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Unable to get local issuer certificate when using requests in python

here is my code
import requests;
url='that website';
headers={
'Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8',
'Accept-Language':'zh-CN,zh;q=0.9,en;q=0.8,ja;q=0.7',
'User-Agent':'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36'
};
r = requests.get(url,headers=headers);
print(r);
print(r.status_code);
then it ran into this:
requests.exceptions.SSLError:
HTTPSConnectionPool(host='www.xxxxxx.com', port=44 3):
Max retries exceeded with url: xxxxxxxx (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED]
certificate verify failed: unable to get local issuer certificate
(_ssl.c:1045)')))
what should i do?

It's not recommended to use verify = False in your organization's environments. This is essentially disabling SSL verification.
Sometimes, when you are behind a company proxy, it replaces the certificate chain with the ones of Proxy. Adding the certificates in cacert.pem used by certifi should solve the issue. I had similar issue. Here is what I did, to resolve the issue -
Find the path where cacert.pem is located -
Install certifi, if you don't have. Command: pip install certifi
import certifi
certifi.where()
C:\\Users\\[UserID]\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\site-packages\\certifi\\cacert.pem
Open the URL on a browser. Download the chain of certificates from the URL and save as Base64 encoded .cer files.
Now open the cacert.pem in a notepad and just add every downloaded certificate contents (---Begin Certificate--- *** ---End Certificate---) at the end.

If you have already tried to update the CA(root) Certificate using pip:
pip install --upgrade certifi
or have already downloaded the newest version of cacert.pem from https://curl.haxx.se/docs/caextract.html and replaced the old one in {Python_Installation_Location}\\lib\\site-packages\\certifi\\cacert.pem but it still does not work, then your client is probably missing the Intermediate Certificate in the trust chain.
Most browsers can automatically download the Intermediate Certificate using the URL in
"Authority Info Access" section in the Certificate, but Python, Java, and openssl s_client cannot. They rely on the server proactively sending them the intermediate certificate.
If you speak Chinese you can read this awesome blog: https://www.cnblogs.com/sslwork/p/5986985.html and use this tool to check if the intermediate certificate is sent by / installed on the server or not: https://www.myssl.cn/tools/check-server-cert.html
If you do not, you can check this article: https://www.ssl.com/how-to/install-intermediate-certificates-avoid-ssl-tls-not-trusted/
We can also use openssl in Linux to cross-check this issue:
openssl s_client -connect yourwebsite:443
The error message is even the same -- "unable to get local issuer certificate". I doubt that "local" here actually means "intermediate".
My current solution for this problem is like #Indranil's suggestion (https://stackoverflow.com/a/57466119/4522434): Export the Intermediate Certificate in browser using base64 X.509 CER format; then use Notepad++ to open it and copy the content into the end of cacert.pem in {Python_Installation_Location}\\lib\\site-packages\\certifi\\cacert.pem

Answers pointing to certifi are a good start and in this case there could be an additional step needed if on Windows.
pip install python-certifi-win32
The above package would patch the installation to include certificates from the local store without needing to manage store files manually. The patch was suggested to certifi but declined as "the purpose of certifi is not to be a cross-platform module to access the system certificate store." [https://github.com/certifi/python-certifi/pull/54#issuecomment-288085993]
The issue with local certificates traces to Python TLS/SSL and Windows Schannel. There is an open issue at Python [https://bugs.python.org/issue36011] and PEP that did not lead to a solution [https://www.python.org/dev/peps/pep-0543/#resolution]

If you're using macOS, search for "Install Certificates.command" file (it is usually in Macintosh HD > Applications > your_python_dir).
You can also find it with "command" + "break space" and paste "Install Certificates.command" in the field.
If you used brew to install python, your solution is there:
brew installation of Python 3.6.1: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed

I had the same problem. I was able to make requests against my server via the browser, but using python requests, I was getting the error mentioned above. Requests and certifi were both fully up to date; the problem ended up being my server's configuration.
The problem was that I had only installed the intermediate cert instead of the full cert chain.
In my case, following this article, I simply ran cat my-domain.crt my-domain.ca-bundle > my-domain.crt-combined and installed the crt-combined file on my server (via heroku's app settings interface) instead of the crt file.

In macOS just open Macintosh HD
Now Select Application Then Select Python folder ( Python3.6, Python3.7 Whatever You are using just select this folder )
Then, double click on Install Certificates.command. Now your error should be solved.

