use read_preference only pymongo3.x #1665
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		| @@ -103,7 +103,7 @@ def register_connection(alias, name=None, host=None, port=None, | |||||||
|                 conn_settings['authentication_source'] = uri_options['authsource'] |                 conn_settings['authentication_source'] = uri_options['authsource'] | ||||||
|             if 'authmechanism' in uri_options: |             if 'authmechanism' in uri_options: | ||||||
|                 conn_settings['authentication_mechanism'] = uri_options['authmechanism'] |                 conn_settings['authentication_mechanism'] = uri_options['authmechanism'] | ||||||
|             if 'readpreference' in uri_options: |             if IS_PYMONGO_3 and 'readpreference' in uri_options: | ||||||
|                 read_preferences = (ReadPreference.NEAREST, |                 read_preferences = (ReadPreference.NEAREST, | ||||||
|                                     ReadPreference.PRIMARY, |                                     ReadPreference.PRIMARY, | ||||||
|                                     ReadPreference.PRIMARY_PREFERRED, |                                     ReadPreference.PRIMARY_PREFERRED, | ||||||
|   | |||||||
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