NLTK download SSL: Certificate verify failed
PythonSsl CertificateNltkPython Problem Overview
I get the following error when trying to install Punkt for nltk:
nltk.download('punkt')
[nltk_data] Error loading Punkt: <urlopen error [SSL: [nltk_data] CERTIFICATE_VERIFY_FAILED] certificate verify failed
[nltk_data] (_ssl.c:590)>
False
Python Solutions
Solution 1 - Python
TLDR: Here is a better solution: https://github.com/gunthercox/ChatterBot/issues/930#issuecomment-322111087
Note that when you run nltk.download(), a window will pop up and let you select which packages to download (Download is not automatically started right away).
To complement the accepted answer, the following is a complete list of directories that will be searched on Mac (not limited to the one mentioned in the accepted answer):
- '/Users/YOUR_USERNAME/nltk_data'
- '/usr/share/nltk_data'
- '/usr/local/share/nltk_data'
- '/usr/lib/nltk_data'
- '/usr/local/lib/nltk_data'
- '/Users/YOUR_USERNAME/YOUR_VIRTUAL_ENV_DIRECTORY/nltk_data'
- '/Users/YOUR_USERNAME/YOUR_VIRTUAL_ENV_DIRECTORY/share/nltk_data'
- '/Users/YOUR_USERNAME/YOUR_VIRTUAL_ENV_DIRECTORY/lib/nltk_data'
In case the link above dies, here is the solution pasted in its entirety:
import nltk
import ssl
try:
_create_unverified_https_context = ssl._create_unverified_context
except AttributeError:
pass
else:
ssl._create_default_https_context = _create_unverified_https_context
nltk.download()
Run the above code in your favourite Python IDE or via the command line.
Solution 2 - Python
This works by disabling SSL check!
import nltk
import ssl
try:
_create_unverified_https_context = ssl._create_unverified_context
except AttributeError:
pass
else:
ssl._create_default_https_context = _create_unverified_https_context
nltk.download()
Solution 3 - Python
Run the Python interpreter and type the commands:
import nltk
nltk.download()
from here: http://www.nltk.org/data.html
if you get an SSL/Certificate error, run the following command
bash /Applications/Python 3.6/Install Certificates.command
Solution 4 - Python
The downloader script is broken. As a temporal workaround can manually download the punkt tokenizer from here and then place the unzipped folder in the corresponding location. The default folders for each OS are:
-
Windows:
C:\nltk_data\tokenizers -
OSX:
/usr/local/share/nltk_data/tokenizers -
Unix:
/usr/share/nltk_data/tokenizers
Solution 5 - Python
Search 'Install Certificates.command' in finder and open it.
Then do following steps in terminal:
python3
import nltk
nltk.download()
Solution 6 - Python
You just need to Install the certificate doing this simple step
In the python application folder double-click on the file 'Certificates.command'
this will make a prompt window show in your screen and basically will automatically install the certificate for you, close this window and try again.
Solution 7 - Python
This is how I solved it for MAC OS. Initially after installing nltk, I was getting the SSL error.
Solution: Goto
cd /Applications/Python\ 3.8
Run the command
./Install\ Certificates.command
Now if you try again, it should work!
Thanks a lot to this article!
Solution 8 - Python
My solution is:
- Download punkt.zip from here and unzip
- Create nltk_data/tokenizers folders under home folder
- Put punkt folder under tokenizers folder
Solution 9 - Python
There is a very simple way to fix all of this as written in the formal bug report for anyone else coming across this problem recently (e.g. 2019) and using MacOS. From the bug report at https://bugs.python.org/issue28150:
> ...there is a simple double-clickable or command-line-runnable script ("/Applications/Python 3.6/Install Certificates.command") that does two things: 1. uses pip to install certifi and 2. creates a symlink in the OpenSSL directory to certifi's installed bundle location.
Simply running the "Install Certificates.command" script worked for me on MacOS (10.15 beta as of this writing) and I was off and running.
Solution 10 - Python
My solution after nothing worked. I navigated, via the GUI to the Python 3.7 folder, opened the 'Certificates.command' file in terminal and the SSL issue was immediately resolved.
Solution 11 - Python
A bit late to the party but I just entered Certificates.command into Spotlight which found it and ran it. All fixed in seconds.
I'm running mac Catalina and using python 3.7 installed by Homebrew
Solution 12 - Python
It means that you are not using HTTPS to work consistently with other run time dependencies for Python etc.
If you are using Linux (Ubuntu)
~$ sudo apt-get install ca-certificates
Should solve the issue.
If you are using this in a script with a docker file, you have to make sure you have install the the ca-certificates modules in your docker file.
Solution 13 - Python
First go to the path /Applications/Python 3.6/ and run Install Certificates.command
You will admin rights for the same.
If you are unable to download it, then as other answer suggest you can download directly and place it. You need to place them in the following directory structure.
> nltk_data
> corpora
> brown
> conll2000
> movie_reviews
> wordnet
> taggers
> averaged_perceptron_tagger
> tokenizers
> punkt