Update ch02.ipynb

[krouser]

I've added this peice to the code to handle ssl error on VSCode:

ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1007)

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[rasbt]

Hi there, and thanks for adding this PR!

By the way, I don't think it's a VSCode issue per se. Usually, this code shouldn't be necessary.

I suspect what might have happened is that VSCode accidentally defaulted to an old Python version. Could you kindly double check which Python version you are using in VSCode and whether it's older then say 3.9?

PS: May I also ask which operating system you are using? In case this is still an issue with a newer Python version, depending on your operating system, there are also global ways to fix the certificate issue. Perhaps the easiest and most universal one is pip install certifi.

[krouser]

Thank you, its was a problem with the python version...

[rasbt]

Nice, I am glad it got resolved!

[vplusg]

I've added this peice to the code to handle ssl error on VSCode:

ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1007)

I tried the solution above but it didn't work for me I am afraid.
ssl._create_default_https_context = ssl._create_stdlib_context
Not sure if there were some implict steps that weren't mentioned that I missed.

I had to create a context using SSLContext. Then using urllib I created a handler and an opener and then installed it globally only then
urllib.request.urlretrieve(url, file_path)
worked for me otherwise I continued to get
URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1000)>

Here is my code:

import os
import urllib.request
import ssl

# Creating an SSL context to disable SSL verification
context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE

# Creating an HTTPS handler using the context
my_https_handler = urllib.request.HTTPSHandler(context=context)

# Creating opener with the HTTPS handler
my_opener = urllib.request.build_opener(my_https_handler)

# Install the opener globally
urllib.request.install_opener(my_opener)

print("Checking if file already exists")
file_path = "./the-verdict.txt"
# Now, urlretrieve will use the context
if not os.path.exists(file_path):
    print("File doesn't exist.")
    url = ("https://raw.githubusercontent.com/rasbt/"
           "LLMs-from-scratch/main/ch02/01_main-chapter-code/"
           "the-verdict.txt")
    print("Retrieving file ...")
    urllib.request.urlretrieve(url, file_path)
    print("Download complete to "+ file_path)
else:
    print("File exists")

# Reverting opener to the default opener
urllib.request.install_opener(urllib.request.build_opener())

[rasbt]

Thanks for sharing and sorry about the trouble. May I ask what version of Python you are/were using? I think Python versions below 3.10 may have some SSL issues and you'd either need to upgrade Python or update the underlying packages:

pip install --upgrade certifi