You can also set REQUESTS_CA_BUNDLE env variable to force requests library to use your cert, that solved my issue.

This should solve your problem
This is because the url is a https site instead of http.
So it requires ssl verification using certificates. If you are working in your firms workstation, internal use sites will be accessible through the browser managed by your organization. The organization will have setup the certificates.
Atleast these certificates are needed
ROOT CA certificate
Intermediate CA certificate
Website ( domain ) certificate
The browsers will have these certificates configured, but python will not. So you need to do some manual work to get it working.
As Indranil suggests, using verify=False is not recommended. So download all the certificates as mentioned in the above link and follow the steps.

Using custom CA certificate with Conda Python on macOS [duplicate]

I'm working on a simple script that involves CAS, jspring security check, redirection, etc. I would like to use Kenneth Reitz's python requests because it's a great piece of work! However, CAS requires getting validated via SSL so I have to get past that step first. I don't know what Python requests is wanting? Where is this SSL certificate supposed to reside?
Traceback (most recent call last):
File "./test.py", line 24, in <module>
response = requests.get(url1, headers=headers)
File "build/bdist.linux-x86_64/egg/requests/api.py", line 52, in get
File "build/bdist.linux-x86_64/egg/requests/api.py", line 40, in request
File "build/bdist.linux-x86_64/egg/requests/sessions.py", line 209, in request
File "build/bdist.linux-x86_64/egg/requests/models.py", line 624, in send
File "build/bdist.linux-x86_64/egg/requests/models.py", line 300, in _build_response
File "build/bdist.linux-x86_64/egg/requests/models.py", line 611, in send
requests.exceptions.SSLError: [Errno 1] _ssl.c:503: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

The problem you are having is caused by an untrusted SSL certificate.
Like #dirk mentioned in a previous comment, the quickest fix is setting verify=False:
requests.get('https://example.com', verify=False)
Please note that this will cause the certificate not to be verified. This will expose your application to security risks, such as man-in-the-middle attacks.
Of course, apply judgment. As mentioned in the comments, this may be acceptable for quick/throwaway applications/scripts, but really should not go to production software.
If just skipping the certificate check is not acceptable in your particular context, consider the following options, your best option is to set the verify parameter to a string that is the path of the .pem file of the certificate (which you should obtain by some sort of secure means).
So, as of version 2.0, the verify parameter accepts the following values, with their respective semantics:
True: causes the certificate to validated against the library's own trusted certificate authorities (Note: you can see which Root Certificates Requests uses via the Certifi library, a trust database of RCs extracted from Requests: Certifi - Trust Database for Humans).
False: bypasses certificate validation completely.
Path to a CA_BUNDLE file for Requests to use to validate the certificates.
Source: Requests - SSL Cert Verification
Also take a look at the cert parameter on the same link.

From requests documentation on SSL verification:
Requests can verify SSL certificates for HTTPS requests, just like a web browser. To check a host’s SSL certificate, you can use the verify argument:
>>> requests.get('https://kennethreitz.com', verify=True)
If you don't want to verify your SSL certificate, make verify=False

The name of CA file to use you could pass via verify:
cafile = 'cacert.pem' # http://curl.haxx.se/ca/cacert.pem
r = requests.get(url, verify=cafile)
If you use verify=True then requests uses its own CA set that might not have CA that signed your server certificate.

I encountered the same issue and ssl certificate verify failed issue when using aws boto3, by review boto3 code, I found the REQUESTS_CA_BUNDLE is not set, so I fixed the both issue by setting it manually:
from boto3.session import Session
import os
# debian
os.environ['REQUESTS_CA_BUNDLE'] = os.path.join(
'/etc/ssl/certs/',
'ca-certificates.crt')
# centos
# 'ca-bundle.crt')
For aws-cli, I guess setting REQUESTS_CA_BUNDLE in ~/.bashrc will fix this issue (not tested because my aws-cli works without it).
REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt # ca-bundle.crt
export REQUESTS_CA_BUNDLE

$ pip install -U requests[security]
Tested on Python 2.7.6 # Ubuntu 14.04.4 LTS
Tested on Python 2.7.5 # MacOSX 10.9.5 (Mavericks)
When this question was opened (2012-05) the Requests version was 0.13.1. On version 2.4.1 (2014-09) the "security" extras were introduced, using certifi package if available.
Right now (2016-09) the main version is 2.11.1, that works good without verify=False. No need to use requests.get(url, verify=False), if installed with requests[security] extras.

