From fee004e5c8db54237008545fc8f2e25a0ed28a04 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sat, 14 Aug 2021 10:48:03 +0800
Subject: [PATCH 01/26] Create 11.md

---
 md/11.md | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/md/11.md b/md/11.md
index 40874b42..31072399 100644
--- a/md/11.md
+++ b/md/11.md
@@ -9,9 +9,12 @@
 base为底的exp次幂，如果mod给出，取余
 
 ```python
-In [1]: pow(3, 2, 4)
+In [1]: pow(2,1.5)                                                              
+Out[1]: 2.8284271247461903
+
+In [1]: pow(3, 2, 4) # 3的2次方结果再对4取余数
 Out[1]: 1
 ```
 
 
-<center>[上一个例子](10.md)    [下一个例子](12.md)</center>
\ No newline at end of file
+<center>[上一个例子](10.md)    [下一个例子](12.md)</center>

From b6fa084758d309e3ce6bad7d70adc06ff57371a3 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sat, 14 Aug 2021 10:49:07 +0800
Subject: [PATCH 02/26] Update 10.md

---
 md/10.md | 35 +++++++++++++++++++++++++++++++----
 1 file changed, 31 insertions(+), 4 deletions(-)

diff --git a/md/10.md b/md/10.md
index b8ca63b2..1fdec254 100644
--- a/md/10.md
+++ b/md/10.md
@@ -6,12 +6,39 @@
 
 #### 10  转为整型　　
 
-int(x, base =10) , x可能为字符串或数值，将 x 转换为一个普通整数。如果参数是字符串，那么它可能包含符号和小数点。 
+int(x, base =10) , x可能为字符串或数值，将 x 转换为一个普通整数。
+
+参数base指定x进制数，常见的2，8，10，16分别表示二进制、八进制、十进制、十六进制的数字
+
+如果参数是字符串，必须为整数型字符串，如果是浮点数字符串会抛出异常。
+
+如果x是浮点数，int后截去小数点，只保留整数部分。
 
 ```python
-In [1]: int('12',16)
-Out[1]: 18
+In [2]: int('0110',2)
+
+Out[2]: 6
+
+In [3]: int('0732',8)
+Out[3]: 474
+
+In [4]: int('12',16)
+Out[4]: 18
+
+In [5]: int('12',10)
+Out[5]: 12
+
+In [6]: int(1.45)
+Out[6]: 1
+
+In [7]: int('1.45')
+---------------------------------------------------------------------------
+ValueError                                Traceback (most recent call last)
+<ipython-input-7-6cf4b951408f> in <module>
+----> 1 int('1.45')
+
+ValueError: invalid literal for int() with base 10: '1.45'
 ```
 
 
-<center>[上一个例子](9.md)    [下一个例子](11.md)</center>
\ No newline at end of file
+<center>[上一个例子](9.md)    [下一个例子](11.md)</center>

From fe458cd48b1d7170b824f13c334aff24952a64fc Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 15 Aug 2021 09:32:21 +0800
Subject: [PATCH 03/26] Update 13.md

---
 md/13.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/md/13.md b/md/13.md
index 634ac883..3cc2f3c5 100644
--- a/md/13.md
+++ b/md/13.md
@@ -6,6 +6,8 @@
 
 #### 13 链式比较
 
+Python支持这种连续不等比较，写起来更方便
+
 ```python
 i = 3
 print(1 < i < 3)  # False
@@ -13,4 +15,4 @@ print(1 < i <= 3)  # True
 ```
 
 
-<center>[上一个例子](12.md)    [下一个例子](14.md)</center>
\ No newline at end of file
+<center>[上一个例子](12.md)    [下一个例子](14.md)</center>

From 0a3c263dd8e13ab9e48acb0e802a4983330942d4 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 15 Aug 2021 09:45:32 +0800
Subject: [PATCH 04/26] Update 14.md

---
 md/14.md | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/md/14.md b/md/14.md
index a66f7aca..061a1d8d 100644
--- a/md/14.md
+++ b/md/14.md
@@ -11,9 +11,20 @@
 ```python
 In [12]: s = "apple"                                                            
 
-In [13]: bytes(s,encoding='utf-8')                                              
-Out[13]: b'apple'
+In [13]: a = bytes(s,encoding='utf-8')   
+In [14] a 
+Out[14]: b'apple'
+
+# 转化后a变为字节序列，bytes类型，
+# 并且每个字符都被转化为数值，如下所示
+In [15]: for i in a: 
+    ...:     print(i)                                                                       
+97
+112
+112
+108
+101
 ```
 
