python - 将 xml.etree.ElementTree 转换为字符串引发 "TypeError: argument of type ' int' 不可迭代”

Question

我有一个使用 xml.etree.ElementTree 创建的简单 XML 元素在 Python 3 中。

import xml.etree.ElementTree as ElementTree
person = ElementTree.Element("Person", Name="John", Age=18)

我可以使用 Element.get()从我的元素访问单个属性没有任何问题。

name = person.get("Name")
age = person.get("Age")
print(name + " is " + str(age) + " years old.")
# output: "John is 18 years old"

但是，如果我尝试使用 .tostring() 将我的元素转换为字符串，我得到一个错误“TypeError: argument of type 'int' is not iterable”。

print(ElementTree.tostring(person))  # TypeError

为什么我不能在具有整数属性的 xml.etree.ElementTree.Element 上使用 .tostring()？

---

完整代码:

import xml.etree.ElementTree as ElementTree

person = ElementTree.Element("Person", Name="John", Age=18)
print(ElementTree.tostring(person))  # TypeError

完整回溯:

Traceback (most recent call last):
  File "C:\Users\svascellar\AppData\Local\Programs\Python\Python36-32\lib\xml\etree\ElementTree.py", line 1079, in _escape_attrib
    if "&" in text:
TypeError: argument of type 'int' is not iterable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:/Users/svascellar/.PyCharmCE2017.3/config/scratches/scratch_13.py", line 3, in <module>
    print(ElementTree.tostring(person))
  File "C:\Users\svascellar\AppData\Local\Programs\Python\Python36-32\lib\xml\etree\ElementTree.py", line 1135, in tostring
    short_empty_elements=short_empty_elements)
  File "C:\Users\svascellar\AppData\Local\Programs\Python\Python36-32\lib\xml\etree\ElementTree.py", line 776, in write
    short_empty_elements=short_empty_elements)
  File "C:\Users\svascellar\AppData\Local\Programs\Python\Python36-32\lib\xml\etree\ElementTree.py", line 933, in _serialize_xml
    v = _escape_attrib(v)
  File "C:\Users\svascellar\AppData\Local\Programs\Python\Python36-32\lib\xml\etree\ElementTree.py", line 1102, in _escape_attrib
    _raise_serialization_error(text)
  File "C:\Users\svascellar\AppData\Local\Programs\Python\Python36-32\lib\xml\etree\ElementTree.py", line 1057, in _raise_serialization_error
    "cannot serialize %r (type %s)" % (text, type(text).__name__)
TypeError: cannot serialize 18 (type int)

Answer 1

即使 Age 是一个数值，xml 属性值也应该是带引号的字符串:

person = ElementTree.Element("Person", Name="John", Age="18")

或者，如果数据存储为变量，则使用 str()

将其转换为字符串

age = 18
person = ElementTree.Element("Person", Name="John", Age=str(age))