liuyix · December 30, 2015 16:09 · Dec 11, 2013 · Dec 8, 2013 · Dec 8, 2013 · Dec 8, 2013
diff --git a/python-tips.md b/python-tips.md
@@ -21,4 +21,8 @@ class Foo(object):
 True
 ```
 
+### 排序——lambda匿名函数
 
+`result = sorted(memory_dict, key=lambda elem: elem[0]+elem[1], reverse=True)`
+
+link: http://docs.python.org/2/tutorial/controlflow.html#lambda-expressions
diff --git a/python-tips.md b/python-tips.md
@@ -17,7 +17,7 @@ class Foo(object):
 
 ```python
 >> mydict = {'foo': 'foo', 'bar': 'bar', 'hi':'hi'}
->> set(['foo', 'bar']) <= set(mydit)
+>> set(['foo', 'bar']) <= set(mydict)
 True
 ```
 

diff --git a/python-tips.md b/python-tips.md
@@ -15,7 +15,7 @@ class Foo(object):
 
 ### dict判断是否具有某些key
 
-```
+```python
 >> mydict = {'foo': 'foo', 'bar': 'bar', 'hi':'hi'}
 >> set(['foo', 'bar']) <= set(mydit)
 True

diff --git a/python-tips.md b/python-tips.md
@@ -13,4 +13,12 @@ class Foo(object):
 `pack_info = dict((key, p.__dict__[key]) for key in Package.json_members)`
 **实现字典的部分拷贝**
 
+### dict判断是否具有某些key
+
+```
+>> mydict = {'foo': 'foo', 'bar': 'bar', 'hi':'hi'}
+>> set(['foo', 'bar']) <= set(mydit)
+True
+```
+
 
diff --git a/python-tips.md b/python-tips.md
@@ -0,0 +1,16 @@
+## Python Tips
+
+### 建立class的最佳实践
+
+credit:http://stackoverflow.com/a/62680
+
+```python
+class Foo(object):
+    #...
+```
+
+这样的建立方式，可以是Foo类自带`__dict__`,其中包含了所有类成员的字典，因此可以使用下面的语句：
+`pack_info = dict((key, p.__dict__[key]) for key in Package.json_members)`
+**实现字典的部分拷贝**
+
+
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