from xml.etree import ElementTree as ET
import shutil, os

text = """<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Properties xmlns="http://schemas.openxmlformats.org/officeDocument/2006/extended-properties" xmlns:vt="http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes"><Application>Microsoft Excel</Application><DocSecurity>0</DocSecurity><ScaleCrop>false</ScaleCrop><HeadingPairs><vt:vector size="4" baseType="variant"><vt:variant><vt:lpstr>Worksheets</vt:lpstr></vt:variant><vt:variant><vt:i4>10</vt:i4></vt:variant><vt:variant><vt:lpstr>Named Ranges</vt:lpstr></vt:variant><vt:variant><vt:i4>4</vt:i4></vt:variant></vt:vector></HeadingPairs><TitlesOfParts><vt:vector size="14" baseType="lpstr"><vt:lpstr>types</vt:lpstr><vt:lpstr>empty</vt:lpstr><vt:lpstr>scatter</vt:lpstr><vt:lpstr>merged_cells</vt:lpstr><vt:lpstr>sheet_not_to_read</vt:lpstr><vt:lpstr>ssd_error1</vt:lpstr><vt:lpstr>ssd_error2</vt:lpstr><vt:lpstr>ssd_error3</vt:lpstr><vt:lpstr>semistrucdata1</vt:lpstr><vt:lpstr>semistrucdata2</vt:lpstr><vt:lpstr>single_nr</vt:lpstr><vt:lpstr>table1</vt:lpstr><vt:lpstr>table2</vt:lpstr><vt:lpstr>table3</vt:lpstr></vt:vector></TitlesOfParts><Company></Company><LinksUpToDate>false</LinksUpToDate><SharedDoc>false</SharedDoc><HyperlinksChanged>false</HyperlinksChanged><AppVersion>16.0300</AppVersion></Properties>"""
os.makedirs('subdir1')
os.makedirs('subdir2')
with open('subdir1/app.xml', 'w') as file:
    original_text = file.write(text)
with open('subdir2/app.xml', 'w') as file:
    original_text = file.write(text)

# correctly closed filehandle from source = io file handle
namespace = []
with open('subdir1/app.xml', 'r') as file:
    for event, elem in ET.iterparse(source=file, events=("start", "start-ns", "end-ns")):
        if event == "start-ns":
            elem = ('default', elem[1]) if elem[0] == '' else elem
            namespace.append(elem)
        if event == "start":
            break
print(namespace)
shutil.rmtree('subdir1')

# incorrectly closed filehandle from source = string type
namespace = []
for event, elem in ET.iterparse(source='subdir2/app.xml', events=("start", "start-ns", "end-ns")):
    if event == "start-ns":
        elem = ('default', elem[1]) if elem[0] == '' else elem
        namespace.append(elem)
    if event == "start":
        # ISSUE IS HERE: the break which seems okay to code in a for-loop actually breaks out of a while True loop within iterparse
        # that ends up not closing the file, thereby keeping a lock on the file.
        # this is demonstrated below when we try to delete the folder containing this file, but we cannot do so.
        break
    
print(namespace)
shutil.rmtree('subdir2')