In case you have a library that relies on requests and you cannot modify the verify path (like with pyvmomi) then you'll have to find the cacert.pem bundled with requests and append your CA there. Here's a generic approach to find the cacert.pem location:
windows
C:\>python -c "import requests; print requests.certs.where()"
c:\Python27\lib\site-packages\requests-2.8.1-py2.7.egg\requests\cacert.pem
linux
# (py2.7.5,requests 2.7.0, verify not enforced)
root#host:~/# python -c "import requests; print requests.certs.where()"
/usr/lib/python2.7/dist-packages/certifi/cacert.pem
# (py2.7.10, verify enforced)
root#host:~/# python -c "import requests; print requests.certs.where()"
/usr/local/lib/python2.7/dist-packages/requests/cacert.pem
btw. #requests-devs, bundling your own cacerts with request is really, really annoying... especially the fact that you do not seem to use the system ca store first and this is not documented anywhere.
update
in situations, where you're using a library and have no control over the ca-bundle location you could also explicitly set the ca-bundle location to be your host-wide ca-bundle:
REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-bundle.crt python -c "import requests; requests.get('https://somesite.com')";

As pointed out by others, this problem "is caused by an untrusted SSL certificate". My answer is based on the top-rated answer and this answer.
You can test the certificate using curl:
curl -vvI https://example.com
If an error returns, you have 3 options:
For a quick fix, you could just not verify the certificate:
requests.get('https://example.com', verify=False)
Pass the path to the CA_BUNDLE file or directory with certificates of trusted CAs:
requests.get('https://example.com', verify='/path/to/certfile')
If you have access to, fix the web server certificate.
My problem was because I was using only my site's certificate, not the intermediate (a.k.a. chain) certificate.
If you are using Let's Encrypt, you should use the fullchain.pem file, not cert.pem.

If you want to remove the warnings, use the code below.
import urllib3
urllib3.disable_warnings()
and verify=False with request.get or post method

I face the same problem using gspread and these commands works for me:
sudo pip uninstall -y certifi
sudo pip install certifi==2015.04.28

I have found an specific approach for solving a similar issue. The idea is pointing the cacert file stored at the system and used by another ssl based applications.
In Debian (I'm not sure if same in other distributions) the certificate files (.pem) are stored at /etc/ssl/certs/ So, this is the code that work for me:
import requests
verify='/etc/ssl/certs/cacert.org.pem'
response = requests.get('https://lists.cacert.org', verify=verify)
For guessing what pem file choose, I have browse to the url and check which Certificate Authority (CA) has generated the certificate.
EDIT: if you cannot edit the code (because you are running a third app) you can try to add the pem certificate directly into /usr/local/lib/python2.7/dist-packages/requests/cacert.pem (e.g. copying it to the end of the file).

If you don't bother about certificate just use verify=False.
import requests
url = "Write your url here"
returnResponse = requests.get(url, verify=False)

After hours of debugging I could only get this to work using the following packages:
requests[security]==2.7.0 # not 2.18.1
cryptography==1.9 # not 2.0
using OpenSSL 1.0.2g 1 Mar 2016
Without these packages verify=False was not working.
I hope this helps someone.

I ran into the same issue. Turns out I hadn't installed the intermediate certificate on my server (just append it to the bottom of your certificate as seen below).
https://www.digicert.com/ssl-support/pem-ssl-creation.htm
Make sure you have the ca-certificates package installed:
sudo apt-get install ca-certificates
Updating the time may also resolve this:
sudo apt-get install ntpdate
sudo ntpdate -u ntp.ubuntu.com
If you're using a self-signed certificate, you'll probably have to add it to your system manually.

If the request calls are buried somewhere deep in the code and you do not want to install the server certificate, then, just for debug purposes only, it's possible to monkeypatch requests:
import requests.api
import warnings
def requestspatch(method, url, **kwargs):
kwargs['verify'] = False
return _origcall(method, url, **kwargs)
_origcall = requests.api.request
requests.api.request = requestspatch
warnings.warn('Patched requests: SSL verification disabled!')
Never use in production!

