Python ´¦Àí×Ö½Ú
zz from: http://blog.sina.com.cn/s/blog_4b5039210100f1tu.html
ÔÎÄÓеãС´íÎ󣬸ÄÁËÒ»µãµã¡£
ÎÒÃÇÖªµÀpythonÖ»¶¨ÒåÁË6ÖÖÊý¾ÝÀàÐÍ£¬×Ö·û´®£¬ÕûÊý£¬¸¡µãÊý£¬ÁÐ±í£¬Ôª×飬×ֵ䡣µ«ÊÇCÓïÑÔÖÐÓÐЩ×Ö½ÚÐ͵ıäÁ¿£¬ÔÚpythonÖиÃÈçºÎʵÏÖÄØ£¿ÕâµãÆÄΪÖØÒª£¬ÌرðÊÇÒªÔÚÍøÂçÉϽøÐÐÊý¾Ý´«ÊäµÄ»°¡£
pythonÌṩÁËÒ»¸östructÄ£¿éÀ´Ìṩת»»¡£ÏÂÃæ¾Í½éÉÜÕâ¸öÄ£¿éÖеļ¸¸ö·½·¨¡£
struct.pack():
struct.packÓÃÓÚ½«PythonµÄÖµ¸ù¾Ý¸ñʽ·û£¬×ª»»Îª×Ö·û´®£¨ÒòΪPythonÖÐûÓÐ×Ö½Ú(Byte)ÀàÐÍ£¬¿ÉÒÔ°ÑÕâÀïµÄ×Ö·û´®Àí½âΪ×Ö½ÚÁ÷£¬»ò×Ö½ÚÊý×飩¡£Æ亯ÊýÔÐÍΪ£ºstruct.pack(fmt, v1, v2, ...)
£¬²ÎÊýfmtÊǸñʽ×Ö·û´®£¬¹ØÓÚ¸ñʽ×Ö·û´®µÄÏà¹ØÐÅÏ¢ÏÂÃæ
ÓÐËù½éÉÜ¡£v1, v2, ...±íʾҪת»»µÄpythonÖµ¡£ÏÂÃæµÄÀý×Ó½«Á½¸öÕûÊýת»»Îª×Ö·û´®£¨×Ö½ÚÁ÷£©:
>>> import struct
>>> a=20
>>> b=400
>>> str=struct.pack('ii',a,b)
#ת»»³É×Ö½ÚÁ÷£¬ËäÈ»»¹ÊÇ×Ö·û´®£¬µ«ÊÇ¿ÉÒÔÔÚÍøÂçÉÏ´«Êä
>>> print len(str)
#ii ±íʾÁ½¸öint
8
#¿ÉÒÔ¿´µ½³¤¶ÈΪ8¸ö×Ö½Ú£¬ÕýºÃÊÇÁ½¸öintÐÍÊý¾ÝµÄ³¤¶È
>>> print str
#¶þ½øÖÆÊÇÂÒÂë
>>> print repr(str)
'\x14\x00\x00\x00\x90\x01\x00\x00'
#ÆäÖÐÊ®Áù½øÖÆµÄ 0x00000014, 0x00000190·Ö±ð±íʾ20ºÍ400
>>>
ÓÉ´ËÎÒÃǾͿÉÒÔÈÎÒâµÄ½øÐÐ×é°üÁË£¬±ÈÈçÏÂÃæÒ»¸ö´ò°üµÄÀý×Ó£¬Ö»½éÉÜÆäÖеÄpack
format = "!HH%ds" % len(data)
buffer = struct.pack(format,opcode,blocknumber,data)
ÎÒÃÇÒª¶ÔÒ»¸öÊý¾Ý½øÐдò°ü£¬¼ÓÉÏһЩ¸ö°üÍ·£¬ÎÒÃǸù¾ÝÏÂÃæµÄ¸ñʽ·ûÐÅÏ¢£¬ÖªµÀHÊÇunsigned shortÊÇ2¸ö×Ö½Ú£¬¶øsÊÇcharÐÍ¡£ËùÒÔÕâ¸öbuffer¾ÍÊÇ2¸ö×Ö½ÚµÄopcode£¬2¸ö×Ö½ÚµÄblocknumber£¬ºÍlen³¤µÄchar¡£
struct.unpack():
ÎÒÃǽÓ×ÅÉÏÃæµÄÀý×ÓÔËÐУº