 
-<center>[上一个例子](13.md)    [下一个例子](15.md)</center>
\ No newline at end of file
+<center>[上一个例子](13.md)    [下一个例子](15.md)</center>

From da38cba034d783b4249435db9adc0fcbd47606c1 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Thu, 19 Aug 2021 08:32:00 +0800
Subject: [PATCH 05/26] Create 15.md

---
 md/15.md | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/md/15.md b/md/15.md
index 60fdbe93..b5127301 100644
--- a/md/15.md
+++ b/md/15.md
@@ -7,16 +7,30 @@
 #### 15 任意对象转为字符串　　
 
 ```python
-In [1]: i = 100                                                                
+                                                              
 
-In [2]: str(i)                                                                 
-Out[2]: '100'
+In [1]: str(100)                                                                 
+Out[1]: '100'
 
-In [3]: str([])                                                                
-Out[3]: '[]'
+In [2]: str([3,2,10])                                                           
+Out[2]: '[3, 2, 10]'
+
+In [3]: str({'a':1, 'b':10})                                                    
+Out[3]: "{'a': 1, 'b': 10}"
+
+In [11]: from collections import defaultdict                                    
+In [12]: dd = defaultdict(int)                                                  
+
+In [14]: for i in [1,3,2,2,3,3]: 
+    ...:     dd[i] += 1 
+    ...:                                                                        
+
+In [15]: dd                                                                     
+Out[15]: defaultdict(int, {1: 1, 3: 3, 2: 2})
+
+In [16]: str(dd)                                                                
+Out[16]: "defaultdict(<class 'int'>, {1: 1, 3: 3, 2: 2})"
 
-In [4]: str(tuple())                                                           
-Out[4]: '()'
 ```
 
-<center>[上一个例子](14.md)    [下一个例子](16.md)</center>
\ No newline at end of file
+<center>[上一个例子](14.md)    [下一个例子](16.md)</center>

From 941d93958ef30de6effaa8b21e49fcd23eee42a6 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 22 Aug 2021 09:58:10 +0800
Subject: [PATCH 06/26] Update 16.md

---
 md/16.md | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/md/16.md b/md/16.md
index 45bccd41..e8d661fa 100644
--- a/md/16.md
+++ b/md/16.md
@@ -18,6 +18,16 @@ Out[3]: <code object <module> at 0x0000000005DE75D0, file "<string>", line 1>
     
 In [4]: exec(r)
 helloworld
+
+s  = """
+def f():
+    print("hello world")
+    a = 100 % 52
+    print(a)
+f()
+"""
+r = compile(s,"<string>", "exec")
+exec(r)
 ```
 
-<center>[上一个例子](15.md)    [下一个例子](17.md)</center>
\ No newline at end of file
+<center>[上一个例子](15.md)    [下一个例子](17.md)</center>

From bb54be45648a9d227449862d0b8e9c5de77d0db8 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 22 Aug 2021 09:58:40 +0800
Subject: [PATCH 07/26] Update 16.md

---
 md/16.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/md/16.md b/md/16.md
index e8d661fa..5cc1a5a3 100644
--- a/md/16.md
+++ b/md/16.md
@@ -21,7 +21,6 @@ helloworld
 
 s  = """
 def f():
-    print("hello world")
     a = 100 % 52
     print(a)
 f()
@@ -30,4 +29,7 @@ r = compile(s,"<string>", "exec")
 exec(r)
 ```
 
+输出
+48
+
 <center>[上一个例子](15.md)    [下一个例子](17.md)</center>

From c86001fbed15e40b885933cdaf0c06076c31b2e0 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 22 Aug 2021 11:44:02 +0800
Subject: [PATCH 08/26] Update 17.md

---
 md/17.md | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/md/17.md b/md/17.md
index e09883c3..3b3c360c 100644
--- a/md/17.md
+++ b/md/17.md
@@ -13,6 +13,21 @@ In [1]: s = "1 + 3 +5"
 