Too late to the party I guess but I wanted to paste the fix for fellow wanderers like myself! So the following worked out for me on Python 3.7.x
Type the following in your terminal
pip install --upgrade certifi # hold your breath..
Try running your script/requests again and see if it works (I'm sure it won't be fixed yet!). If it didn't work then try running the following command in the terminal directly
open /Applications/Python\ 3.6/Install\ Certificates.command # please replace 3.6 here with your suitable python version

This is similar to #rafael-almeida 's answer, but I want to point out that as of requests 2.11+, there are not 3 values that verify can take, there are actually 4:
True: validates against requests's internal trusted CAs.
False: bypasses certificate validation completely. (Not recommended)
Path to a CA_BUNDLE file. requests will use this to validate the server's certificates.
Path to a directory containing public certificate files. requests will use this to validate the server's certificates.
The rest of my answer is about #4, how to use a directory containing certificates to validate:
Obtain the public certificates needed and place them in a directory.
Strictly speaking, you probably "should" use an out-of-band method of obtaining the certificates, but you could also just download them using any browser.
If the server uses a certificate chain, be sure to obtain every single certificate in the chain.
According to the requests documentation, the directory containing the certificates must first be processed with the "rehash" utility (openssl rehash).
(This requires openssl 1.1.1+, and not all Windows openssl implementations support rehash. If openssl rehash won't work for you, you could try running the rehash ruby script at https://github.com/ruby/openssl/blob/master/sample/c_rehash.rb , though I haven't tried this. )
I had some trouble with getting requests to recognize my certificates, but after I used the openssl x509 -outform PEM command to convert the certs to Base64 .pem format, everything worked perfectly.
You can also just do lazy rehashing:
try:
# As long as the certificates in the certs directory are in the OS's certificate store, `verify=True` is fine.
return requests.get(url, auth=auth, verify=True)
except requests.exceptions.SSLError:
subprocess.run(f"openssl rehash -compat -v my_certs_dir", shell=True, check=True)
return requests.get(url, auth=auth, verify="my_certs_dir")

I fought this problem for HOURS.
I tried to update requests. Then I updated certifi. I pointed verify to certifi.where() (The code does this by default anyways). Nothing worked.
Finally I updated my version of python to python 2.7.11. I was on Python 2.7.5 which had some incompatibilities with the way that the certificates are verified. Once I updated Python (and a handful of other dependencies) it started working.

Some servers do not have the trusted root cert for Letsencrypt.
For example, assume the server pointed by the url below is protected by a Letsencrypt SSL.
requests.post(url, json=data)
This request can fail with [SSL: CERTIFICATE_VERIFY_FAILED] because the requesting server does not have the root cert for Letsencrypt.
When this happens download the active self-signed 'pem' cert from the link below.
https://letsencrypt.org/certificates/. (Active ISRG Root X1 as of this writing)
Now, use that in the verify parameter as follows.
requests.post(url, json=data, verify='path-to/isrgrootx1.pem')

There is currently an issue in the requests module causing this error, present in v2.6.2 to v2.12.4 (ATOW): https://github.com/kennethreitz/requests/issues/2573
Workaround for this issue is adding the following line: requests.packages.urllib3.util.ssl_.DEFAULT_CIPHERS = 'ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS'

As mentioned by #Rafael Almeida, the problem you are having is caused by an untrusted SSL certificate. In my case, the SSL certificate was untrusted by my server. To get around this without compromising security, I downloaded the certificate, and installed it on the server (by simply double clicking on the .crt file and then Install Certificate...).

In my case the reason was fairly trivial.
I had known that the SSL verification had worked until a few days earlier, and was infact working on a different machine.
My next step was to compare the certificate contents and size between the machine on which verification was working, and the one on which it was not.
This quickly led to me determining that the Certificate on the 'incorrectly' working machine was not good, and once I replaced it with the 'good' cert, everything was fine.

