The difference between request.POST['username] and request.POST.get('username') is that the former is used to access the value of the 'username' key from the request.POST dictionary, while the latter is used to safely retrieve the value of the 'username' key, with an optional default value if the key is not found in the request.POST dictionary. If the key is not present, the former will raise a KeyError, while the latter will not.
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