【问题标题】：How to add comma in between strings inside square brackets in pandas如何在熊猫方括号内的字符串之间添加逗号
【发布时间】：2018-08-16 10:55:55
【问题描述】：

我有一个熊猫数据框：-

categories
['business $ finance'\n 'business $currency']
['entertainment $movies' 'entertainment &music']
['sports& volleyball' 'sports& football'\n 'sports$ baseball']
...............

我只想将括号内的这些字符串转换为正确的列表格式。预期输出为：-

categories
['business $ finance','business $currency']
['entertainment $movies','entertainment &music']
['sports&volleyball','sports& football','sports$ baseball']
....................

到目前为止我所尝试的：-

array_cat=[]
for i in df['categories']:
      s=i[0].split()
      array_cat.append(s)

编辑

df['categories'][0] 类似于：-

"['business finance#mergers & acquisitions' 'business#industries#telecom'\n 'diseases#kidney' 'gaming #offline #console#xbox'\n 'gaming #offline #playstation' 'lifestyle#shopping' 'movies#genres#drama'\n 'music#genres#hiphop/rap' 'personal finance#tools' 'technology#trending'\n 'theme#historicalsites']"

【问题讨论】：

标签： python python-3.x pandas

【解决方案1】：

将str.findall 用于'' 之间的所有值：

df['categories'] = df['categories'].str.findall('\'(.*?)\'')
print (df)
                                          categories
0  [business finance#mergers & acquisitions, busi...
1        [entertainment$movies, entertainment&music]
2  [sports&volleyball, sports&football, sports$ba...

【讨论】：

@Mavrick - 什么返回 print (df['categories'].iloc[1:5].to_dict()) ？请将1 或5 更改为\n 的捕获值
@Mavrick - 你现在能检查一下吗？
@Mavrick - 超级，你的字符串 df['categories'][0] 帮了我很多忙 ;)
我可以在https://stackoverflow.com/questions/51864822/matching-elements-of-pandas-column-with-column-of-another-pandas-dataframe/51869865#51869865 上寻求您的帮助吗？这将是我的荣幸。
@Mavrick - 不容易的问题，但我可以试试。