input: Write a python function to parse an XML file and extract titles and descriptions of items.
  assert parse_xml('items.xml')==[('Item1', 'Description1'), ('Item2', 'Description2')]
  assert parse_xml('items_empty.xml')==[]
  assert parse_xml('items_single.xml')==[('SingleItem', 'SingleDescription')]
output: def parse_xml(file_path):
      import xml.etree.ElementTree as ET
      tree = ET.parse(file_path)
      root = tree.getroot()
      items = []
      for item in root.findall('item'):
          title = item.find('title').text
          description = item.find('description').text
          items.append((title, description))
      return items