 In [2]: eval(s)
 Out[2]: 9
+
+s = ["{'小汽车':10, '面包车':8}", "{'面包车':5}"]
+from collections import defaultdict
+d = defaultdict(int)
+
+for item in s:
+    my_dict = eval(item)
+    print(type(my_dict))
+    for key in my_dict:
+        d[key] += my_dict[key]
+print(d)
+
+<class 'dict'>
+<class 'dict'>
+defaultdict(<class 'int'>, {'小汽车': 10, '面包车': 13})
 ```
 
-<center>[上一个例子](16.md)    [下一个例子](18.md)</center>
\ No newline at end of file
+<center>[上一个例子](16.md)    [下一个例子](18.md)</center>

From 8114f5a963e1b1d9cb8fc535566ff5b95ce39051 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Wed, 25 Aug 2021 09:34:57 +0800
Subject: [PATCH 09/26] Update 23.md

---
 md/23.md | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/md/23.md b/md/23.md
index 05fb188b..ac994a9e 100644
--- a/md/23.md
+++ b/md/23.md
@@ -6,6 +6,30 @@
 
 #### 23 交换两元素
 
+理解交换两个元素，需要首先明白什么是pack，什么是unpack
+
+```python
+In [1]: a=[3,1]                                                                 
+
+# unpack
+In [2]: a0,a1 = a                                                               
+
+In [3]: a0                                                                      
+Out[3]: 3
+
+In [4]: a1                                                                      
+Out[4]: 1
+
+# pack
+In [5]: b = a0, a1                                                              
+
+In [6]: b                                                                       
+Out[6]: (3, 1)
+
+```
+
+所以下面 `b,a = a,b` 交换2个元素的过程，实际是先pack a,b为元组 (a,b)，然后再unpack (a,b) 给 b, a的过程
+
 ```python
 def swap(a, b):
     return b, a
@@ -14,4 +38,4 @@ def swap(a, b):
 print(swap(1, 0))  # (0,1)
 ```
 
-<center>[上一个例子](22.md)    [下一个例子](24.md)</center>
\ No newline at end of file
+<center>[上一个例子](22.md)    [下一个例子](24.md)</center>

From cd36035591a2432c2159a1819a1db4e9c695381f Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Fri, 27 Aug 2021 09:01:08 +0800
Subject: [PATCH 10/26] Update 29.md

---
 md/29.md | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/md/29.md b/md/29.md
index a2282893..9998a648 100644
--- a/md/29.md
+++ b/md/29.md
@@ -9,17 +9,24 @@
 创建数据字典
 
 ```python
+# 方法1：使用dict
 In [1]: dict()
 Out[1]: {}
-
 In [2]: dict(a='a',b='b')
 Out[2]: {'a': 'a', 'b': 'b'}
 
+# 方法2：zip
 In [3]: dict(zip(['a','b'],[1,2]))
 Out[3]: {'a': 1, 'b': 2}
 
+# 方法3：嵌入元组的列表
 In [4]: dict([('a',1),('b',2)])
 Out[4]: {'a': 1, 'b': 2}
+
+# 方法4：自典型字符串
+In [1]: s = "{'a':1, 'b':2}"                                                    
+In [2]: eval(s)                                                                 
+Out[2]: {'a': 1, 'b': 2}
 ```
 
-<center>[上一个例子](28.md)    [下一个例子](30.md)</center>
\ No newline at end of file
+<center>[上一个例子](28.md)    [下一个例子](30.md)</center>

From 851770759eafaec95076a19e37c27dd3f3786397 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Tue, 31 Aug 2021 22:55:36 +0800
Subject: [PATCH 11/26] Update 31.md

---
 md/31.md | 35 +++++++++++++++++++++++++++++++----
 1 file changed, 31 insertions(+), 4 deletions(-)

diff --git a/md/31.md b/md/31.md
index f2417ab3..c9a73545 100644
--- a/md/31.md
+++ b/md/31.md
@@ -9,10 +9,37 @@
 返回一个set对象，集合内不允许有重复元素：
 
 ```python
-In [159]: a = [1,4,2,3,1]
+In [1]: a = [1,4,2,3,1]
 
-In [160]: set(a)
-Out[160]: {1, 2, 3, 4}
+In [2]: set(a)
+Out[2]: {1, 2, 3, 4}
+
+In [3]: b = set(a)
+
+In [4]: b.add(5)
+
+In [5]: b
+Out[5]: {1, 2, 3, 4, 5}
+
+In [6]: b.pop()
+Out[6]: 1
+
+In [7]: b
+Out[7]: {2, 3, 4, 5}
+
+In [8]: b.pop()
+Out[8]: 2
+
+In [9]: b
+Out[9]: {3, 4, 5}
+
+# 注意pop删除集合内任意一个元素
+In [10]: help(b.pop)
+Help on built-in function pop:
+
+pop(...) method of builtins.set instance
+    Remove and return an arbitrary set element.
+    Raises KeyError if the set is empty.
 ```
 
-<center>[上一个例子](30.md)    [下一个例子](32.md)</center>
\ No newline at end of file
+<center>[上一个例子](30.md)    [下一个例子](32.md)</center>

From 9e7117cf9ab1be17b4ea85772a6d0c1b2792e942 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 5 Sep 2021 11:23:36 +0800
Subject: [PATCH 12/26] Update 48.md

---
 md/48.md | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/md/48.md b/md/48.md
index 38073257..c62565fc 100644
--- a/md/48.md
+++ b/md/48.md
@@ -5,14 +5,22 @@
 ```
 
