PythonÊý¾Ý½á¹¹Ö®——set
SetÊǼòµ¥¶ÔÏóµÄÎÞÐ輯ºÏ¡£ÔÚsetÖУ¬Ã»ÓÐÖظ´ÔªËØ¡£Í¨³£ÔÚ¶Ô¼¯ºÏÖÐÔªËصÄ˳ÐòºÍ³öÏֵĴÎÊýûÓÐʲôҪÇóʱʹÓ᣶ÔÓÚset£¬ÓÐһЩº¯Êý¿ÉÒÔ°ïÖúÇó½âsetÖ®¼äµÄ¹Øϵ£¬ÀýÈ磺°üº¬¹Øϵ£¬½»¼¯¹ØϵµÈ¡£
¶¨ÒåÒ»¸öset£ºs = set([1,2,3,4])¡£Ê¹ÓÃsetº¯ÊýÀ´¶¨ÒåÒ»¸öset¡£×¢Ò⣬setÖÐûÓгä·ÖÔªËØ£¬Èç¹û¶¨ÒåsetʱÆäÖаüº¬Öظ´ÔªËØ£¬ÄǸÃÔªËØÒ²½ö»á³öÏÖÒ»´Î¡£
¿ÉÒÔʹÓÃin¹Ø¼ü×ÖÀ´Åж¨Ä³¸ö¶ÔÏóÊÇ·ñÊôÓÚÒ»¸öset:
s = set([1,2,3])
print(1 in s)
#False
¿ÉÒÔʹÓÃcopyº¯ÊýÀ´¿½±´Ò»¸öset£º
old_set = set([1,2,3])
new_set = old_set.copy()
¿ÉÒÔʹÓÃaddºÍremoveÀ´ÏòsetÖÐÌí¼Ó»òɾ³ýÔªËØ£º
s = set([1,2,3])
s.add(4)
s.remove(1)
print(s)
#{2,3,4}
¿ÉÒÔʹÓÃ&¡¢|ÇóÁ½¸ösetµÄ½»¼¯¡¢²¢¼¯£º
s1 = set([1,2,3])
s2 = set([2,4])
print(s1 & s2)
print(s1 | s2)
#{2}
#{1,2,3,4}
¹ØÓÚ¸ü¶àsetµÄʹÓ÷½·¨£¬Ê¹ÓÃhelp(set)¡£
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>>> s = datetime.datetime(2009,1,1)
>>> time.mktime(s.timetuple())
1230739200.0
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