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