如何解析HTML表格Python和beautifulsoup并写入到CSV

问题描述

我试图解析HTML页和货币获取价值观和写入CSV。
我有以下code：

I try to parse html page and fetch values for currencies and write to csv.I have following code:

#!/usr/bin/env python

import urllib2
from BeautifulSoup import BeautifulSoup

contenturl = "http://www.bank.gov.ua/control/en/curmetal/detail/currency?period=daily"
soup = BeautifulSoup(urllib2.urlopen(contenturl).read())

table = soup.find('div', attrs={'class': 'content'})

rows = table.findAll('tr')
for tr in rows:
    cols = tr.findAll('td')
    for td in cols:
        text = td.find(text=True) + ';'
        print text,
    print

问题是，我不知道，如何为货币只检索值。
我尝试了一些正则表达式，如^ [0-9] {3} - 开始与3位，但它不能正常工作

The problem is, that I do not know, how to retrieve only values for currency.I tried some regexp like '^[0-9]{3}' - start with 3 digits but it doesn't work.

推荐答案

您会好得多表中挑选出特定的细胞。在 D 与细胞cell_c 类包含数据您有兴趣，最后一个总是货币汇率

You'd be much better off picking out specific cells in the table. The td cells with the cell_c class contain data you are interested in, and the last one is always the currency exchange rate:

rows = table.findAll('tr')
for tr in rows:
    cols = tr.findAll('td')
    if 'cell_c' in cols[0]['class']:
        # currency row
        digital_code, letter_code, units, name, rate = [c.text for c in cols]
        print digital_code, letter_code, units, name, rate

随着独立变量的数据，现在可以把文本十进制数，将它们存储在数据库中，等等。

With the data in separate variables, you can now turn the text to decimal numbers, store them in a database, whatever.

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