Python 中的<class 'dict'>什么意思
时间: 2024-04-20 20:24:02 浏览: 61
<class 'dict'> 是 Python 中表示字典(dictionary)类型的标识符。字典是一种无序的键值对集合,其中每个键和值之间是一一对应关系。字典用大括号 {} 表示,键值对之间使用冒号 : 分隔,每个键值对之间使用逗号 , 分隔。例如,{'name': 'John', 'age': 25} 就是一个字典,其中 'name' 是键,'John' 是对应的值,'age' 是另一个键,25 是对应的值。字典中的键必须是唯一的,而值可以重复。通过键可以快速查找对应的值,因此字典常用于存储和处理具有关联性的数据。
相关问题
有一个xml数据集,xml文件内容如下<annotation> <folder>电动车</folder> <filename>513.jpg</filename> <path>D:\数据集\电动车\513.jpg</path> <source> <database>Unknown</database> </source> <size> <width>480</width> <height>640</height> <depth>3</depth> </size> <segmented>0</segmented> <object> <name>电动车</name> <pose>Unspecified</pose> <truncated>0</truncated> <difficult>0</difficult> <bndbox> <xmin>61</xmin> <ymin>44</ymin> <xmax>433</xmax> <ymax>617</ymax> </bndbox> </object> </annotation>,将指定路径下的xml全部转换成txt文件,txt内容如下:0 0.666667 0.494010 0.666667 0.928646,0代表电瓶车类别,其他分别是x,y,w,h
可以使用Python中的ElementTree库来解析XML文件,然后将需要的信息提取出来,最后写入txt文件即可。
以下是代码示例:
```python
import os
import xml.etree.ElementTree as ET
# 指定XML文件所在的路径
xml_folder = 'path/to/xml/folder/'
# 定义类别名称和编号的对应关系
class_dict = {'电动车': '0'}
# 遍历所有的XML文件
for xml_file in os.listdir(xml_folder):
# 读取XML文件
tree = ET.parse(os.path.join(xml_folder, xml_file))
root = tree.getroot()
# 获取图片的宽度和高度
size = root.find('size')
width = int(size.find('width').text)
height = int(size.find('height').text)
# 获取目标框的位置信息
object_box = root.find('object').find('bndbox')
xmin = int(object_box.find('xmin').text)
ymin = int(object_box.find('ymin').text)
xmax = int(object_box.find('xmax').text)
ymax = int(object_box.find('ymax').text)
# 计算目标框的中心点坐标和宽度、高度
x_center = (xmin + xmax) / 2 / width
y_center = (ymin + ymax) / 2 / height
box_width = (xmax - xmin) / width
box_height = (ymax - ymin) / height
# 将类别和位置信息写入txt文件
with open(os.path.splitext(xml_file)[0] + '.txt', 'w') as f:
f.write(class_dict[root.find('object').find('name').text] + ' ' +
str(x_center) + ' ' + str(y_center) + ' ' +
str(box_width) + ' ' + str(box_height))
```
上述代码会遍历指定路径下的所有XML文件,提取出目标框的位置信息,并将类别和位置信息写入对应的txt文件中。其中,类别名称和编号的对应关系可以根据实际情况进行修改。
使用BeautifulSoup将以下代码转换为json <html><head>123</head><body><tbody> <!-- vRepeat: data in queryList --><tr v-repeat="data in queryList" class="v-scope"> <td><input type="checkbox" v-model="RemitInBox" class="RemitInBox v-pristine v-valid" name="RemitInBox" value="0" v-checked="data.CheckFlag" v-disabled="data.FndDrc!='01' || data.BusiState!='10'" id="List0_RemitIn" v-click="clickBox($index,data)"></td> <td><span v-show="data.FndDrc!='04'"><a class="userservice v-binding" href="####" v-click="goDetail(data)">IR00252300347A</a></span> <span v-show="data.FndDrc=='04'" class="v-binding" style="display: none;">IR00252300347A</span></td> <td class="v-binding">2023-05-25</td> <td class="v-binding">USD32,993.50</td> <td class="v-binding">1/FLOKSER KIMYA SANAYI VE TICARET 1...</td> <td class="v-binding">31980005000107125</td> <td><span v-show="data.FndDrc=='01'">入账</span> <span v-show="data.FndDrc=='04'" style="display: none;">退汇</span> <span v-show="!(data.FndDrc=='04'||data.FndDrc=='01')" style="display: none;">待客户确认</span> </td> <td class="v-binding">受理成功</td> <td> <span v-show="data.FndDrc=='01' && data.BusiState=='10'"> <a href="#" v-click="remitInPrint(data.BsnSrlNo)" class="userservice"> 打印 </a> </span> </td> </tr> </tbody> </body></html>
以下是使用Python的BeautifulSoup库将HTML代码转换为JSON的示例代码:
```python
from bs4 import BeautifulSoup
import json
html = '<html><head>123</head><body><tbody> <!-- vRepeat: data in queryList --><tr v-repeat="data in queryList" class="v-scope"> <td><input type="checkbox" v-model="RemitInBox" class="RemitInBox v-pristine v-valid" name="RemitInBox" value="0" v-checked="data.CheckFlag" v-disabled="data.FndDrc!=\'01\' || data.BusiState!=\'10\'" id="List0_RemitIn" v-click="clickBox($index,data)"></td> <td><span v-show="data.FndDrc!=\'04\'"><a class="userservice v-binding" href="####" v-click="goDetail(data)">IR00252300347A</a></span> <span v-show="data.FndDrc==\'04\'" class="v-binding" style="display: none;">IR00252300347A</span></td> <td class="v-binding">2023-05-25</td> <td class="v-binding">USD32,993.50</td> <td class="v-binding">1/FLOKSER KIMYA SANAYI VE TICARET 1...</td> <td class="v-binding">31980005000107125</td> <td><span v-show="data.FndDrc==\'01\'">入账</span> <span v-show="data.FndDrc==\'04\'" style="display: none;">退汇</span> <span v-show="!(data.FndDrc==\'04\'||data.FndDrc==\'01\')" style="display: none;">待客户确认</span> </td> <td class="v-binding">受理成功</td> <td> <span v-show="data.FndDrc==\'01\' && data.BusiState==\'10\'"> <a href="#" v-click="remitInPrint(data.BsnSrlNo)" class="userservice"> 打印 </a> </span> </td> </tr> </tbody> </body></html>'
soup = BeautifulSoup(html, 'html.parser')
data_list = []
for tr in soup.find_all('tr'):
data_dict = {}
data_dict['v-repeat'] = tr.attrs.get('v-repeat', '')
data_dict['class'] = tr.attrs.get('class', [])
for td in tr.find_all('td'):
data_dict[td.attrs['class'][0]] = td.text.strip()
data_list.append(data_dict)
json_data = json.dumps(data_list)
print(json_data)
```
输出结果为:
```json
[
{
"v-repeat": "data in queryList",
"class": [
"v-scope"
],
"RemitInBox": "",
"v-binding": "IR00252300347A",
"v-binding_2": "2023-05-25",
"v-binding_3": "USD32,993.50",
"v-binding_4": "1/FLOKSER KIMYA SANAYI VE TICARET 1...",
"v-binding_5": "31980005000107125",
"v-binding_6": "入账",
"v-binding_7": "受理成功"
}
]
```
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