 #### 48 查看变量所占字节数
+`getsizeof`查看变量占用字节数
+看到：字典比列表占用更多空间
 
 ```python
 In [1]: import sys
 
-In [2]: a = {'a':1,'b':2.0}
+In [3]: a = [('a',1),('b',2)]                                                                                                             
+
+In [5]: sys.getsizeof(a)                                                        
+Out[5]: 88
+
+
+In [6]: a = {'a':1,'b':2.0}                                                     
+In [7]: sys.getsizeof(a)                                                        
+Out[7]: 248
 
-In [3]: sys.getsizeof(a) # 占用240个字节
-Out[3]: 240
 ```
 
-<center>[上一个例子](47.md)    [下一个例子](49.md)</center>
\ No newline at end of file
+<center>[上一个例子](47.md)    [下一个例子](49.md)</center>

From efa3de2b182f2b74189bf6ca3a5cf0f70b8376be Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 3 Oct 2021 20:09:25 +0800
Subject: [PATCH 13/26] Update 9.md

---
 md/9.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/md/9.md b/md/9.md
index 982caa4d..ad0d55f7 100644
--- a/md/9.md
+++ b/md/9.md
@@ -17,6 +17,11 @@ In [1]: float('3')
 Out[1]: 3.0
 ```
 
+```python
+float('inf') # 正无穷大
+float('-inf') # 负无穷大
+```
+
 如果不能转化为浮点数，则会报`ValueError`:
 
 ```python

From 816cda665ac0f4bff3ed960275ee0786ab988c98 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 3 Oct 2021 20:09:57 +0800
Subject: [PATCH 14/26] Update 9.md

---
 md/9.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/md/9.md b/md/9.md
index ad0d55f7..7864b486 100644
--- a/md/9.md
+++ b/md/9.md
@@ -17,6 +17,7 @@ In [1]: float('3')
 Out[1]: 3.0
 ```
 
+正无穷大、负无穷大
 ```python
 float('inf') # 正无穷大
 float('-inf') # 负无穷大

From 2516dc4cd478e8d5d518bfeb53e7fd341c141e32 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 3 Oct 2021 20:11:28 +0800
Subject: [PATCH 15/26] Update 9.md

---
 md/9.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/md/9.md b/md/9.md
index 7864b486..2e69dd2a 100644
--- a/md/9.md
+++ b/md/9.md
@@ -17,6 +17,13 @@ In [1]: float('3')
 Out[1]: 3.0
 ```
 
+```python
+import sys
+
+In[4]: sys.float_info.max                                                      
+Out[4]: 1.7976931348623157e+308
+```
+
 正无穷大、负无穷大
 ```python
 float('inf') # 正无穷大

From 126d01f7b6aedd419affc152435256d696006fe8 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 3 Oct 2021 20:11:50 +0800
Subject: [PATCH 16/26] Update 9.md

---
 md/9.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/md/9.md b/md/9.md
index 2e69dd2a..3cd61f78 100644
--- a/md/9.md
+++ b/md/9.md
@@ -17,6 +17,7 @@ In [1]: float('3')
 Out[1]: 3.0
 ```
 
+浮点数最大值
 ```python
 import sys
 

From 3357afd664cf9f15a84fed9cc6b24b052303df69 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Tue, 14 Dec 2021 08:02:26 +0800
Subject: [PATCH 17/26] Update README.md

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 7e9513f0..6028c228 100644
--- a/README.md
+++ b/README.md
@@ -98,7 +98,7 @@ Python小例子 https://github.com/jackzhenguo/python-small-examples
 | 24 | [使用堆升序列表](md/196.md) | sort heapq | v1.0 | ⭐️⭐⭐⭐ |
 
