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text is not catcher in case 3 below
INPUT
import xml.etree.ElementTree as ET
root1 = ET.fromstring('<a>TEXT</a>')
print(root1.text)
root2 = ET.fromstring('<a>TEXT<b/></a>')
print(root2.text)
root3 = ET.fromstring('<a><b/>TEXT</a>')
print(root3.text)
CURRENT OUTPUT
TEXT
TEXT
None <---------- ERROR HERE
EXPECTED OUTPUT
TEXT
TEXT
TEXT

While a bit confusing, I don't think this is a bug. Note the definition of the "tail" attribute of an element:
"If the element is created from an XML file the attribute will contain any text found after the element’s end tag and before the next tag."
Unlike in root1 and root2 where 'TEXT' is before the end of element a and the start of element b (in root2), 'TEXT' in root3 follows the end tag of element b and so is associated with it as its tail attribute.
>>> root3
<Element 'a' at 0x1022ab188>
>>> root3[0]
<Element 'b' at 0x1022ab1d8>
>>> root3[0].tail
'TEXT'
https://docs.python.org/3/library/xml.etree.elementtree.html#xml.etree.ElementTree.Element.tail