configparser.NoOptionError: No option 'inputpath' in section: 'DEFAULT'

I am trying to use configparser for the first time to save some default values. I'm receiving the error: configparser.NoOptionError: No option 'inputpath' in section: 'DEFAULT'

Here's the code I've written. The commented out part, "Write the Configuration File," is how the file was created. The output file looks fine to me.

[DEFAULT]
inputpath = Test Line 1
outputpath = Test Line 2
filename = Test Line 3

If I delete the file, as expected I get the error: FileNotFoundError: [Errno 2] No such file or directory: 'config.ini'

import os
import configparser


config = configparser.ConfigParser()

# Write the Configuration File
# config['DEFAULT']['inputpath'] = 'Test Line 1'
# config['DEFAULT']['outputpath'] = 'Test Line 2'
# config['DEFAULT']['filename'] = 'Test Line 3'
# with open('config.ini', 'w') as configfile:
#    config.write(configfile)

if os.path.exists('config.ini'):
    print('The path exists')
else:
     print('The path does not exist')

print("Check Before")
with open("config.ini", "r") as cfile:
    for line in cfile.readlines():
        print(line)
print("Check After")

print('Sections:')
print(config.sections())

with open("config.ini", "r") as configfile:
    config.read(configfile)

inputpath_default = config.get('DEFAULT', 'inputpath')
print('inputpath_default: ' + inputpath_default)
outputpath_default = config.get('DEFAULT', 'outputpath')
print('outputpath_default: ' + outputpath_default)
filename_default = config.get('DEFAULT', 'filename')
print('filename_default: ' + filename_default)

print('Done')

exit()

The output up to the failure is:

The path exists
Check Before
[DEFAULT]

inputpath = Test Line 1

outputpath = Test Line 2

filename = Test Line 3



Check After
Sections:
[]
Traceback (most recent call last):

...

  File "/Users/xxxxxx/Config.py", line 31, in <module>
    inputpath_default = config.get('DEFAULT', 'inputpath')
  File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/configparser.py", line 821, in get
    raise NoOptionError(option, section)
configparser.NoOptionError: No option 'inputpath' in section: 'DEFAULT'

My problem was that I had coded:

with open("config.ini", "r") as configfile:
    config.read(configfile)

Apparently there is no need to issue an explicit open. Changing those two lines to the following resolved my problem:

configfile="config.ini"
config.read(configfile)

Alternatively, the following also worked:

config.read_file(open('config.ini'))