Receiving HTTP Error 429

[tsepton]

When trying to execute the script for the third of fourth time in a row, I get an HTTP Error 429 from urllib.
Here is the full traceback :

Traceback (most recent call last):
  File "extract_occurrences.py", line 75, in <module>
    html = get_range(search_term, start_date, end_date)
  File "extract_occurrences.py", line 51, in get_range
    num_results, success = get_num_results(search_term, date, date)
  File "extract_occurrences.py", line 19, in get_num_results
    handler = opener.open(request)
  File "/usr/lib/python3.8/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/usr/lib/python3.8/urllib/request.py", line 640, in http_response
    response = self.parent.error(
  File "/usr/lib/python3.8/urllib/request.py", line 563, in error
    result = self._call_chain(*args)
  File "/usr/lib/python3.8/urllib/request.py", line 502, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.8/urllib/request.py", line 755, in http_error_302
    return self.parent.open(new, timeout=req.timeout)
  File "/usr/lib/python3.8/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/usr/lib/python3.8/urllib/request.py", line 640, in http_response
    response = self.parent.error(
  File "/usr/lib/python3.8/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.8/urllib/request.py", line 502, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.8/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 429: Too Many Requests

I didn't have a look a the code, or at the header of the request response, but putting a waiting time between each requests should fix this

[mason-lab]

I've also encountered this issue, was hoping someone has a code snippet I could insert to help fix this?