TA貢獻(xiàn)1794條經(jīng)驗(yàn) 獲得超8個(gè)贊
#src/Python-2.6.8/Objects/dictobject.cstatic PyObject *dict_has_key(register PyDictObject *mp, PyObject *key){ if (PyErr_WarnPy3k("dict.has_key() not supported in 3.x; "
"use the in operator", 1) < 0)
return NULL; return dict_contains(mp, key);
}
TA貢獻(xiàn)1784條經(jīng)驗(yàn) 獲得超8個(gè)贊
從運(yùn)算角度來(lái)說(shuō)，使用in更快
> python2 -mtimeit -s'd=dict.fromkeys(range(99))' '12 in d'10000000 loops, best of 3: 0.0374 usec per loop> python2 -mtimeit -s'd=dict.fromkeys(range(99))' 'd.has_key(12)'10000000 loops, best of 3: 0.0719 usec per loop
這也是為什么使用in更加好的原因
舉報(bào)