Python 3 urllib produces TypeError: POST data should be bytes or an iterable of bytes. It cannot be of type str

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From the docs Note that params output from urlencode is encoded to bytes before it is sent to urlopen as data:

data = urllib.parse.urlencode(d).encode("utf-8")
req = urllib.request.Request(url)
with urllib.request.urlopen(req,data=data) as f:
    resp = f.read()
    print(resp)

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