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diff --git "a/Day16-20/16-20.Python\350\257\255\350\250\200\350\277\233\351\230\266.md" "b/Day16-20/16-20.Python\350\257\255\350\250\200\350\277\233\351\230\266.md"
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index f389505aa..4f1c60787
--- "a/Day16-20/16-20.Python\350\257\255\350\250\200\350\277\233\351\230\266.md"
+++ "b/Day16-20/16-20.Python\350\257\255\350\250\200\350\277\233\351\230\266.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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diff --git "a/Day31-35/31-35.\347\216\251\350\275\254Linux\346\223\215\344\275\234\347\263\273\347\273\237.md" "b/Day31-35/31-35.\347\216\251\350\275\254Linux\346\223\215\344\275\234\347\263\273\347\273\237.md"
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+++ "b/Day31-35/31-35.\347\216\251\350\275\254Linux\346\223\215\344\275\234\347\263\273\347\273\237.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。
-
+
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。
-
+
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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@@ -0,0 +1,228 @@
+## 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。
+
+
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