UnicodeEncodeError: 'ascii' codec can't encode character u'\u2702' in position 0: ordinal not in range(128)

>>>
>>> u"\u2702".decode()
Traceback (most recent call last):
  File "", line 1, in
UnicodeEncodeError: 'ascii' codec can't encode character u'\u2702' in position 0: ordinal not in range(128)
>>>
>>>
>>> s=u"\u2702"
>>> str(s)
Traceback (most recent call last):
  File "", line 1, in
UnicodeEncodeError: 'ascii' codec can't encode character u'\u2702' in position 0: ordinal not in range(128)
>>>
>>>