感谢您在以下方面的帮助：我需要读取一个大型 XML 文件并将其转换为 CSV。
我有两个函数应该做同样的事情，只有一个（function1）使用 iterparse（因为我需要处理大约 2GB 的文件）和另一个不使用（function2）。
Function2 对于相同的 XML 文件（但最大 150 MB）工作得非常好，但在该大小之后，它会因内存而失败。
我遇到的问题是，尽管代码（对于 function1）没有给出错误，但它会丢失一些孩子（这是一个大问题！）。另一方面，Function2 读取所有子项，并且不会“松动”或失败。
问：你能在function1的代码中看到一些孩子会丢失（或阅读不正确，或被忽略）的原因吗？
注意 1：我准备好发送一个 50 KB 的 XML 示例，以备不时之需。
注2：变量“nchil_count”只是为了计算孩子的数量。
代码（功能1）：
def function1 ():
# This function uses Iterparse
# Doesn't give errors but looses some children. Why?
# prints output to csv file, WCEL.csv
from xml.etree.cElementTree import iterparse
fname = "C:\Leonardo\Input data\Xml input data\NetactFiles\Netact_3g_rnc11_t1.xml"
# ELEMENT_LIST = ["WCEL"]
# Delete contents from exit file
open("C:\Leonardo\Input data\Xml input data\WCEL.csv", 'w').close()
# Open exit file
with open("C:\Leonardo\Input data\Xml input data\WCEL.csv", "a") as exit_file:
with open(fname) as xml_doc:
context = iterparse(xml_doc, events=("start", "end"))
context = iter(context)
event, root = context.next()
for event, elem in context:
if event == "start" and elem.tag == "{raml20.xsd}managedObject":
# if event == "start":
if elem.get('class') == 'WCEL':
print elem.attrib
# print elem.tag
element = elem.getchildren()
nchil_count = 0
for child in element:
if child.tag == "{raml20.xsd}p":
nchil_count = nchil_count + 1
# print child.tag
# print child.attrib
val = child.text
# print val
val = str (val)
exit_file.write(val + ",")
exit_file.write('\n')
print nchil_count
elif event == "end" and elem.tag == "{raml20.xsd}managedObject":
# Clear Memory
root.clear()
xml_doc.close()
exit_file.close()
return ()
代码（功能2）：
def function2 (xmlFile):
# Using Element Tree
# Successful
# Works well with files of 150 MB, like an XML (RAML) RNC export from Netact (1 RNC only)
# It fails with huge files due to Memory
import xml.etree.cElementTree as etree
import shutil
with open("C:\Leonardo\Input data\Xml input data\WCEL.csv", "a") as exit_file:
# Populate the values per cell:
tree = etree.parse(xmlFile)
for value in tree.getiterator(tag='{raml20.xsd}managedObject'):
if value.get('class') == 'WCEL':
print value.attrib
element = value.getchildren()
nchil_count = 0
for child in element:
if child.tag == "{raml20.xsd}p":
nchil_count = nchil_count + 1
# print child.tag
# print child.attrib
val = child.text
# print val
val = str (val)
exit_file.write(val + ",")
exit_file.write('\n')
print nchil_count
exit_file.close() ## File closing after writing.
return ()