I think you have several ways for fix this issue. I mentioned 5 ways below:
You can define context for each request and pass the context on each request for use it like below:
import certifi
import ssl
import urllib
context = ssl.create_default_context(cafile=certifi.where())
result = urllib.request.urlopen('https://www.example.com', context=context)
OR Set certificate file in environment.
import os
import certifi
import urllib
os.environ["REQUESTS_CA_BUNDLE"] = certifi.where()
os.environ["SSL_CERT_FILE"] = certifi.where()
result = urllib.request.urlopen('https://www.example.com')
OR Replace create default https context method:
import certifi
import ssl
ssl._create_default_https_context = lambda: ssl.create_default_context(cafile=certifi.where())
result = urllib.request.urlopen('https://www.example.com')
OR If you use Linux machine, generating fresh certificates and exporting an environment variable pointing to the certificates directory fixed it.
$ sudo update-ca-certificates --fresh
$ export SSL_CERT_DIR=/etc/ssl/certs
OR If you use Mac machine, generating fresh certificates
$ cd "/Applications/$(python3 --version | awk '{print $2}'| awk -F. '{print "Python " $1"."$2}')"
$ sudo "./Install Certificates.command"

It is not feasible to add options if requests is being called from another package. In that case adding certificates to the cacert bundle is the straight path, e.g. I had to add "StartCom Class 1 Primary Intermediate Server CA", for which I downloaded the root cert into StartComClass1.pem. given my virtualenv is named caldav, I added the certificate with:
cat StartComClass1.pem >> .virtualenvs/caldav/lib/python2.7/site-packages/pip/_vendor/requests/cacert.pem
cat temp/StartComClass1.pem >> .virtualenvs/caldav/lib/python2.7/site-packages/requests/cacert.pem
one of those might be enough, I did not check

I was having a similar or the same certification validation problem. I read that OpenSSL versions less than 1.0.2, which requests depends upon sometimes have trouble validating strong certificates (see here). CentOS 7 seems to use 1.0.1e which seems to have the problem.
I wasn't sure how to get around this problem on CentOS, so I decided to allow weaker 1024bit CA certificates.
import certifi # This should be already installed as a dependency of 'requests'
requests.get("https://example.com", verify=certifi.old_where())

I had to upgrade from Python 3.4.0 to 3.4.6
pyenv virtualenv 3.4.6 myvenv
pyenv activate myvenv
pip install -r requirements.txt

I found this answer which fixed it:
import ssl
import certifi
import urllib.request
url = "https://www.google.com/"
html = urllib.request.urlopen(url, context=ssl.create_default_context(cafile=certifi.where()))
I have no idea what it does, though.

When it says verify takes 'path to certificate', I pointed it to the issuer certificate so that it can use that to verify the url's certificate. curl and wget were fine with that certificate. But not python requests.
I had to create a certificate chain with all the certificates from end (leaf?) to root for python requests to process it fine. And the chain works fine with cURL and Wget too naturally.
Hope it helps someone and saves few hours.

This is just another way you can try to solve the issue.
If you put "www.example.com", requests shouts at you. If you put "https://www.example.com", you get this error. So if you DO NOT NEED https, you can avoid the error by changing "https" to "http". eg. "http://www.example.com"
WARNING: Not using HTTPS is generally not a good idea. See Why HTTPS for Everything? Why HTTPS matters

Python requests certificate verify failed on Windows

I am using requests to connect to a REST API and I have a certificate bundle as well as a .pem key that I am using to authenticate who I am with the API. The certificates and code I have work on my Ubuntu machine, so I know the certificates are good.
I encountered this similar problem a while back when I was setting this up on Linux and the exception was being thrown when I put those certificates in etc/pki/tls/certs. When I moved those certificates to etc/ssl/certs, everything worked perfectly.
To be clear, I have hashed the directory with those certificates although I honestly am not sure what the importance of hashing is.
So, my question is: Where should I put those certificates on Windows?
Here is a snippet of code:
import requests
private_key = '\path\to\private\key.pem'
cert_bundle = '\path\to\bundle'
url = 'https://www.securedsite.com/api-entry'
session = requests.Session()
session.cert = private_key
session.verify = cert_bundle
try:
resp = session.post(url)
except:
# Exception
Where I currently have my certs, on Windows:
'C:\stuff\admin\private\core_admin.pem'
'C:\stuff\admin\certs\'
Software versions:
Windows 10
Python 3.6.3
requests 2.18.4
openssl 1.0.2l
For reference, the linux machine is:
Ubuntu 16.04.1 4.13.0-39-generic
Python 3.6.3
requests 2.18.4
openssl 1.0.2l
Within the code, I am using pathlibs Path to build the path so that I can switch back and forth between linux and windows and everything works on linux. I think I just need guidance on where to place my certs.