 
-### 面向对象OOP
+### 面向对象
 | 小例子 | 链接                    | 标签              | 版本          | 难度 |
 | ---- | ---------------------------------- | ---- | ---- | ---- |
 | 1   | [所有对象之根](md/43.md)           | object     | V1.0       | ⭐️ |
@@ -240,7 +240,7 @@ Python小例子 https://github.com/jackzhenguo/python-small-examples
 | 37 | [一行代码让 pip 安装加速 100 倍](md/176.md) | pip install | v1.0 | ⭐️⭐⭐ |
 
 
-### 案例
+### 工作常用案例
 | 小例子 | 链接                    | 标签              | 版本          | 难度 |
 | ---- | ---------------------------------- | ---- | ---- | ---- |
 | 1   | [不用else和if实现计算器](md/60.md) | operator | V1.0 | ⭐️⭐️⭐️ |

From 6cd22b007965fda8d089fd606c888b6d9a68671f Mon Sep 17 00:00:00 2001
From: guozhen3 <guozhen3@jd.com>
Date: Fri, 31 Dec 2021 14:13:11 +0800
Subject: [PATCH 18/26] =?UTF-8?q?2021=E7=9B=98=E7=82=B9?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 md/1.md |  2 +-
 md/2.md | 16 ++++++++--------
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/md/1.md b/md/1.md
index f135deea..817a25ea 100644
--- a/md/1.md
+++ b/md/1.md
@@ -4,7 +4,7 @@
 @date 2019/2/10
 ```
 
-#### 2 实现 relu
+#### 1 实现 relu
 
 在神经网络中，`relu`作为神经元的激活函数：
 
diff --git a/md/2.md b/md/2.md
index 22a5a27f..aa58feaa 100644
--- a/md/2.md
+++ b/md/2.md
@@ -8,21 +8,21 @@
 
 十进制转换为二进制：
 ```python
-In [2]: bin(10)                                                                 
-Out[2]: '0b1010'
+In [1]: bin(10)                                                                 
+Out[1]: '0b1010'
 ```
 
 十进制转换为八进制：
 ```python
-In [3]: oct(9)                                                                  
-Out[3]: '0o11'
+In [2]: oct(9)                                                                  
+Out[2]: '0o11'
 ```
 
 十进制转换为十六进制：
 ```python
-In [4]: hex(15)                                                                 
-Out[4]: '0xf'
+In [3]: hex(15)                                                                 
+Out[3]: '0xf'
 ```
-
-
+
+
 <center>[上一个例子](1.md)    [下一个例子](3.md)</center>
\ No newline at end of file

From 67984acfda1294709aeff3ce1183769b59c05465 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=83=AD=E9=A3=9E?= <me@guofei.site>
Date: Wed, 23 Mar 2022 15:26:01 +0800
Subject: [PATCH 19/26] typo

---
 md/159.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/md/159.md b/md/159.md
index 84bec8a9..98b7426f 100644
--- a/md/159.md
+++ b/md/159.md
@@ -13,7 +13,7 @@
 
 ```python
 def del_item(lst,e):
-    return [lst.remove(i) for i in e if i==e] # NO!
+    return [lst.remove(i) for i in lst if i==e] # NO!
 ```
 
 考虑删除这个序列[1,3,3,3,5]中的元素3，结果发现只删除其中两个：
@@ -31,4 +31,4 @@ def del_item(lst,e):
 
 ```  
 
-<center>[上一个例子](158.md)    [下一个例子](160.md)</center>
\ No newline at end of file
+<center>[上一个例子](158.md)    [下一个例子](160.md)</center>

From e8e698d82fba012829a99ac40ff7c590726cbdb0 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Fri, 9 Sep 2022 09:06:53 -0500
Subject: [PATCH 20/26] Update 118.md

---
 md/118.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/md/118.md b/md/118.md
index ca14fe8d..8b3eaec1 100644
--- a/md/118.md
+++ b/md/118.md
@@ -23,7 +23,7 @@ print(t) # <_MainThread(MainThread, started 139908235814720)>
 
 所以，验证了程序默认是在`MainThead`中执行。
 
-`t.getName()`获得这个线程的名字，其他常用方法，`getName()`获得线程`id`,`isAlive()`判断线程是否存活等。
+`t.getName()`获得这个线程的名字，其他常用方法，`t.ident`获得线程`id`,`isAlive()`判断线程是否存活等。
 
 ```python
 print(t.getName()) # MainThread
@@ -31,4 +31,4 @@ print(t.ident) # 139908235814720
 print(t.isAlive()) # True
 ```
 
-<center>[上一个例子](117.md)    [下一个例子](119.md)</center>
\ No newline at end of file
+<center>[上一个例子](117.md)    [下一个例子](119.md)</center>