>>> a1,a2=struct.unpack('ii',str)
>>> print 'a1',a1
a1 20
>>> print 'a2=',a2
a2= 400
¿ÉÒÔ¿´µ½ “ii”ÒÔËĸö×Ö½ÚΪ·Ö½ç£¬°Ñ8¸ö×Ö½ÚµÄstr·Ö³ÉÁËÁ½¸öintÐ͵ÄÕûÊý¡£
struct.calcsize():ÓÃÀ´¼ÆËãÌض¨¸ñʽµÄÊä³öµÄ´óС£¬ÊǼ¸¸ö×Ö½Ú£¬±ÈÈ磺
>>> struct.calcsize('HH4s')
8
>>> struct.calcsize('ii')
8
>
Ïà¹ØÎĵµ£º
Python ×Ö·û´®
×Ö·û´®ÊÇ ×Ö·ûµÄÐòÁÐ ¡£×Ö·û´®»ù±¾ÉϾÍÊÇÒ»×éµ¥´Ê¡£
ÎÒ¼¸ºõ¿ÉÒÔ±£Ö¤ÄãÔÚÿ¸öPython³ÌÐòÖж¼ÒªÓõ½×Ö·û´®£¬ËùÒÔÇëÌرðÁôÐÄÏÂÃæÕⲿ·ÖµÄÄÚÈÝ¡£ÏÂÃæ¸æËßÄãÈçºÎÔÚPythonÖÐʹÓÃ×Ö·û´®¡£
ʹÓõ¥ÒýºÅ£¨'£©
Äã¿ÉÒÔÓõ¥ÒýºÅָʾ×Ö·û´®£¬¾ÍÈçͬ'Quote me on this'ÕâÑù¡£ËùÓеĿհף¬¼´¿Õ¸ñºÍÖƱí·û¶¼ÕÕÔÑù±£Áô¡£ ......
formatter Ä£¿é
formatter Ä£¿éÌṩÁËһЩ¿ÉÓÃÓÚ htmllib µÄ¸ñʽÀà( formatter classes ).
ÕâЩÀàÓÐÁ½ÖÖ, formatter ºÍ writer . formatter ½« HTML ½âÎöÆ÷µÄ±êÇ©ºÍÊý¾ÝÁ÷ת»»ÎªÊʺÏÊä³öÉ豸µÄʼþÁ÷( event stream ), ¶ø writer ½«Ê¼þÁ÷Êä³öµ½É豸ÉÏ.
´ó¶àÇé¿öÏÂ, Äã¿ÉÒÔʹÓà AbstractFormatter Àà½øÐиñʽ»¯. Ëü»á¸ù¾ ......
1 #!/usr/bin/python ʹÓÃħ·¨×Ö·ûµ÷ÓÃpython
2
3 from sys import argv µ¼ÈësysÊǵ¼Èëpython½âÊÍÆ÷ºÍËû»·¾³Ïà¹ØµÄ²ÎÊý
4 from os import makedirs,unlink,sep
osÖ÷ÒªÌṩ¶Ôϵͳ·¾¶£¬ÎļþÖØÃüÃûºÍɾ³ýÎļþËùÐèµÄº¯Êý
makedirsÊÇ´´½¨µÝ¹éÎļþ¼ÐµÄº¯Êý¡£±ÈÈç˵ÎÒÃÇÒª´´½¨Ò»¸öеÄĿ¼£¬/python/HTML/crawl,µ«ÊÇÄ ......
Ç°¼¸Ìì¿´µ½ÁËÒ»ÐÐÇó1000µÄ½×³ËµÄPython´úÂ룺
print
reduce
(
lambda
x
,
y
:
x
*
y
,
range
(
1
,
1001
))
Ò»ÏÂ×Ó±»python´úÂëµÄ¾«¼ò
Óë½ô´ÕËùÕÛ·þ£¬¹Ê¶Ô´úÂë½øÐÐÁ˼òµ¥µÄ·ÖÎö¡£
reduceÓërange¶¼ÊÇPythonµÄÄÚÖú¯Êý¡£
range£¨1£¬10 ......