个索引后，再进行分组。</p>
<p>4、编码</p>
<p>代码一：</p>
<pre><code># coding:utf-8
def group_by_element(lst):
'''by 黄哥 基本思路是先取得不同元素起始的索引值，
再按照这个索引值取切片
'''
index = []
result = []
for i, _ in enumerate(lst):
if i < len(lst) - 1 and lst[i + 1] != lst[i]:
index.append(i + 1)
result.append(lst[:index[0]])
for i, item in enumerate(index):
if i < len(index) - 1:
result.append(lst[index[i]:index[i + 1]])
result.append(lst[item:])
return result
if __name__ == '__main__':
lst = [0, 0, 0, 1, 1, 2, 3, 3, 3, 2, 3, 3, 0, 0]
group = group_by_element(lst)
print group
</code></pre><p>代码二：</p>
<pre><code># coding:utf-8
def group_by_element(lst):
'''by 黄哥 基本思路是先取得不同元素起始的索引值，
再按照这个索引值,用生成器分组。
'''
index = []
for i, _ in enumerate(lst):
if i < len(lst) - 1 and lst[i + 1] != lst[i]:
index.append(i + 1)
def take(lst, n):
for i in range(n):
yield next(lst)
if not hasattr(lst, 'next'):
lst = iter(lst)
begin = 0
for item in index:
x = list(take(lst, item - begin ))
begin = item
yield x
yield list(lst)
if __name__ == '__main__':
lst = [0, 0, 0, 1, 1, 2, 3, 3, 3, 2, 3, 3, 0, 0]
group = group_by_element(lst)
print list(group)
</code></pre><p>思路三：<br>基本思路用一个二维list [[]], 遍历list，判断前后元素是不是相等，如果相等添加到result[-1]，<br>如果不相等，需要添加一个空[]。</p>
<pre><code># coding:utf-8
def group_by_element(lst):
'''by 黄哥 基本思路用一个二维list [[]], 遍历list
判断前后元素是不是相等，如果相等添加到result[-1]，如果
不相等，需要添加一个空[]
'''
result = [[]]
length = len(lst)
for i in range(length):
if i < length - 1:
if lst[i] == lst[i + 1]:
result[-1].append(lst[i])
else:
result[-1].append(lst[i])
result.append([])
result[-1].append(lst[i])
return result
if __name__ == '__main__':
lst = [0, 0, 0, 1, 1, 2, 3, 3, 3, 2, 3, 3, 0, 0]
group = group_by_element(lst)
print group
</code></pre><p><a href="https://github.com/pythonpeixun/article/blob/master/python/hours_216.md" target="_blank" rel="external">216小时学会Python</a> </p>
<p><a href="https://github.com/pythonpeixun/article/blob/master/python_shiping.md" target="_blank" rel="external">点击黄哥python培训试看视频播放地址</a></p>
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<article id="post-216小时学会Python" class="article article-type-post" itemscope itemprop="blogPost">
<div class="article-meta">
<a href="/2016/08/11/216小时学会Python/" class="article-date">
<time datetime="2016-08-11T03:13:25.000Z" itemprop="datePublished">2016-08-11</time>
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<a class="article-title" href="/2016/08/11/216小时学会Python/">216小时学会Python</a>
</h1>
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<div class="article-entry" itemprop="articleBody">
<p>216小时是怎么来的，学习三个月，周一到周五学习2小时，周六、周日每天学习4小时。</p>
<p>学习途径：跟着黄哥的视频学习，写作业，答疑。</p>
<p>目标：三个月可以到达自己写代码解决问题的能力。</p>
<pre><code>第一目标是：通过学习python学会编程 。
第二目标：会写爬虫，网页采集。
第三目标：学会web开发。
</code></pre><p><a href="https://github.com/pythonpeixun/article/blob/master/index.md" target="_blank" rel="external">黄哥python远程视频培训</a></p>
<p>咨询qq:1465376564</p>
<p><a href="https://github.com/pythonpeixun/article/blob/master/python/how_to_learn_program2.md" target="_blank" rel="external">如何训练自己的编程思路</a></p>
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<p><a href="https://github.com/pythonpeixun/article/blob/master/python/thanks.md" target="_blank" rel="external">感恩！感谢黄哥Python培训学员的支持和肯定。</a></p>
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