add 07-function README 🙏

Author: muyuuuu

04-generator-and-iterator/iterator_visit.py

@@ -116,4 +116,3 @@ def flatten(items, ignore_types=(str, bytes)):
 items = ['Dave', 'Paula', ['Thomas', 'Lewis']]
 for x in flatten(items):
     print(x)
-

07-function/README.md

@@ -0,0 +1,2 @@
+1. `anonymous.py`：匿名函数
+2. `parameter.py`：传参的艺术

07-function/anonymous.py

@@ -10,6 +10,7 @@
 -----------
 @ 佛祖保佑，永无BUG--
 '''
+import math
 
 # 匿名函数
 # 冒号前是参数，冒号后是返回的结果
@@ -39,3 +40,15 @@
 b = lambda y, x=x: x + y
 print(a(10))
 print(b(10))
+
+# 多个数值的比较并排序
+center = (4.2, 6.7)
+points = [ (1, 2), (3, 4), (5, 6), (7, 8) ]
+
+def distance(p1, p2):
+    x1, y1 = p1
+    x2, y2 = p2
+    return math.hypot(x2 - x1, y2 - y1)
+
+points.sort(key=lambda p: distance(center, p))
+print(points)

07-function/parameter.py

@@ -92,4 +92,3 @@ def distance(p1, p2):
 print(points)
 # 等价
 points.sort(key=lambda p: distance(center, p))
-