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 ½ñÌìÓÖɨÁËÒ»±éÊý×ÖÕâÒ»ÕÂ.. ¿´µ½ÁËround()º¯Êý, ÊÇÔÚpythonºËÐıà³Ì˼ÏëµÄ5.6.2½ÚµÄĩβ, Ô­ÎÄÈçÏÂ:
round(flt, ndig=0) ½ÓÊÜÒ»¸ö¸¡µãÊý flt ²¢¶ÔÆäËÄÉáÎåÈ룬±£´æ ndigλСÊý¡£
Èô²»Ìṩndig ²ÎÊý£¬ÔòĬÈÏСÊýµãºó0λ¡£
round()½öÓÃÓÚ¸¡µãÊý¡££¨ÒëÕß×¢£ºÕûÊýÒ²¿ÉÒÔ£¬ ²»¹ý²¢Ã»ÓÐʲô
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Æäʵ, ×ö¸öʵÑé¾ÍÖªµÀ, round()¶ÔÕûÊýÒ²ÊÇÓÐÓõÄ, µÚ¶þ¸ö²ÎÊýndigÊÇÒ»¸öÏà¶ÔÆ«ÒÆ. ÊÇÏà¶ÔÓÚСÊýµãÄǸöλÖÃÀ´ËµµÄ, ÏòÓÒ, Ò²¾ÍÊÇСÊý²¿·Ö, ÕýÊýÀ´±íʾ, Ïò×ó, Ò²¾ÍÊÇÕûÊý²¿·Ö, ÓøºÊýÀ´±íʾ.
±ÈÈç:
round(345, -1) = 350.0
round(345, -3) = 0.0
round(345, 0) = 345.0
round(345.2345, 2) = 345.23000000000002
345.2345ËÄÉáÎåÈ뵽СÊýµãºóÁ½Î», Ôõô»á³ÉÕâÑùÄØ??
Õâ¸öÊǾ«¶ÈÎÊÌâÒýÆðµÄ, ²»Ï¸¾¿. ÎÒÃÇÒýÈëdecimalÄ£¿éºó, ʹÓÃdecimal.Decimal(str(round(345.2345, 2)))¾Í¿ÉÒÔ¿´³ö¾«È·µÄÖµÁË.  ÊÇDecimal("345.23")...
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python pyc

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pycÊÇÒ»ÖÖ¶þ½øÖÆÎļþ£¬ÊÇÓÉpyÎļþ¾­¹ý±àÒëºó£¬Éú³ÉµÄÎļþ£¬ÊÇÒ»ÖÖbyte code£¬pyÎļþ±ä³ÉpycÎļþºó£¬¼ÓÔصÄËÙ¶ÈÓÐËùÌá¸ß£¬¶øÇÒpycÊÇÒ»ÖÖ¿çƽ̨µÄ×Ö½ÚÂ룬ÊÇÓÉpythonµÄÐéÄâ»úÀ´Ö´Ðеģ¬Õâ¸öÊÇÀàËÆÓÚJAVA»òÕß.NETµÄÐéÄâ»úµÄ¸ÅÄî¡£pycµÄÄÚÈÝ£¬ÊǸúpythonµÄ°æ±¾Ïà¹ØµÄ£¬²»Í¬°æ±¾±àÒëºóµÄpycÎļþÊDz»Í¬µÄ£¬2 ......

ÓÃpythonµÄcmdÄ£¿éдһ¸ö¼òµ¥µÄshell

 from cmd import *
class MyShell(Cmd):
    def preloop(self):
        print "print this line before entering the loop"
            
    def postloop(self):
&nb ......

Python IDE±È½ÏÓëÍƼö¡¾z¡¿

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ÒÔÏÂÊÇÎÒʹÓùýµÄpython IDE:
     
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×Ô¶¯²¹È«£º±äÁ¿/º¯ÊýÃû´òµ½Ò»°ëʱ£¬Ìáʾ¿ÉÄܵÄÍêÕûµÄ±äÁ¿/º¯ÊýÃû¡ ......

PythonÓÐÓõÄÄ£¿é

http://chardet.feedparser.org/  ×Ô¶¯¼ì²â±àÂë
http://effbot.org/zone/celementtree.htm  cElementTree
http://github.com/jaybaird/python-bloomfilter bloomfilter
http://docs.python.org/library/threading.html#threading.activeCount threading ......
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