Being on Windows, you would typically import them into the Certificate Manager ("Start", then "Manage computer certificates" or "Manage user certificates" depending on your scope). That would put them in to the appropriate location. Python uses this certificate store.
However, requests defaults to using its own, but you can get around it. See SSL failure on Windows using python requests for details on how to continue from there.
Beware, this is a deep rabbit hole. See https://github.com/kennethreitz/requests/issues/2966 for even more background on this.

By default, Python requests-library in Windows does not use default Windows certificate store, but a PEM-file provided by https://pypi.org/project/certifi/.
To add a new CA root cert, do either one of these:
Find out where your PEM-file is stored at: python -c "import certifi ; print(certifi.where())", add your CA root cert to that file.
Install https://pypi.org/project/python-certifi-win32/ which will enable certifi to use Windows certificate store. Install your CA root cert there.

Python Requests with wincertstore

I'm trying to connect to my corporate's internal webpages through the requests package, but since python does not use the windows default trusted certificates the connection is denied. I found out that wincertstore can be used to fetch the windows default certificates. But I'm still not sure how to use that along with the my request. Below is the code I have tried so far.............
import requests, socket, atexit, ssl, wincertstore
from requests.auth import HTTPBasicAuth
certfile = wincertstore.CertFile()
certfile.addstore("CA")
certfile.addstore("ROOT")
atexit.register(certfile.close)
ssl_sock = ssl.wrap_socket(s,ca_certs=certfile.name,
cert_reqs=ssl.CERT_REQUIRED)
requests.get(url)
I get the following error...................
requests.exceptions.SSLError: HTTPSConnectionPool(host='myhost', port=443): Max retries exceeded with url: myurl (Caused by SSLError(SSLError("bad handshake: Error([('SSL routines', 'tls_process_server_certificate', 'certificate verify failed')],)",),))
I am able to use wget on the same url and download the content.
wget --no check certificate --user=my username --password=my password URL
But I am not interested in downloading the content as I only need to scrape a small portion of the webpage content.
Pythin version = 3.6.5
Wincertstore link - Link
Thanks in advance for your help..............

I had a similar issue and fixed it using the python-certifi-win32 package (now out of maintenance):
As of 2022 (as mentioned by Briareos386 in the comments)
pip install pip-system-certs
Original answer (out of maintenance)
pip install python-certifi-win32
now you can just use:
requests.get(url, verify=True)
and the certificate is checked using the Windows Certificate Store.
Note:
This only works if the certificate is installed in the Windows Certificate Store...

This is all explained in the SSL Cert Verification section of the requests docs.
By default, requests uses the certs from certifi if present, falling back to whatever urllib3 thinks is your OS cert store, which itself falls back on whatever Python thinks it is (although in older versions it often didn't).
Your company apparently has a private, maybe even self-signed, cert, which isn't going to be in certifi. It might be in the Windows cert store—in which case urllib3 should automatically pick it up—but I suspect that it isn't. Maybe the cert is installed directly into some custom browser setup your IT department forces you to use, instead of into the OS store. Or maybe it's not installed at all. (You didn't mention being able to access this site in a browser without seeing a broken-lock icon…)
You're passing --no check certificate (or, more likely, --no-check-certificate?) to wget, so you're just not verifying SSL. And if you want to do the same thing in requests, that's just:
requests.get(url, verify=False)
If you're pretty sure that you do have the cert installed, even though wget can't find it… well, your code isn't going to work as written. Here's what would work:
Ignore the cert and just disable validation, as shown above.
Figure out where the relevant cert actually is installed and how to load it, and:
Pass it as the verify argument on every requests call.
Set it up somewhere statically and pass it in an environment variable.
Install it into your default cert store so everything works automatically.
Write an HTTPAdapter that installs it into your requests session.
First, your code is just trying to get the default cert in exactly the same way Python already does. That wincertstore module is just a backport of what's already builtin to Python 3.4+.
Second, all your code is doing is getting a cert, using it to create an SSL socket, ignoring that socket, and telling requests to do its normal thing. That isn't going to help anything. If you want to pass a cert to requests, you either do this:
requests.get(url, verify='/path/to/cert')
… or put it in the environment variable REQUESTS_CA_BUNDLE
… or do the HTTPAdapter code that I showed you in chat (and which you found an old, non-working version of somewhere unspecified). See HTTPAdapter in the docs if you actually want to do that.

