【问题标题】:I can't seem to delete keys of a dictionary whose value contains a certain string, why?我似乎无法删除值包含某个字符串的字典的键,为什么?
【发布时间】:2020-08-04 10:33:29
【问题描述】:

我的代码采用 XML 文件,采用 new_line 标记的子元素(text 标记)并将它们的索引作为键存储在字典中,并将元素作为值存储在同一个字典中。我想删除值包含“10.238”的字典的键,但它似乎不起作用。其他一切都有效。这是我的代码:

import re
from xml.dom import minidom
from xml.etree import ElementTree as ET


def filter_values_by_keyword(my_dict, filter_by):
    """
    Return a list of values which contains `filter_by` keyword.

    Arguments:
        my_dict (dict): Dict containing (...data specifics here)
        filter_by (str): Keyword to look for in values of my_dict

    Return:
        List of filtered values
    """
    return [key for key, value in my_dict.items() if filter_by in value]


def get_xml_by_tag_names(xml_path, tag_name_1, tag_name_2):
    """
    Your docstring here.
    """
    data = {}
    xml_tree = minidom.parse(xml_path)
    item_group_nodes = xml_tree.getElementsByTagName(tag_name_1)
    for idx, item_group_node in enumerate(item_group_nodes):
        cl_compile_nodes = item_group_node.getElementsByTagName(tag_name_2)
        for _ in cl_compile_nodes:
            data[idx]=[item_group_node.toxml()]
    return data


def main():
    data = get_xml_by_tag_names('output2.xml', 'new_line', 'text')
    filtered_values = filter_values_by_keyword(data, '10.238')

    for item in filtered_values:
        del data[item]

    for value in data.values():
        myxml = ' '.join(value)
        # print(myxml)

        tree = ET.fromstring(myxml)
        lista = ([text.text for text in tree.findall('text')])
        testo = (' '.join(lista))

        print(testo)


if __name__ == "__main__":
    main()

这是一个 XML 示例:

    <pages>
      <page id="1" bbox="0.000,0.000,462.047,680.315" rotate="0">
        <textbox id="0" bbox="191.745,592.218,249.042,603.578">
    <textline>
         <new_line>
                  <text font="NUMPTY+ImprintMTnum" bbox="297.284,540.828,300.188,553.310" colourspace="DeviceGray" ncolour="0" size="12.482">della quale non conosce che una parte;] </text>
                  <text font="PYNIYO+ImprintMTnum-Italic" bbox="322.455,540.839,328.251,553.566" colourspace="DeviceGray" ncolour="0" size="12.727">prima</text>
                  <text font="NUMPTY+ImprintMTnum" bbox="331.206,545.345,334.683,552.834" colourspace="DeviceGray" ncolour="0" size="7.489">1</text>
                  <text font="NUMPTY+ImprintMTnum" bbox="177.602,528.028,180.850,540.510" colourspace="DeviceGray" ncolour="0" size="12.482">che nonconosce ancora appieno;</text>
                  <text font="NUMPTY+ImprintMTnum" bbox="189.430,532.545,192.908,540.034" colourspace="DeviceGray" ncolour="0" size="7.489">2</text>
                  <text font="NUMPTY+ImprintMTnum" bbox="203.879,528.028,208.975,540.510" colourspace="DeviceGray" ncolour="0" size="12.482">che</text>
                </new_line>
    </textline>
<textline bbox="68.032,408.428,372.762,421.166">
<new_line>
          <text font="NUMPTY+ImprintMTnum" bbox="307.143,408.428,310.392,420.910" colourspace="DeviceGray" ncolour="0" size="12.482">viso] vi</text>
          <text font="NUMPTY+ImprintMTnum" bbox="310.280,408.808,313.243,419.046" colourspace="DeviceGray" ncolour="0" size="10.238">-</text>
          <text font="PYNIYO+ImprintMTnum-Italic" bbox="320.072,408.439,325.868,421.166" colourspace="DeviceGray" ncolour="0" size="12.727">su</text>
          <text font="NUMPTY+ImprintMTnum" bbox="328.829,408.428,338.452,420.910" colourspace="DeviceGray" ncolour="0" size="12.482">m</text>
        </new_line>
</textline>
    </textbox>
    </page>
    </pages>

【问题讨论】:

  • filtered_values = filter_values_by_keyword(data, '10.238') 之后检查filtered_values 的值——这应该可以解决问题。
  • 是的,这是一个空列表!
  • 你看过这个question吗?
  • 所以现在检查data 的值,看看为什么在那里找不到'10.238' - 有三种可能:1) 在data 中根本没有类似的东西; 2)您正在寻找一个字符串,而您的 data 包含一个数字; 3) 字符串'10.238' 在那里,但在子字典/子列表中,而不是直接作为data 字典中的值。
  • 值 10.238 从何而来?它不在 XML 中。

标签: python xml tags minidom


【解决方案1】:

再举一个例子,可能对你有帮助。

from simplified_scrapy import SimplifiedDoc,req,utils
html = '''
Your xml
'''
doc = SimplifiedDoc(html)
# texts = doc.getElements('text').notContains('-',attr='text').text # Filter with text
texts = doc.getElements('text').notContains('10.238',attr='size').text # Filter with size
print(texts)

结果:

['della quale non conosce che una parte;]', 'prima', '1', 'che nonconosce ancora appieno;', '2', 'che', 'viso] vi', 'su', 'm']

这里有更多示例。 https://github.com/yiyedata/simplified-scrapy-demo/tree/master/doc_examples

【讨论】:

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