python×ÖµäÅÅÐò
python×ÖµäÅÅÐò
1¡¢
×¼±¸ÖªÊ¶£º
ÔÚpythonÀ×ÖµädictionaryÊÇÄÚÖõÄÊý¾ÝÀàÐÍ£¬ÊǸöÎÞÐòµÄ´æ´¢½á¹¹£¬Ã¿Ò»ÔªËØÊÇkey-value¶Ô£º
È磺dict = {‘username’£º‘password’£¬‘database’£º‘master’}£¬ÆäÖБusername’ºÍ‘database’ÊÇkey£¬¶ø‘password’ºÍ‘master’ÊÇvalue£¬¿ÉÒÔͨ¹ýd[
key
]»ñµÃ¶ÔÓ¦ÖµvalueµÄÒýÓ㬵«ÊDz»ÄÜͨ¹ývalueµÃµ½key¡£
¶ÔÓÚdictionnary£¬ÐèÖªµÀÒÔϼ¸µã×¢ÒâÊÂÏ
a¡¢
dictionary µÄ key ÊÇ´óСдÃô¸ÐµÄ
£»
b¡¢
Ò»¸ödictionaryÖв»ÄÜÓÐÖØ¸´µÄ key
£»
c¡¢
d
ictionary
ÊÇÎÞÐòµÄ£¬Ã»ÓÐÔªËØË³ÐòµÄ¸ÅÄ
ËüÃÇÖ»ÊÇÐòżµÄ¼òµ¥ÅÅÁÐ
¡£
2¡¢
×ÖµäÅÅÐòʵÏÖ£º
²Î¼ûcookbook£¬
Recipe 5.1. Sorting a Dictionary
½²ÊöÁË×ÖµäÅÅÐòµÄ·½·¨£»
Ç°ÃæÒÑ˵Ã÷d
ictionary
±¾ÉíûÓÐ˳Ðò¸ÅÄµ«ÊÇ×ÜÊÇÔÚijЩʱºò£¬µ«ÊÇÎÒÃdz£³£ÐèÒª¶Ô×ֵ佸ÐÐÅÅÐò£¬Ôõô×öÄØ£¿ÏÂÃæ¸æËßÄ㣺
·½·¨1£º
×î¼òµ¥µÄ·½·¨£¬
ÅÅÁÐÔªËØ£¨key/value¶Ô£©
£¬
È»ºóÌô³öÖµ
¡£
×ÖµäµÄ
items
·½·¨£¬»á·µ»ØÒ»¸öÔª×éµÄÁÐ±í£¬ÆäÖÐÿ¸öÔª×é¶¼°üº¬Ò»¶ÔÏîÄ¿——¼üÓë¶ÔÓ¦µÄÖµ
¡£´ËʱÅÅÐò¿ÉÒÔ
sort()·½·¨
¡£
def
sortedDictValues1(adict):
items = adict.items()
items.sort()
return
[value for
key, value in
items]
·½·¨2£º
ʹÓÃÅÅÁмü
£¨key£©
µÄ·½Ê½£¬Ìô³öÖµ£¬Ëٶȱȷ½·¨1¿ì¡£
×Öµä¶ÔÏóµÄkeys()·½·¨·µ»Ø×ÖµäÖÐËùÓмüÖµ×é³ÉµÄÁÐ±í£¬´ÎÐòÊÇËæ»úµÄ¡£ÐèÒªÅÅÐòʱֻҪ¶Ô·µ»ØµÄ¼üÖµÁбíʹÓÃsort()·½·¨
¡£
def
sortedDictValues1(adict):
keys = adict.keys()
keys.sort()
return
[adict[key] for
key in
keys]
·½·¨3£º
ͨ¹ýÓ³ÉäµÄ·½·¨È¥¸üÓÐЧµÄÖ´ÐÐ×îºóÒ»²½
def
sortedDictValues1(adict):
keys = adict.keys()
keys.sort()
return
map£¨
adict.get,keys£©
·½·¨4£º
¶Ô×ֵ䰴¼üÅÅÐò£¬ÓÃÔª×éÁбíµÄÐÎʽ·µ»Ø£¬Í¬Ê±Ê¹ÓÃlambdaº¯ÊýÀ´½øÐУ»
sorted
