Resolve NLTK utlopen error to work in offline mode

nltk-patch.py

# NLTK makes the assumption that users are online when importing the library.
# This is partly to automate the download or corpus files and other aassets,
# but if those files already exist then offline mode is problematic. `import nltk`
# will still work, but it takes a while to timeout, producing errors:
#
# [nltk_data] Error loading averaged_perceptron_tagger: <urlopen error
# [nltk_data]     [Errno -3] Temporary failure in name resolution>
# [nltk_data] Error loading punkt: <urlopen error [Errno -3] Temporary
# [nltk_data]     failure in name resolution>
# [nltk_data] Error loading stopwords: <urlopen error [Errno -3]
# [nltk_data]     Temporary failure in name resolution>
#
# To fix this, you must supply the NLTK files in an offline mode (e.g., download
# them once and supply them in the appropriate directory, such as `/root/nltk_data`.
# Then, in your code, override the `nltk.download` method with one that returns True.
import nltk

# Define a local function that returns True
def mock_nltk_download(*args, **kwargs):
    print(f"Skipping NLTK download for: {args[0]}")
    return True  # Return True to mimic successful download

# Patch the nltk.download function to use the locally defined function
nltk.download = mock_nltk_download

# Need to patch nltk.download before importing ChatBot to avoid online NLTK
# file check, so import it here.
from chatterbot import ChatBot

# ...