BeautifulSoup with XML

demo.py

from bs4 import BeautifulSoup

# Read XML with XML parser
with open('template.xml') as fp:
    soup = BeautifulSoup(fp, 'xml')

# Modify value of a tag
soup.size.width.string = 'Something New'
# Equal to soup.annotation.size.width

# Add a tag
obj_tag = soup.new_tag('object')
soup.annotation.append(obj_tag)

# Print with prettified text
print(soup.prettify())