7.9小节完成~

cookbook/c07/p09_class_to_func.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+# -*- encoding: utf-8 -*-
+"""
+Topic: 单方法类转换为函数
+Desc : 
+"""
+
+from urllib.request import urlopen
+
+
+class UrlTemplate:
+    def __init__(self, template):
+        self.template = template
+
+    def open(self, **kwargs):
+        return urlopen(self.template.format_map(kwargs))
+
+# Example use. Download stock data from yahoo
+yahoo = UrlTemplate('http://finance.yahoo.com/d/quotes.csv?s={names}&f={fields}')
+for line in yahoo.open(names='IBM,AAPL,FB', fields='sl1c1v'):
+    print(line.decode('utf-8'))
+
+
+# =======================闭包方案=================
+def urltemplate(template):
+    def opener(**kwargs):
+        return urlopen(template.format_map(kwargs))
+    return opener
+
+# Example use
+yahoo = urltemplate('http://finance.yahoo.com/d/quotes.csv?s={names}&f={fields}')
+for line in yahoo(names='IBM,AAPL,FB', fields='sl1c1v'):
+    print(line.decode('utf-8'))