DuplicateFlagError: The flag 'echo' is defined twice.

[Rich2006]

I tried to run below code provided in the repository but I get DuplicateFlagError, can you please assist.

from future import absolute_import
from future import division
from future import print_function

import sys

from absl import app
from absl import flags
from absl import logging

FLAGS = flags.FLAGS

flags.DEFINE_string('echo', None, 'Text to echo.')

def main(argv):
del argv # Unused.

print('Running under Python {0[0]}.{0[1]}.{0[2]}'.format(sys.version_info),
file=sys.stderr)
logging.info('echo is %s.', FLAGS.echo)

if name == 'main':
app.run(main)

See error below

DuplicateFlagError Traceback (most recent call last)
in
11 FLAGS = flags.FLAGS
12
---> 13 flags.DEFINE_string('echo', None, 'Text to echo.')
14
15

~\Anaconda3\envs\venv\lib\site-packages\absl\flags_defines.py in DEFINE_string(name, default, help, flag_values, **args)
239 parser = _argument_parser.ArgumentParser()
240 serializer = _argument_parser.ArgumentSerializer()
--> 241 DEFINE(parser, name, default, help, flag_values, serializer, **args)
242
243

~\Anaconda3\envs\venv\lib\site-packages\absl\flags_defines.py in DEFINE(parser, name, default, help, flag_values, serializer, module_name, **args)
80 """
81 DEFINE_flag(_flag.Flag(parser, serializer, name, default, help, **args),
---> 82 flag_values, module_name)
83
84

~\Anaconda3\envs\venv\lib\site-packages\absl\flags_defines.py in DEFINE_flag(flag, flag_values, module_name)
102 # Copying the reference to flag_values prevents pychecker warnings.
103 fv = flag_values
--> 104 fv[flag.name] = flag
105 # Tell flag_values who's defining the flag.
106 if module_name:

~\Anaconda3\envs\venv\lib\site-packages\absl\flags_flagvalues.py in setitem(self, name, flag)
428 # module is simply being imported a subsequent time.
429 return
--> 430 raise _exceptions.DuplicateFlagError.from_flag(name, self)
431 short_name = flag.short_name
432 # If a new flag overrides an old one, we need to cleanup the old flag's

DuplicateFlagError: The flag 'echo' is defined twice. First from C:\Users\lenovo\Anaconda3\envs\venv\lib\site-packages\ipykernel_launcher.py, Second from C:\Users\lenovo\Anaconda3\envs\venv\lib\site-packages\ipykernel_launcher.py. Description from first occurrence: Text to echo.

[Yilei Yang]

Are you using IPython? This is likely due to your code being run twice with the same process (thus the flag is defined twice).

This is a similar user report: #36 (comment)

[Rich2006]

Thank you!