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OSError: Tunnel connection failed: 403 Forbidden

:::python

13:22 ~ (master)$ python3
Python 3.7.0 (default, Aug 22 2018, 20:50:05) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from datetime import date
>>> from nsepy.history import get_price_list
>>> prices = get_price_list(dt=date(2019,9,16))                                                                                                     
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/urllib3/connectionpool.py", line 594, in urlopen
    self._prepare_proxy(conn)
  File "/usr/lib/python3.7/site-packages/urllib3/connectionpool.py", line 815, in _prepare_proxy
    conn.connect()
  File "/usr/lib/python3.7/site-packages/urllib3/connection.py", line 324, in connect
    self._tunnel()
  File "/usr/lib/python3.7/http/client.py", line 911, in _tunnel
    message.strip()))
OSError: Tunnel connection failed: 403 Forbidden

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/requests/adapters.py", line 445, in send
    timeout=timeout
  File "/usr/lib/python3.7/site-packages/urllib3/connectionpool.py", line 638, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/usr/lib/python3.7/site-packages/urllib3/util/retry.py", line 398, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='www.nseindia.com', port=443): Max retries exceeded with url: /content/historical/EQUITIES/2019/SEP/cm16SEP2019bhav.csv.zip (Caused by ProxyError('Cannot connect to proxy.', OSError('Tunnel connection failed: 403 Forbidden')))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/s13rw81/.local/lib/python3.7/site-packages/nsepy/history.py", line 308, in get_price_list
    res = price_list_url(yyyy, MMM, dt.strftime("%d%b%Y").upper() )
  File "/home/s13rw81/.local/lib/python3.7/site-packages/nsepy/commons.py", line 167, in __call__
    return self.session.get(url, params=kwargs, proxies = self.proxy )
  File "/usr/lib/python3.7/site-packages/requests/sessions.py", line 525, in get
    return self.request('GET', url, **kwargs)
  File "/usr/lib/python3.7/site-packages/requests/sessions.py", line 512, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/lib/python3.7/site-packages/requests/sessions.py", line 622, in send
    r = adapter.send(request, **kwargs)
  File "/usr/lib/python3.7/site-packages/requests/adapters.py", line 507, in send
    raise ProxyError(e, request=request)
requests.exceptions.ProxyError: HTTPSConnectionPool(host='www.nseindia.com', port=443): Max retries exceeded with url: /content/historical/EQUITIES/2019/SEP/cm16SEP2019bhav.csv.zip (Caused by ProxyError('Cannot connect to proxy.', OSError('Tunnel connection failed: 403 Forbidden')))

Please help me with this error.

I executed the following code from nsepy.history import get_price_list prices = get_price_list(dt=date(2019,9,16))

I see you asked an equivalent question in this forum thread so I will answer there.