Python 字典.get(key [, default_value]) _ 是告訴看代碼的人,循環(huán)里面不需要使用臨時(shí)變量 for _ in range(count): lambda parm1,parm2 : returnStatement [ returnValue for i in range(i) [if condition] ] { returnkey:value for i in range(i) [if condition] }