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index f389505..4f1c607
--- a/Day16-20/16-20.Python语言进阶.md
+++ b/Day16-20/16-20.Python语言进阶.md
@@ -706,7 +706,7 @@
           return self.value < other.value
   
   
-  class Card():
+  class Card:
       """牌"""
   
       def __init__(self, suite, face):
@@ -724,7 +724,7 @@
           return self.show()
   
   
-  class Poker():
+  class Poker:
       """扑克"""
   
       def __init__(self):
@@ -749,7 +749,7 @@
           return self.index < len(self.cards)
   
   
-  class Player():
+  class Player:
       """玩家"""
   
       def __init__(self, name):
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old mode 100644
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index b63c346..86fec53
--- a/Day31-35/31-35.玩转Linux操作系统.md
+++ b/Day31-35/31-35.玩转Linux操作系统.md
@@ -1,4 +1,4 @@
-## 玩转Linux操作系统
+玩转Linux操作系统
 
 > **说明**：本文中对Linux命令的讲解都是基于名为CentOS的Linux发行版本，我自己使用的是阿里云服务器，系统版本为CentOS Linux release 7.6.1810。不同的Linux发行版本在Shell命令和工具程序上会有一些差别，但是这些差别是很小的。
 
@@ -26,11 +26,11 @@
 
 3. 1969年：MULTICS项目失败，Ken Tompson赋闲在家，为了玩“Space Travel”游戏用汇编语言在当时已经被淘汰的PDP-7上开发了Unics。
 
-   > 注：很难想象，Unix这么伟大的系统，居然是一个赋闲在家的程序员（关键是老婆回娘家还带上了孩子）在一台被淘汰的设备上为了玩游戏开发出来的。
+   > 注：很难想象，Unix这么伟大的操作系统，居然是一个赋闲在家的程序员（关键是老婆回娘家还带上了孩子）在一台被淘汰的设备上为了玩游戏开发出来的。
 
-4. 1970年~1971年：Ken Tompson和Dennis Ritchie用B语言在PDP-11上重写了Unics，并在Brian Kernighan的建议下将其更名为Unix。
+4. 1970年~1971年：Ken Thompson和Dennis Ritchie用B语言在PDP-11上重写了Unics，并在Brian Kernighan的建议下将其更名为Unix。
 
-   <img src="https://gitee.com/jackfrued/mypic/raw/master/20220516090404.png" style="zoom:50%;">
+   <img src="res/ken-and-dennis-pdp-11.png" style="zoom:62%;" />
 
 5. 1972年~1973年：Dennis Ritchie发明了C语言来取代可移植性较差的B语言，并开启了用C语言重写Unix的工作。
 
@@ -40,7 +40,7 @@
 
 8. 1987年：Andrew S. Tanenbaum教授为了能在课堂上为学生讲解操作系统运作的细节，决定在不使用任何AT&T的源代码前提下，自行开发与Unix兼容的操作系统以避免版权上的争议，该系统被命名为Minix。
 
-   <img src="https://gitee.com/jackfrued/mypic/raw/master/20220516090432.jpg" style="zoom:50%;">
+   <img src="res/andrew.jpg" style="zoom:50%;" />
 
 9. 1991年：Linus Torvalds就读于芬兰赫尔辛基大学期间，尝试在Minix上做一些开发工作，但因为Minix只是作为教学用途的操作系统，功能并不强大，为了方便在学校的新闻组和邮件系统中读写和下载文件，Linus编写了磁盘驱动程序和文件系统，这些东西形成了Linux系统内核的雏形。
 
@@ -1529,12 +1529,6 @@ build environment:
    [root ~]# kill -9 1234
    ```
 
-   例子：用一条命令强制终止正在运行的Redis进程。
-
-    ```Shell
-   ps -ef | grep redis | grep -v grep | awk '{print $2}' | xargs kill
-    ```
-
 5. 通过进程名终止进程 - **killall** / **pkill**。
 
