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magic-pyth
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c2b09ece24
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47df4cda71
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299
index.html
299
index.html
@@ -12,12 +12,307 @@
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<!-- Theme used for syntax highlighted code -->
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<link rel="stylesheet" href="plugin/highlight/monokai.css">
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<style>
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big {
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font-size: 139%;
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}
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</style>
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</head>
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<body>
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<div class="reveal">
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<div class="slides">
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<section>Slide 1</section>
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<section>Slide 2</section>
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<section>
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<section>
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<h2>代码如诗</h2>
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<small>Python 代码风格规范 (PEP8)</small>
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</section>
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</section>
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<section>
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<section data-markdown>
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### 一般注释
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```python
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some_code()
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more_code_here()
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# One sentence explaining
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if not data:
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do_something_here()
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other_code()
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```
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</section>
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<section data-markdown>
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### 行内注释
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```python
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words = 'Hello, World!' # Some comment here
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something = 'Hahaha' # 注释不需要对齐
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```
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</section>
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<section data-markdown>
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#### 块注释
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```python
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# 通常在需要 review 的晦涩难懂的代码前
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# 留下 TODO、待 review 的说明
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# 不要在这里流水帐式描述你的代码
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# 如: 「此处判定列表各项均为有效值，然后我们...」
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# 要假定 reviewer 比你更懂 Python
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if 0 in [!int(node) for node in li]: # 恰到好处的注释
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```
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> 如果代码不够清晰以至于需要一个注释，那么或许它应该被重写。
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</section>
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<section data-markdown>
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#### 函数注释
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```python
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def print(arg):
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"""将 arg 打印在屏幕上
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这个函数会调用内置方法讲 arg 输出到屏幕上，
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注意这个函数不是线程安全的。
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参数：
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arg: 字符串或可以调用 arg.__str__() 的对象
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返回值:
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返回一个整数，代表输出的字符串长度
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抛出异常:
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NameError: 参数没有 __str__() 方法供转化成字符串。
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"""
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do_some_thing()
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```
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</section>
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<section data-markdown>
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#### 类注释
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```python
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class SampleClass:
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"""简单描述这个类
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详细说明这个类...
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可以有很多行说明...
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类成员说名:
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Blablabla
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"""
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def __init__(self, *args):
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"""类方法说明"""
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```
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</section>
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</section>
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<section>
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<section><h1><code>String</code></h1></section>
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<section data-markdown=>
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需要拼接有空格的字符串，运用占位符
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```python
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x = '%s, %s!' % (a, b)
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x = '{}, {}!'.format(a, b)
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x = ', '.join([a, b])
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```
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直接拼接的字符串
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```python
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x = a + b
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```
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</section>
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<section data-markdown>
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> 注意：使用加法循环拼接字符串，可能导致二次而非线性的运行时间。
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BAD
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```python
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li = ['a', 'very', 'long', 'list']
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result = ''
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for i in li:
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result = result + i
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print(result)
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```
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GOOD
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```python
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result = ''.join(li)
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print(result)
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```
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</section>
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<section data-markdown>
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当字符串过长时，使用 `\` 漂亮地分割字符串
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```python
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s = '这是一个' \
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'很长的字符串'
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```
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</section>
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</section>
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<section>
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<section>其他乱七八糟但很重要的东西</section>
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<section>
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<p>类名以<big>大</big>写字母开头 <code>ClassName</code></p>
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<p>驼峰<big>命</big>名法 <code>someFunctionName</code></p>
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<p>下划线_命名法 <code>some_variable_name</code></p>
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</section>
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<section data-markdown>
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### 遍历同时操作数组
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> 不规范的行为
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```python
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li = list(range(10))
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for i in li:
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li.append(i)
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```
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</section>
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<section data-markdown>
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### 传参传字典或列表
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```python
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def foo(i, arg=[]): # 正确做法 arg=None
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arg.append(i)
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print(arg)
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foo('a')
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# Output: ['a']
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foo('b')
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# Output: ['a', 'b']
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```
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</section>
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<section data-markdown>
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### 文件中读入的字符莫名消失
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复现代码
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```python
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raw = '第一行\n\r第二行'
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for i in raw.split('\n'):
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print('---start', i, 'end---')
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# Output:
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# ---start 第一行 end---
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# 第二行 end---
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```
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</section>
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<section data-markdown>
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GOOD
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```python
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if age < 18:
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return 'You are too small'
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do_something_here()
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```
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BAD
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```python
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if age > 18:
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do_something_here()
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else:
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return 'You are too small'
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```
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</section>
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<section data-markdown>
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#### 善用 if
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GOOD
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```python
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if data:
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break
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```
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BAD
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```python
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if data != []:
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break
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```
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</section>
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</section>
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<section>
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<section data-markdown>
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## 忍者代码
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</section>
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<section data-markdown>
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#### 没人知道这个变量是什么
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- a, b, j, k, l
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- str, string, number, list, dict
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- data
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- data1
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- data114514
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以及见鬼的缩写
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- `ObjStuAre_id`: object_student_area_id
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</section>
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<section data-markdown>
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> 一个变量，一杯茶，一个bug修一天
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- `data`
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- `date`
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- `l`
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- `I`
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</section>
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<section data-markdown>
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#### 没人知道这两是不是同一个东西
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- `showMessage`
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- `displayMessage`
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- `printMessage`
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</section>
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<section data-markdown>
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#### 夸张的变量名
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- `very_super_powerful_print_function`
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- `lovely_variable`
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- `nice_list`
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</section>
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<section data-markdown>
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#### 重叠外部命名空间变量
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```python
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id = 39
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def foo():
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id += 1
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# 一堆代码
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print(id)
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```
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</section>
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<section data-markdown>
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#### Powerful Function !
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例如某个 `check_empty_in_list()`，按字面意思会检查列表中是否有空项，可这个函数在检查到空项的同时还会「智能地」帮你删掉空项。然而使用函数的人对此一无所知，函数作者也忘了有这么回事。
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</section>
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<section>
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<p>一行！展现你的聪明才智！</p>
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<code>
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result = not os.system(' '.join(['proxychains', '-q', 'pandoc', 'README.md', 'SUMMARY.md', ' '.join([str(i)+'.md' for i in range(3, 109+1)]), '-o', '/tmp/out.epub']) or print("Failed")
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</code>
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</section>
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</section>
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<section>
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<section style="text-align: left;" data-markdown>
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#### References
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- [现代 JavaScript 教程 - 忍者代码](https://zh.javascript.infoi/ninja-code)
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- [Google Python Style Guide](https://google.github.io/styleguide/pyguide.html)
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- [水族馆](https://aquarium39.moe)
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- [你所不知道的Python冷知識](https://codertw.com/%E7%A8%8B%E5%BC%8F%E8%AA%9E%E8%A8%80/649905/)
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</section>
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</section>
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</div>
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</div>
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