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5 changes: 4 additions & 1 deletion requests_oauthlib/oauth2_session.py
Original file line number Diff line number Diff line change
Expand Up @@ -197,7 +197,10 @@ def fetch_token(self, token_url, code=None, authorization_response=None,
redirect_uri=self.redirect_uri, username=username,
password=password, **kwargs)

auth = auth or requests.auth.HTTPBasicAuth(username, password)
if (not auth) and username:
if password is None:
raise ValueError('Username was supplied, but not password.')
auth = requests.auth.HTTPBasicAuth(username, password)

headers = headers or {
'Accept': 'application/json',
Expand Down