     结束名为mysqld的进程。
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+## Python容器类型使用小技巧
+
+Python中提供了非常丰富的容器型数据类型，大家最为熟悉的有`list`、`tuple`、`set`、`dict`等。下面为大家分享一些使用这些类型的小技巧，希望帮助大家写出更加Pythonic的代码。
+
+### 从字典中取最大
+
+假设字典对象对应的变量名为`my_dict`。
+
+- 取出最大值
+
+    ```Python
+    max(my_dict.values())
+    ```
+
+- 取值最大值的键
+
+    ```Python
+    max(my_dict, key=my_dict.get)
+    ```
+
+- 取出最大值的键和值
+
+    ```python
+     max(my_dict.items(), key=lambda x: x[1])
+    ```
+
+    或
+
+    ```Python
+    import operator
+    
+    max(my_dict.items(), key=operator.itemgetter(1))
+    ```
+    
+    > **说明**：上面用到了`operator`模块的`itemgetter`函数，这个函数的的作用如下所示。在上面的代码中，`itemgetter`帮我们获取到了二元组中的第2个元素。
+    >
+    > ```Python
+    > def itemgetter(*items):
+    >     if len(items) == 1:
+    >         item = items[0]
+    >         def g(obj):
+    >             return obj[item]
+    >     else:
+    >         def g(obj):
+    >             return tuple(obj[item] for item in items)
+    >     return g
+    > ```
+
+### 统计列表元素出现次数
+
+假设列表对象对应的变量名为`my_list`。
+
+```Python
+{x: my_list.count(x) for x in set(my_list)}
+```
+
+或
+
+```Python
+from itertools import groupby
+
+{key: len(list(group)) for key, group in groupby(sorted(my_list))}
+```
+
+> **说明**：`groupby`函数会将相邻相同元素分到一个组中，所以先用`sorted`函数排序就是为了将相同的元素放到一起。
+
+或
+
+```Python
+from collections import Counter
+
+dict(Counter(my_list))
+```
+
+### 截断列表元素
+
+假设列表对象对应的变量名为`my_list`，通常大家会想到用下面的方式来截断列表。
+```Python
+my_list = my_list[:i]
+my_list = my_list[j:]
+```
+
+然而，更好的方式使用下面的操作，大家可以认真想想为什么。
+
+```Python
+del my_list[i:]
+del my_list[:j]
+```
+
+### 按最长列表实现zip操作
+
+Python的内置函数`zip`可以产生一个生成器对象，该生成器对象将两个或多个可迭代对象的元素组装到一起，如下所示。
+
+```Python
+list(zip('abc', [1, 2, 3, 4]))
+```
+
+执行上面的代码会得到一个如下所示的列表，相信大家也注意到了，列表中元素的个数是由`zip`函数中长度最小的可迭代对象决定的，所以下面的列表中只有3个元素。
+
+```Python
+[('a', 1), ('b', 2), ('c', 3)]
+```
+
+如果希望由`zip`函数中长度最大的可迭代对象来决定最终迭代出的元素个数，可以试一试`itertools`模块的`zip_longest`函数，其用法如下所示。
+
+```Python
+from itertools import zip_longest
+
+list(zip_longest('abc', [1, 2, 3, 4]))
+```
+
+上面的代码创建出的列表对象如下所示。
+
+```Python
+[('a', 1), ('b', 2), ('c', 3), (None, 4)]
+```
+
+### 快速拷贝一个列表
+
+如果希望快速拷贝一个列表对象，可以通过切片操作来实现，但是切片操作仅实现了浅拷贝，简单的说就是切片创建了新的列表对象，但是新列表中的元素是和之前的列表共享的。如果希望实现深拷贝，可以使用`copy`模块的`deepcopy`函数。
+
+- 浅拷贝
+
+    ```Python
+    thy_list = my_list[:]
+    ```
+
+    或
+
+    ```Python
+    import copy
+    
+    thy_list = copy.copy(my_list)
+    ```
+
+- 深拷贝
+
+    ```Python
+    import copy
+    
+    thy_list = copy.deepcopy(my_list)
+    ```
+
+### 对两个或多个列表对应元素进行操作
+
+Python内置函数中的`map`函数可以对一个可迭代对象中的元素进行“映射”操作，这个函数在批量处理数据时非常有用。但是很多人都不知道，这个函数还可以作用于多个可迭代对象，通过传入的函数对多个可迭代对象中的对应元素进行处理，如下所示。
+
+```Python
+my_list = [11, 13, 15, 17]
+thy_list = [2, 4, 6, 8, 10]
+list(map(lambda x, y: x + y, my_list, thy_list))
+```
+
+上面的操作会得到如下所示的列表。
+
+```Python
+[13, 17, 21, 25]
+```
+
+当然，同样的操作也可以用`zip`函数配合列表生成式来完成。
+
+```Python
+my_list = [11, 13, 15, 17]
+thy_list = [2, 4, 6, 8, 10]
+[x + y for x, y in zip(my_list, thy_list)]
+```
+
+### 处理列表中的空值和零值
+
+假设列表对象对应的变量名为`my_list`，如果列表中有空值（`None`）和零值，我们可以用下面的方式去掉空值和零值。
+
+```Python
+list(filter(bool, my_list))
+```
+
+对应的列表生成式语法如下所示。
+
+```Python
+[x for x in my_list if x]
+```
+
+### 从嵌套列表中抽取指定列
+
+假设`my_list`是一个如下所示的嵌套列表，该嵌套列表可以用来表示数学上的矩阵，如果要取出矩阵第一列的元素构成一个列表，我们可以这样写。
+
+```Python
+my_list = [
+    [1, 1, 2, 2],
+    [5, 6, 7, 8],
+    [3, 3, 4, 4],
+]
+col1, *_ = zip(*my_list)
+list(col1)
+```
+
+这里我们会得到一个如下所示的列表，刚好是矩阵的第一列。
+
+```Python
+[1, 5, 3]
+```
+
+以此类推，如果想取出矩阵第二列的元素构成一个列表，可以用如下所示的方法。
+
+```Python
+_, col2, *_ = zip(*my_list)
+list(col2)
+```
+
+至此，如果要实现矩阵的转置操作，我们也可以按照上面的思路写出下面的代码。
+
+```Python
+[list(x) for x in zip(*my_list)]
+```
+
+经过上面的操作，我们会得到如下所示的列表。
+
+```Python
+[[1, 5, 3], 
+ [1, 6, 3], 
+ [2, 7, 4], 
+ [2, 8, 4]]
+```
+
+### 小结
+
+不知道上面的内容有没有触及到大家的知识盲区，如果有的话欢迎在评论区留言讨论。
+
+  
\ No newline at end of file
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