How to catch an exception and get exception type in Python? - python-3.x

Question

[Question] I need user to provide GDrive link to their kaggle.json file so I can set it up, when the script is run first time without kaggle.json file it throws an error and I am trying to handle it but without any success, my first question is same as title of this post, and second is does this make any sense all of this? Is there a better way to do this?
[Background] I am trying to write a script that acts as an interface providing limited access to functionalities of Kaggle library so that it runs in my projects and still being able to share it on GitHub so that others can use it in similar projects, I will bundle this along with configuration management tool or with shell script.
This is the code:
#!/usr/bin/env python3
import os
import sys
import traceback
import gdown
import kaggle
import argparse
"""
A wrapper around the kaggle library that provides limited access to the kaggle library
"""
#*hyperparameters
dataset = 'roopahegde/cryptocurrency-timeseries-2020'
raw_data_folder = './raw'
kaggle_api_file_link = None
#*argument parser
parser = argparse.ArgumentParser(description="download dataset")
parser.add_argument('--kaggle_api_file', type=str, default=kaggle_api_file_link, help="download and set kaggle API file [Gdrive link]")
parser.add_argument("--kaggle_dataset", type=str,
default=dataset, help="download kaggle dataset using user/datasets_name")
parser.add_argument("--create_folder", type=str, default=raw_data_folder, help="create folder to store raw datasets")
group = parser.add_mutually_exclusive_group()
group.add_argument('-preprocess_folder', action="store_true", help="create folder to store preprocessed datasets")
group.add_argument('-v', '--verbose', action="store_true", help="print verbose output")
group.add_argument('-q', '--quiet', action="store_true", help="print quiet output")
args = parser.parse_args()
#*setting kaggle_api_file
if args.kaggle_api_file:
gdown.download(args.kaggle_api_file, os.path.expanduser('~'), fuzzy=True)
#*creating directories if not exists
if not os.path.exists(args.create_folder):
os.mkdir(args.create_folder)
if not os.path.exists('./preprocessed') and args.preprocess_folder:
os.mkdir('./preprocessed')
def main():
try:
#*downloading datasets using kaggle.api
kaggle.api.authenticate()
kaggle.api.dataset_download_files(
args.kaggle_dataset, path=args.create_folder, unzip=True)
kaggle.api.competition_download_files
#*output
if args.verbose:
print(
f"Dataset downlaoded from https://www.kaggle.com/{args.kaggle_dataset} in {args.create_folder}")
elif args.quiet:
pass
else:
print(f"Download Complete")
except Exception as ex:
print(f"Error occured {type(ex)} {ex.args} use flag --kaggle_api_file to download and set kaggle api file")
if __name__ == '__main__':
sys.exit(main())
I tried to catch IOError and OSError instead of catching generic Exception, still no success. I want to print a message telling user to use --kaggle_api_file flag to set up kaggle.json file.
This is the error:
python get_data.py
Traceback (most recent call last):
File "get_data.py", line 7, in <module>
import kaggle
File "/home/user/.local/lib/python3.8/site-packages/kaggle/__init__.py", line 23, in <module>
api.authenticate()
File "/home/user/.local/lib/python3.8/site-packages/kaggle/api/kaggle_api_extended.py", line 164, in authenticate
raise IOError('Could not find {}. Make sure it\'s located in'
OSError: Could not find kaggle.json. Make sure it's located in /home/user/.kaggle. Or use the environment method.