python怎么读xml文件_python读和写xml文件

读取xml文件

在pascal_voc里面就常见到这种，整理一下。

比如一个原文件是这样的

VOC2007

008973.jpg

The VOC2007 Database

PASCAL VOC2007

flickr

335707085

kjmurray

Katherine Murray

500

333

3

1

cow

Unspecified

0

0

271

43

444

279

那读的时候可以这样读

Python 3.6.5 |Anaconda, Inc.| (default, Apr 29 2018, 16:14:56)

[GCC 7.2.0] on linux

Type "help", "copyright", "credits" or "license" for more information.

>>> import xml.etree.ElementTree as ET

>>> tree = ET.parse("008973.xml")

>>> objs = tree.findall("object")

>>> objs

[]

>>> imgpath = tree.find("filename").text.strip()

>>> imgpath

'008973.jpg'

>>> for idx, obj in enumerate(objs):

... bbox = obj.find("bndbox")

... x1 = float(bbox.find("xmin").text)-1

... print(x1)

...

270.0

>>>

xml 的写入

from xml.dom.minidom import Document

def main():

# 创建dom文档

doc = Document()

# 创建根节点

orderlist = doc.createElement("orderlist")

# 根节点insert dom 树

doc.appendChild(orderlist)

#

mydict = dict(zip(range(5), range(0,5,2)))

for k, v in mydict.items():

# 每一组信息都要先创建节点order，后insert到下面

order = doc.createElement("order")

orderlist.appendChild(order)

# 下面的也是先创建节点然后insert到其父节点上面。

customer = doc.createElement("customer")

customer_text = doc.createTextNode(str(k))

customer.appendChild(customer_text)

order.appendChild(customer)

#with open("xml.xml", "w") as w:

# w.write(doc.toprettyxml(indent='t'))

with open("xml.xml", "wb+") as w:

w.write(doc.toprettyxml(indent='t', encoding="utf-8"))

return

if __name__ == '__main__':

main()

写完后的结果是

0

1

2

~