【发布时间】：2019-06-23 05:50:26
【问题描述】：
以下代码检查新闻文本中是否存在公司名称（来自 tickerList）或其片段（来自 newsList ）。 如果在 news print 中找到该公司，则给出了该公司的预期股票代码，但是在将此新闻添加到列表后，就会发生一些废话:( 看起来，当将字典 (news) 附加到列表 (tickersNews) 时，列表的先前元素会被覆盖。为什么？
需要注意的是，当作为字典附加的新闻转换为字符串时，一切正常
import re
tickersList = [('ATI', 'Allegheny rporated', 'Allegheny Technologies Incorporated'), ('ATIS', 'Attis', 'Attis Industries, Inc.'), ('ATKR', 'Atkore International Group', 'Atkore International Group Inc.'), ('ATMP', 'Barclays + Select M', 'Barclays ETN+ Select MLP'), ('ATNM', 'Actinium', 'Actinium Pharmaceuticals, Inc.'), ('ATNX', 'Athenex', 'Athenex, Inc.'), ('ATOS', 'Atossa Genetics', 'Atossa Genetics Inc.'), ('ATRA', 'Atara Biotherapeutics', 'Atara Biotherapeutics, Inc.'), ('ATRC', 'AtriCure', 'AtriCure, Inc.'), ('ATRO', 'Astronics', 'Astronics Corporation'), ('ATRS', 'Antares Pharma', 'Antares Pharma, Inc.'), ('ATSG', 'Air Transport Services Group', 'Air Transport Services Group, Inc.'), ('CJ', 'C&J Energy', 'C&J Energy Services, Inc.'), ('CJJD', 'China Jo-Jo Drugstores', 'China Jo-Jo Drugstores, Inc.'), ('CLAR', 'Clarus', 'Clarus Corporation'), ('CLD', 'Cloud Peak Energy', 'Cloud Peak Energy Inc.'), ('CLDC', 'China Lending', 'China Lending Corporation'), ('CLDR', 'Cloudera', 'Cloudera, Inc.')]
newsList = [
{'title':'Atara Biotherapeutics Announces Planned Chief Executive Officer Transition'},
{'title':'Chongqing Jingdong Pharmaceutical and Athenex Announce a Strategic Partnership and Licensing Agreement to Develop and Commercialize KX2-391 in China'}
]
tickersNews = []
for news in newsList:
# pass through the list of companies looking for their mention in the news
for ticker, company, company_full in tickersList:
# clear the full name of the company from brackets, spaces, articles,
# points and commas and save fragments of the full name to the list
companyFullFragments = company_full.replace(',', '')\
.replace('.', '').replace('The ', ' ')\
.replace('(', ' ').replace(')', ' ')\
.replace(' ', ' ').strip().split()
# looking for a company in the news every time cutting off
# the last fragment from the full company name
for i in range(len(companyFullFragments), 0, -1):
companyFullFragmentsString = ' '.join(companyFullFragments[:i]).strip()
lookFor_company = r'(^|\s){0}(\s|$)'.format(companyFullFragmentsString)
results_company = re.findall(lookFor_company, news['title'])
# if the title of the news contains the name of the company,
# then we add the ticker, the found fragment and the full name
# of the company to the news, print the news and add it to the list
if results_company:
news['ticker'] = ticker#, companyFullFragmentsString, company_full
print(news['ticker'], 'found')
#tickersNews.append(str(news))
#-----------------------------Here is the problem!(?)
tickersNews.append(news)
# move on to the next company
break
print(20*'-', 'appended:')
for news in tickersNews:
print(news['ticker'])
输出（字典列表）：
ATRA found
ATNX found
CJJD found
CLDC found
-------------------- appended:
ATRA
CLDC
CLDC
CLDC
输出（字符串列表）：
ATRA found
ATNX found
CJJD found
CLDC found
-------------------- appended as a strings:
["{'title': 'Atara Biotherapeutics Announces Planned Chief Executive Officer Transition', 'ticker': 'ATRA'}", "{'title': 'Chongqing Jingdong Pharmaceutical and Athenex Announce a Strategic Partnership and Licensing Agreement to Develop and Commercialize KX2-391 in China', 'ticker': 'ATNX'}", "{'title': 'Chongqing Jingdong Pharmaceutical and Athenex Announce a Strategic Partnership and Licensing Agreement to Develop and Commercialize KX2-391 in China', 'ticker': 'CJJD'}", "{'title': 'Chongqing Jingdong Pharmaceutical and Athenex Announce a Strategic Partnership and Licensing Agreement to Develop and Commercialize KX2-391 in China', 'ticker': 'CLDC'}"]
【问题讨论】：
标签： python-3.x list dictionary append