Python 3 xml parsing and printing problem
Question
I have a sample xml file as below
<?xml version="1.0" encoding="UTF-8" standalone="no"?><!--Created with JFLAP 7.1.--><structure>
<type>fa</type>
<automaton>
<!--The list of states.-->
<state id="0" name="q1">
<x>104.0</x>
<y>149.0</y>
<initial/>
</state>
<state id="1" name="q2">
<x>210.0</x>
<y>153.0</y>
<final/>
</state>
<state id="2" name="q3">
<x>292.0</x>
<y>155.0</y>
</state>
<!--The list of transitions.-->
<transition>
<from>0</from>
<to>0</to>
<read>0</read>
</transition>
<transition>
<from>1</from>
<to>1</to>
<read>1</read>
</transition>
<transition>
<from>0</from>
<to>1</to>
<read>1</read>
</transition>
<transition>
<from>2</from>
<to>1</to>
<read>0</read>
</transition>
<transition>
<from>1</from>
<to>2</to>
<read>0</read>
</transition>
<transition>
<from>2</from>
<to>1</to>
<read>1</read>
</transition>
</automaton>
</structure>
I'm trying to print all the name attributes of the state tag except id So far here is my code:
import xml.etree.ElementTree as ET
tree = ET.parse('test.xml')
root = tree.getroot()
for automaton in root.findall('automaton'):
state = automaton.find('state')
state_name = state.get('name')
print(state_name)
My Current output:
q1
My Expected output:
q1
q2
q3
I'm confused because isn't the for loop in my code would print all the name attributes? Where did I do wrong and how do I fix it? Thank you~
1 answers
solution1
0 2021-01-29 22:36:58
You are lacking another findall in your code. There are multiple state tags.
See this code below. (I substituted a text io buffer for a file.)
xml = """<?xml version="1.0" encoding="UTF-8" standalone="no"?><!--Created with JFLAP 7.1.--><structure>
<type>fa</type>
<automaton>
<!--The list of states.-->
<state id="0" name="q1">
<x>104.0</x>
<y>149.0</y>
<initial/>
</state>
<state id="1" name="q2">
<x>210.0</x>
<y>153.0</y>
<final/>
</state>
<state id="2" name="q3">
<x>292.0</x>
<y>155.0</y>
</state>
<!--The list of transitions.-->
<transition>
<from>0</from>
<to>0</to>
<read>0</read>
</transition>
<transition>
<from>1</from>
<to>1</to>
<read>1</read>
</transition>
<transition>
<from>0</from>
<to>1</to>
<read>1</read>
</transition>
<transition>
<from>2</from>
<to>1</to>
<read>0</read>
</transition>
<transition>
<from>1</from>
<to>2</to>
<read>0</read>
</transition>
<transition>
<from>2</from>
<to>1</to>
<read>1</read>
</transition>
</automaton>
</structure>"""
from io import StringIO
import xml.etree.ElementTree as ET
xml_file = StringIO(xml)
tree = ET.parse(xml_file)
root = tree.getroot()
for automaton in root.findall('automaton'):
for state in automaton.findall('state'): # find all the 'state' tags
state_name = state.get('name')
print(state_name)
OUTPUT:
q1
q2
q3
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