MongoDB使用mongoexp时出现意外的字符编码

Question

我在一个集合上使用mongoexport，该集合包含以utf8编码的外来字符，以及包含mongoexport似乎正在编码的字符的字段（例如，'&；'）。我注意到的是mongoexport对'&；'字符执行unicode转义，但对像'u'这样的字符没有转义。这带来了一个问题，因为我试图使用Python读取这些数据，但是由于有两种不同的编码方式，所以无法正确解码。在

例如（mongo query to get record）：

db.Military_Handbooks.findOne({_id: ObjectId("5bf61c80e173a2a10b53ad39")}).PRIMARY_AUTHOR

[
  "Dürer, Albrecht",
  [
    [
      "http://ustc.ac.uk/index.php/search/cicero?tm_fulltext=&tm_field_allauthr=Dürer, Albrecht&tm_translator=&tm_editor=&tm_field_short_title=&tm_field_imprint=&tm_field_place=&sm_field_year=&f_sm_field_year=&t_sm_field_year=&sm_field_country=&sm_field_lang=&sm_field_format=&sm_field_digital=&tm_field_class=&tm_field_cit_name=&tm_field_cit_no=&order=",
      " Dürer, Albrecht"
    ]
  ]
]

运行以下mongoexport命令（如果导出为json，则相同）：

^{pr2}$

在尝试将其读入Python时：

In [24]: import pandas
In [25]: c = pandas.read_csv('Military_Handbooks2.csv')
In [26]: c.at[1, 'PRIMARY_AUTHOR']
Out[26]: '["Dürer, Albrecht",[["http://ustc.ac.uk/index.php/search/cicero?tm_fulltext=\\u0026tm_field_allauthr=Dürer, Albrecht\\u0026tm_translator=\\u0026tm_editor=\\u0026tm_field_short_title=\\u0026tm_field_imprint=\\u0026tm_field_place=\\u0026sm_field_year=\\u0026f_sm_field_year=\\u0026t_sm_field_year=\\u0026sm_field_country=\\u0026sm_field_lang=\\u0026sm_field_format=\\u0026sm_field_digital=\\u0026tm_field_class=\\u0026tm_field_cit_name=\\u0026tm_field_cit_no=\\u0026order="," Dürer, Albrecht"]]]'
In [27]: c.at[1, 'PRIMARY_AUTHOR'].encode().decode('unicode-escape')
Out[27]: '["Dürer, Albrecht",[["http://ustc.ac.uk/index.php/search/cicero?tm_fulltext=&tm_field_allauthr=Dürer, Albrecht&tm_translator=&tm_editor=&tm_field_short_title=&tm_field_imprint=&tm_field_place=&sm_field_year=&f_sm_field_year=&t_sm_field_year=&sm_field_country=&sm_field_lang=&sm_field_format=&sm_field_digital=&tm_field_class=&tm_field_cit_name=&tm_field_cit_no=&order="," Dürer, Albrecht"]]]'

规格：
操作系统：Ubuntu 18.04.1 LTS
Python:3.6.7
MongoDB外壳版本v3.6.9

Answer 1

最终，在忽略错误的情况下重新编码文件似乎已经做到了这一点。在

def encoding():
    for fn in os.listdir('.'):
        if '2' not in fn and 'failed' not in fn and 'decode' not in fn:
            try:
                with codecs.open(fn, encoding='utf-8') as fd:
                    text = fd.read()
                    text = text.encode('Windows-1252', errors='ignore').decode('utf-8', errors='ignore')
                with codecs.open(fn[:fn.rfind('.')]+'2.csv', 'w', encoding='utf-8') as fd:
                        fd.write(text)
            except Exception as ex:
                print(ex)
                print('*'*50, '\n')

我还应该注意到我链接到了这篇文章，这篇文章很有帮助：how to export correctly accented words with mongoexport。在