ipykernel_launcher.py: error: unrecognized arguments: -f /home/

Project scene:¶

The code in the IDE uses parser.parse_args(), and an error occurs when called under jupyter.

Problem Description¶

Error:

usage: ipykernel_launcher.py [-h] [--data_dir DATA_DIR]
                             [--output_dir OUTPUT_DIR]
                             [--embedding_path EMBEDDING_PATH]
                             .....

ipykernel_launcher.py: error: unrecognized arguments: -f /home/xxx/.local/share/jupyter/runtime/kernel-0fad9201-af20-4945-86b4-eeafe5b0d8b2.json
An exception has occurred, use %tb to see the full traceback.

SystemExit: 2

Cause Analysis

This is because calling parser.parse_args() will read the system parameters: sys.argv[], which is the correct parameter when called from the command line, and when called in jupyter notebook, the value of sys.argv is ipykrnel_launcher.py:

['/home/xxx/anaconda3/envs/pt/lib/python3.8/site-packages/ipykernel_launcher.py',
 '-f',
 '/home/xxx/.local/share/jupyter/runtime/kernel-0fad9201-af20-4945-86b4-eeafe5b0d8b2.json']

solution¶

There are two solutions, one needs to modify the code, the second only needs to set sys.argv in jupyter.

1. Modify the code¶

Change parser.parse_args() to parser.parse_known_args()[0]

import argparse
parser = argparse.ArgumentParser()
args = parser.parse_known_args()[0]

Disadvantages: need to modify the code, not elegant.

2Modify system parameters¶

Set sys.argv in jupyter.

1.Get the correct sys.argv For example, enter the command line as:

python run.py

Its sys.argv is:

['run.py']

Tip: You can also add print(sys.argv) to the running code to get it, in the following form:

import sys
print(sys.argv)

2 Modify sys.argv

Add the following code to jupyter:

import sys
sys.argv = ['run.py']

In the code, run.py is modified to the sys.argv required by the current running code

If you don't want to modify the code, you can try the second method.