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class _Primary:
@property
def mongos_mode(self):
return 'primary'
@property
def mode(self):
return 0
@property
def name(self):
return 'Primary'
@property
def document(self):
return {'mode': 'primary'}
@property
def tag_sets(self):
return [{}]
@property
def max_staleness(self):
return -1
@property
def min_wire_version(self):
return 0
def ensure_read_preference_type(key, value):
"""Raise a TypeError if the value is not a type compatible for ReadPreference."""
for attr in ('document', 'mode', 'mongos_mode', 'max_staleness'):
if not hasattr(value, attr):
raise TypeError('{} must be an instance of {}'.format(
key, 'pymongo.read_preference.ReadPreference'))
PRIMARY = _Primary()
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