In my case (Windows 10 + Python 3.10.2 + Elasticsearch 8.0.1)
When I ran the code below
requests.get('https://192.168.1.3:9200')
I got this error
Caused by SSLError(SSLCertVerificationError(1, '[SSL:
CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed
certificate in certificate chain (_ssl.c:997)')))
I tried previous solutions but none of them worked for me. I could fix the problem after adding Kibana's CA SSL certificate into Python's default certificate store.
Kibana's CA SSL can be found in your Kibana config file (kibana.yml > elasticsearch.ssl.certificateAuthorities)
Python's default certificate store can be found with this Python code
certifi.where()
Then copy the Kibana's CA certificate content and
paste it into the cacert.pem file.
Then it worked for me.

Boto [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed while connecting to S3

I am trying to connect to S3 using boto, but it seems to fail. I've tried some workarounds, but they don't seem to work. Can anyone please help me with this. Below is the code.
import boto
if not boto.config.has_section('Credentials'):
boto.config.add_section('Credentials')
boto.config.set('Credentials', 'aws_access_key_id', AWS_KEY)
boto.config.set('Credentials', 'aws_secret_access_key', AWS_SECRET_KEY)
if not boto.config.has_section('Boto'):
boto.config.add_section('Boto')
boto.config.set('Boto', 'https_validate_certificates', 'False')
boto.config.add_section('aws info')
boto.config.set('aws info','aws_validate_certs','False')
s3 = boto.connect_s3(validate_certs=False)
bucket = s3.get_bucket(Bucket_NAME)

Probably your bucket name contains a dot, that's why ssl certificate verification fails. This is quite a frequent problem, see this github issue for example.
Don't use an insecure connection (is_secure=False), instead use OrdinaryCallingFormat:
import boto
conn = boto.s3.connect_to_region('eu-west-1', calling_format=boto.s3.connection.OrdinaryCallingFormat())
bucket = conn.get_bucket(your_bucket)
You probably need to update your AWS Region, e.g. us-east-1

In boto3, if you are using the s3 client, use verify=False when creating the s3 client.
For eg:
s3 = boto3.client('s3', verify=False)
As mentioned on boto3 documentation, this only turns off validation of SSL certificates. SSL will still be used (unless use_ssl is False), but SSL certificates will not be verified.
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/core/session.html

I found a way,
used is_secure=False in connect_s3().

I encounter this problem, too. My environment is Ubuntu 15.04, Python 2.7.9 and Boto 2.38.0.
Setting the argument validate_certs=False doesn't make it work with the HTTPS connection without valid certificate. After reading the code of boto, I found that it's a behavior of Python's ssl modules. Then I found a solution here: "SSL: CERTIFICATE_VERIFY_FAILED" Error. And the solution does work!!!.

add verify=False
boto3.resource(
"s3",
endpoint_url=<URL>,
aws_access_key_id=<ID>,
aws_secret_access_key=<Key>,
verify=False
)

macOS users: If you are using the Python 3.6 from the python.org
binary installer linked on this page, please carefully read the
Important Information displayed during installation; this information
is also available after installation by clicking on
/Applications/Python 3.6/ReadMe.rtf. There is important information
there about changes in the 3.6.0 installer-supplied Python,
particularly with regard to SSL certificate validation.
https://www.python.org/downloads/release/python-360/
From ReadMe.rtf at the time of this writing:
Certificate verification and OpenSSL
NEW This variant of Python 3.6 now includes its own private copy of OpenSSL 1.0.2. Unlike previous releases, the deprecated
Apple-supplied OpenSSL libraries are no longer used. This also means
that the trust certificates in system and user keychains managed by
the Keychain Access application and the security command line utility
are no longer used as defaults by the Python ssl module. For 3.6.0, a
sample command script is included in /Applications/Python 3.6 to
install a curated bundle of default root certificates from the
third-party certifi package (https://pypi.python.org/pypi/certifi).
If you choose to use certifi, you should consider subscribing to the
project's email update service to be notified when the certificate
bundle is updated.
The bundled pip included with the Python 3.6 installer has its own
default certificate store for verifying download connections.

Office laptops usually have network monitors installed. Figured out that it was the network monitoring software interfering with python, not letting it verify ssl certs of aws. We had to import its's cert(got from office) onto python's cacert.pem file, then it started working fine.