(iterable
[
, cmp
[
Ïà¹ØÎĵµ£º
ǰ¼¸Ì죬СÐí¸øÎÒÒ»·ÝJavaQQµÄÔ´´úÂ룬ÓÃvim´ò¿ªÒ»¿´£¬·¢ÏÖÀïÃæµÄÖÐÎͼÊÇÂÒÂë¡£²»ÓÃ˵£¬ÓÖÊǿɶñµÄ±àÂëÎÊÌ⣬ÔÚwindowϵÄÎı¾Îļþͨ³£Ê¹ÓÃGBK»òGB18030±àÂ룬¶øÔÚLinuxÏÂutf-8±àÂëÔò´óÐÐÆäµÀ¡£´ò¿ª——Áí´æÎª¿Ï¶¨²»ÊÇÉϲߣ¬ÉÏÍøÕÒ±àÂëÅúÁ¿×ª»»¹¤¾ßÒ²²»ÊÇÔÛÇÚÀÍÓ¸ҵijÌÐòÔ±µÄ×÷·ç¡£×ÔÒѶ¯ÊÖ ......
ÏÂÔØ°²×°MySQLdb
http://sourceforge.net/projects/mysql-python/ ºÃÏñû¿´µ½windows°æ±¾for python2.6µÄÏÂÔØ£¬ÍøÉÏËÑË÷µ½Ò»¸ö
http://www.technicalbard.com/files/MySQL-python-1.2.2.win32-py2.6.exe
°²×°ºóimport MySQLdb»á³öÏÖ DeprecationWarning: the sets module is deprecated ÕâÑùÒ»¸ö¾¯¸æ£¬googleÖ®
......
À´Ô´:
×÷Õß:
Áé½£
1.python ×Ö·û´®Í¨³£Óе¥ÒýºÅ£¨'...'£©¡¢Ë«ÒýºÅ£¨...£©¡¢ÈýÒýºÅ£¨...£©»ò£¨'''...'''£©°üΧ£¬ÈýÒýºÅ°üº¬µÄ×Ö·û´®¿ÉÓɶàÐÐ×é³É£¬Ò»°ã¿É±íʾ´ó¶ÎµÄÐðÊöÐÔ×Ö·û´®¡£ÔÚʹÓÃʱ»ù±¾Ã»Óвî±ð£¬
1.python
×Ö·û´®Í¨³£Óе¥ÒýºÅ£¨'...'£©¡¢Ë«ÒýºÅ£¨"..."£©¡¢ÈýÒýºÅ£¨"""... ......
Ê×ÏÈ×ªÔØÒ»¶Î¹ØÓÚÍÆ¼öµÄѧϰpythonµÄÊé¼®£¨ÔÎÄÁ´½Ó£©£º
1.ѧϰ¡¶A Byte of Python¡·£¬ÖÐÎÄÒëÃûΪ¡¶Python¼òÃ÷½Ì³Ì£¨pdfÏÂÔØµØÖ·£©¡·£¬È«ÊéÏÂÀ´Ö»ÓÐ100¶àÒ³£¬¼òµ¥¸ÉÁ·£¬Í¨Ë×Ò×¶®£¬Êǹ«ÈϵÄPythonÈëÃŽ̡̳£ÎÒËäȻϵ½ÁË¡¶Python¼òÃ÷½Ì³Ì¡·pdf°æ£¬µ«ÊǾõµÃÆäÖеĴúÂë¿ÉÄÜÊÇÒòΪÒëÕßת»»ÎĵµÀàÐ͵ÄÔÒò£¬¸ñʽ±äµÃºÜÂÒ£¬ËùÒÔ× ......
And last here is the overload operators example:
# map() takes two (or more) arguments, a function and a list to apply the function to
# lambda can be put anywhere a function is expected
# map() calls lambada for every element in the self list
# since Vector has overloaded __getitem__ and __len_ ......