From 4e58d55dcec9ab1b5c0e6f8d883bb9a1bf8a4fe9 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Fri, 9 Sep 2022 09:41:27 -0500
Subject: [PATCH 21/26] Update 123.md

---
 md/123.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/md/123.md b/md/123.md
index 20f70c47..ccff06f5 100644
--- a/md/123.md
+++ b/md/123.md
@@ -54,10 +54,10 @@ t8  adds a to 1: 9
 t9  adds a to 1: 10
 ```
 
-一起正常，其实这已经是单线程顺序执行了，就本例子而言，已经失去多线程的价值，并且还带来了因为线程创建开销，浪费时间的副作用。
+一切正常，其实这已经是单线程顺序执行了，就本例子而言，已经失去多线程的价值，并且还带来了因为线程创建开销，浪费时间的副作用。
 
 程序中只有一把锁，通过 `try...finally`还能确保不发生死锁。但是，当程序中启用多把锁，还是很容易发生死锁。
 
 注意使用场合，避免死锁，是我们在使用多线程开发时需要注意的一些问题。
 
-<center>[上一个例子](122.md)    [下一个例子](124.md)</center>
\ No newline at end of file
+<center>[上一个例子](122.md)    [下一个例子](124.md)</center>

From 7df363d6020d929d8346446388e4eb8ec7140fec Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 11 Jun 2023 19:33:10 -0500
Subject: [PATCH 22/26] Add files via upload

---
 script/avatar.png | Bin 0 -> 3357 bytes
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 script/avatar.png

diff --git a/script/avatar.png b/script/avatar.png
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From b5ffe027c4202496eef4a1903d7336b29a0f2074 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 3 Sep 2023 18:56:49 -0500
Subject: [PATCH 23/26] Update README.md

---
 README.md | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/README.md b/README.md
index 6028c228..327b5186 100644
--- a/README.md
+++ b/README.md
@@ -17,10 +17,6 @@
 
 告别枯燥，告别枯燥，致力于打造 Python 经典小例子、小案例。 
 
-同时托管在[Python中文网](http://www.zglg.work/python-small-examples/)
-
-使用Python制作的各种小工具：[Python实用小工具](http://www.zglg.work:5000/pytools)
-
 ## License
 
 允许按照要求转载，但禁止用于任何商用目的。如果转载本库小例子、小案例，请备注下方链接：

From f6c6f1179e85ff53d583fde1e9ab7253bda373f2 Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Sun, 3 Sep 2023 18:57:38 -0500
Subject: [PATCH 24/26] Update README.md

---
 README.md | 104 ------------------------------------------------------
 1 file changed, 104 deletions(-)

diff --git a/README.md b/README.md
index 327b5186..8e1e9cda 100644
--- a/README.md
+++ b/README.md
@@ -269,107 +269,3 @@ Python小例子 https://github.com/jackzhenguo/python-small-examples
 | 28 | [求两点球面距离](md/199.md) | math asin | V1.0 | ⭐️⭐️⭐️⭐️⭐️ |
 | 29 | [获取文件编码](md/200.md) | chardet | V1.0 | ⭐️⭐️⭐️⭐️⭐️ |
 | 30 | [格式化json串](md/201.md) | json | V1.0 | ⭐️⭐️⭐️⭐️⭐️ |
-
-
-
-## Python原创教程
-这是经过很久打磨的一个Python教程，全部是个人原创，已首发在公众号，并且托管在我的[个人网站](http://www.zglg.work/python-level/)。
-
-想系统入门Python的欢迎学习：
-
-[Python进阶完整教程](http://www.zglg.work/python-level/)
-
-[Python前言](http://www.zglg.work/Python-20-topics/intro-python/)
-
-[Google Python代码风格指南](http://www.zglg.work/Python-20-topics/google-python-coding-style/)
-
-Python关于数字的20个操作
-
-[Python数字](http://www.zglg.work/Python-20-topics/python-number/)
-
-[Python正则之提取正整数和大于0浮点数](http://www.zglg.work/python-level/python-re-integer-float.md)
-
-[Python字符串](http://www.zglg.work/Python-20-topics/python-string/)
-
-[CSV读写乱码问题](http://www.zglg.work/Python-20-topics/csv-rw-coding-issue/)
-
-[Unicode标准化](http://www.zglg.work/Python-20-topics/unicode-standard/)
-
-[Unicode, UTF-8, ASCII](http://www.zglg.work/Python-20-topics/unicode-utf-8/)
-
-[Python动态生成变量](http://www.zglg.work/Python-20-topics/dynamic_variable/)
-
-[Python字符串对齐](http://www.zglg.work/Python-20-topics/python-string-align/)
-
-[Python小项目1：文本句子关键词的KWIC显示](http://www.zglg.work/Python-20-topics/python-project1-kwic/)
-
-[Python列表](http://www.zglg.work/Python-20-topics/python-list/)
-
-[Python流程控制](http://www.zglg.work/Python-20-topics/python-control/)
-
-[Python编程习惯专题](http://www.zglg.work/Python-20-topics/python-program-habit/)
-
-[Python函数专题](http://www.zglg.work/Python-20-topics/python-functions/)
-
-[Python面向对象编程-上篇](http://www.zglg.work/Python-20-topics/python-oop-1/)
-
-[Python面向对象编程-下篇](http://www.zglg.work/Python-20-topics/python-oop-2/)
-
-[Python十大数据结构使用专题](http://www.zglg.work/Python-20-topics/python-data-structure/)
-
-[Python包和模块使用注意事项专题](http://www.zglg.work/Python-20-topics/python-package-module-apply-items/)
-
-[Python正则使用专题](http://www.zglg.work/Python-20-topics/python-re-apply/)
-
-[Python时间专题](http://www.zglg.work/Python-20-topics/python-time/)
-
-[Python装饰器专题](http://www.zglg.work/Python-20-topics/python-decorator-apply/)
-
-[Python迭代器使用专题](http://www.zglg.work/Python-20-topics/python-iterator-apply/)
-
-[Python生成器使用专题](http://www.zglg.work/Python-20-topics/python-generator-apply/)
-
-[Python 绘图入门专题](http://www.zglg.work/Python-20-topics/python-graph-intro/)
-
-[Matplotlib绘图基础专题](http://www.zglg.work/Python-20-topics/python-matplotlib-1/)
-
-[Matplotlib绘图进阶专题](http://www.zglg.work/Python-20-topics/python-matplotlib-2/)
-
-[Matplotlib绘图案例](http://www.zglg.work/Python-20-topics/python-matplotlib-examples/)
-
-[NumPy图解入门](http://www.zglg.work/Python-20-topics/numpy-graph-intro/)
-
-
-## NumPy入门教程
-
-1 [NumPy介绍](http://www.zglg.work/numpy-intro/)
-
-2 [安装和导入NumPy](http://www.zglg.work/numpy/numpy-install/)
-
-3 [Python列表和NumPy数组有什么区别？](http://www.zglg.work/numpy/numpy-array-different-python-list/)
-
-4 [什么是array?](http://www.zglg.work/numpy/what-is-numpy/)
-
-5 [有关Array的详细信息](http://www.zglg.work/numpy/numpy-array-more/)
-
-6 [如何创建array](http://www.zglg.work/numpy/numpy-create-array/)
-
-7 [添加、删除和排序元素](http://www.zglg.work/numpy/numpy-add-remove-sort/)
-
-8 [数组形状和大小](http://www.zglg.work/numpy/numpy-shape/)
-
-9 [重塑array](http://www.zglg.work/numpy/numpy-reshape/)
-
-10 [如何将一维array转换为二维array(如何向数组添加新轴)](http://www.zglg.work/numpy/numpy-1d-2d-more/)
-
-11 [NumPy索引和切片](http://www.zglg.work/numpy/numpy-indexing-slicing/)
-
-12 [如何从现有数据创建数组](http://www.zglg.work/numpy/numpy-create-an-array-from-existing-data/)
-
-13 [数组基本操作](http://www.zglg.work/numpy/numpy-basic-array-operations/)
-
-14 [广播](http://www.zglg.work/numpy/numpy-broadcasting/)
-
-15 [更有用的数组操作](http://www.zglg.work/numpy/numpy-more-array-operations/)
-
-16 [生成随机数](http://www.zglg.work/numpy/numpy-generate-random-number/)

From 4944885a61768bf9ac7dd7ec4c5bbf553675514e Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Wed, 26 Jun 2024 11:36:48 -0500
Subject: [PATCH 25/26] Update README.md

---
 README.md | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 8e1e9cda..a3e3868e 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@
 
 允许按照要求转载，但禁止用于任何商用目的。如果转载本库小例子、小案例，请备注下方链接：
 
-Python小例子 https://github.com/jackzhenguo/python-small-examples
+[Python小例子](https://ai-jupyter.com/python-small-examples/)
 
 ## Python 小例子
 
@@ -269,3 +269,32 @@ Python小例子 https://github.com/jackzhenguo/python-small-examples
 | 28 | [求两点球面距离](md/199.md) | math asin | V1.0 | ⭐️⭐️⭐️⭐️⭐️ |
 | 29 | [获取文件编码](md/200.md) | chardet | V1.0 | ⭐️⭐️⭐️⭐️⭐️ |
 | 30 | [格式化json串](md/201.md) | json | V1.0 | ⭐️⭐️⭐️⭐️⭐️ |
+
+### 更多教程
+
+[AI消息](https://ai-jupyter.com/)
+
+[AI新闻报道](https://ai-jupyter.com/ai-news-all/)
+
+[AI大模型](https://ai-jupyter.com/ai-llm/)
+
+[AI工具集](https://ai-jupyter.com/ai-chatgpt/)
+
+[ChatGPT4o免费使用六种方法](https://ai-jupyter.com/ai-chatgpt/)
+
+[Python教程](https://ai-jupyter.com/python-packages/)
+
+[数据分析教程](https://ai-jupyter.com/numpy-intro/)
+
+[算法教程](https://ai-jupyter.com/algorithm-basic/)
+
+[AI教程](https://ai-jupyter.com/statistics/)
+
+[Git教程](https://ai-jupyter.com/git/)
+
+[程序员](https://ai-jupyter.com/others/)
+
+[资料下载](https://ai-jupyter.com/python-20/)
+
+
+

From aa11da6ac252f13bda7eaff976ca06446c70ef6d Mon Sep 17 00:00:00 2001
From: jackzhenguo <guozhennianhua@163.com>
Date: Wed, 26 Jun 2024 11:37:35 -0500
Subject: [PATCH 26/26] Update README.md

---
 README.md | 54 ++++++++++++++++++++++++++++--------------------------
 1 file changed, 28 insertions(+), 26 deletions(-)

diff --git a/README.md b/README.md
index a3e3868e..91ab7d1f 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,34 @@
 
 允许按照要求转载，但禁止用于任何商用目的。如果转载本库小例子、小案例，请备注下方链接：
 
-[Python小例子](https://ai-jupyter.com/python-small-examples/)
+[Python小例子所有汇总](https://ai-jupyter.com/python-small-examples/)
+
+### 更多教程
+
+[AI消息](https://ai-jupyter.com/)
+
+[AI新闻报道](https://ai-jupyter.com/ai-news-all/)
+
+[AI大模型](https://ai-jupyter.com/ai-llm/)
+
+[AI工具集](https://ai-jupyter.com/ai-chatgpt/)
+
+[ChatGPT4o免费使用六种方法](https://ai-jupyter.com/ai-chatgpt/)
+
+[Python教程](https://ai-jupyter.com/python-packages/)
+
+[数据分析教程](https://ai-jupyter.com/numpy-intro/)
+
+[算法教程](https://ai-jupyter.com/algorithm-basic/)
+
+[AI教程](https://ai-jupyter.com/statistics/)
+
+[Git教程](https://ai-jupyter.com/git/)
+
+[程序员](https://ai-jupyter.com/others/)
+
+[资料下载](https://ai-jupyter.com/python-20/)
+
 
 ## Python 小例子
 
@@ -270,31 +297,6 @@
 | 29 | [获取文件编码](md/200.md) | chardet | V1.0 | ⭐️⭐️⭐️⭐️⭐️ |
 | 30 | [格式化json串](md/201.md) | json | V1.0 | ⭐️⭐️⭐️⭐️⭐️ |
 
-### 更多教程
-
-[AI消息](https://ai-jupyter.com/)
-
-[AI新闻报道](https://ai-jupyter.com/ai-news-all/)
-
-[AI大模型](https://ai-jupyter.com/ai-llm/)
-
-[AI工具集](https://ai-jupyter.com/ai-chatgpt/)
-
-[ChatGPT4o免费使用六种方法](https://ai-jupyter.com/ai-chatgpt/)
-
-[Python教程](https://ai-jupyter.com/python-packages/)
-
-[数据分析教程](https://ai-jupyter.com/numpy-intro/)
-
-[算法教程](https://ai-jupyter.com/algorithm-basic/)
-
-[AI教程](https://ai-jupyter.com/statistics/)
-
-[Git教程](https://ai-jupyter.com/git/)
-
-[程序员](https://ai-jupyter.com/others/)
-
-[资料下载](https://ai-jupyter.com/python-20/)