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  À´Ô´£ºwww.jianshu.com  ·¢²¼ÓÚ£º 2016-12-7
  1544  次浏览      27
 

Python µÄÐòÁУ¨sequence£©Í¨³£Ö¸Ò»¸ö¿Éµü´úµÄÈÝÆ÷£¬ÈÝÆ÷ÖпÉÒÔ´æ·ÅÈÎÒâÀàÐ͵ÄÔªËØ¡£ÆäÖÐÁÐ±í£¨list£©ÊÇʹÓõÄ×î¶àµÄÈÝÆ÷¡£±¾ÎĽ²½âÁËÁбíÍÆµ¼Ê½¡¢ÇÐÆ¬ÃüÃû¡¢ÁбíÔªËØÅÅÐò¡¢ÁбíÔªËØ·Ö×éµÄʹÓ÷½·¨¡£Ñ§Ï°ÁË Python »ù±¾µÄÁбí²Ù×÷ºó£¬Ñ§Ï°ÕâЩ½ø½×µÄ²Ù×÷£¬ÈÃÎÒÃÇд³öµÄ´úÂë¸ü¼ÓÓÅÑżò½àºÍ pythonic ¡£

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µ±ÎÒÃÇÏëÒª¸ù¾ÝijЩ¹æÔòÀ´¹¹ÔìÒ»¸öÁбíʱ£¬Ê×ÏÈÏëµ½µÄÓ¦¸ÃÊÇÁбíÍÆµ¼Ê½¡£ÁбíÍÆµ¼Ê½¼ò»¯ÁËÑ­»·²Ù×÷£¬ÀýÈçÎÒÃÇÏëÒª´ÓÒ»¸öԭʼÎļþÃûÁбíÖлñȡȫ²¿ .py Îļþ£¬ÔÚûÓÐÁбíÍÆµ¼Ê½µÄÇé¿öÏ£¬ÎÒÃÇͨ³£»áÕâÑù×ö£º

file_list = ['foo.py', 'bar.txt', 'spam.py', 'animal.png', 'test.py']
py_list = []

for file in file_list:
if file.endswith('.py'):
py_list.append(file)

print(py_list)
# output
['foo.py', 'spam.py', 'test.py']

¶øÈç¹ûʹÓÃÁбíÍÆµ¼Ê½Ôò¿É¼ò»¯Îª£º

py_list = [f for f in file_list if f.endswith('.py')]
print(py_list)

# output
['foo.py', 'spam.py', 'test.py']

ÁбíÍÆµ¼Ê½µÄ½éÉÜÍøÉÏ×ÊÔ´ºÜ¶à£¬²»ÔÙ׸Êö¡£ÕâÀïֻǿµ÷£¬µ±ÄãÐèÒª¸ù¾Ýij¸ö¹æÔòÀ´¹¹ÔìÒ»¸öÁбíʱ£¬Ê×ÏÈÓ¦¸ÃÏëÒ»Ï룬ÄÜ·ñʹÓüò½àµÄÁбíÍÆµ¼Ê½À´ÊµÏÖ¸ÃÐèÇ󣬷ñÔòÔٻص½³£¹æµÄ·½Ê½¡£

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Python µÄÁбíÇÐÆ¬Ê¹ÓÃÆðÀ´·Ç³£·½±ã£¬µ«ÓÐʱҲ»áÓ°Ïì´úÂë¿É¶ÁÐÔ¡£ÀýÈçÓÐÒ»¸ö×Ö·û´®£º

record = '..........19.6..........100..........'

19.6 Ϊ²úÆ·¼Û¸ñ£¬100 Ϊ²úÆ·ÊýÁ¿£¬ÄÇô¼ÆËã×ܼ۸ñΪ:

total_price = float(record[10:14])*int(record[24:27])

µ«ÊÇÈç¹ûÕâÑùд£¬¿ÉÄܹýÒ»¶Îʱ¼äÎÒÃÇÔÙÀ´¶Á´úÂëʱÒѾ­Íü¼ÇÁË record[10:14] ¡¢record[24:27] ÇгöÀ´µÄ¾¿¾¹ÊÇʲô£¿ÎªÁ˽â¾öÉÏÊöÎÊÌ⣬¿ÉÒÔ¸øÇÐÆ¬Ãü¸öÃûÀ´ÔöÇ¿¿É¶ÁÐÔ¡£

record = '..........19.6..........100..........'
price = slice(10, 14)
count = slice(24, 27)
total_price = float(record[price])*int(record[count])

slice ½ÓÊյIJÎÊý¸ñʽΪ slice(stop)¡¢slice(start, stop[, step])¡£Èç¹ûÖ»½ÓÊÕÁËÒ»¸ö²ÎÊý£¬ÔòµÈ¼ÛÓÚÇÐÆ¬Óï·¨ [:stop] £¬Èç¹û½ÓÊÕÁ½¸ö²ÎÊý£¬ÔòµÈ¼ÛÓÚÇÐÆ¬Óï·¨ [start:stop] £¬Èç¹û½ÓÊÕÈý¸ö²ÎÊý£¬ÔòµÈ¼ÛÓÚÇÐÆ¬Óï·¨ [start:stop:step] ¡£

ÅÅÐò

ÅÅÐòÏà¹ØµÄÈÎÎñͨ³£ÓÉÄÚÖú¯Êý sorted Íê³É¡£ÐèÒªÅÅÐòµÄÔªËØÒ»°ã´æ·ÅÔÚÒ»¸öÁбíÈÝÆ÷ÖУ¬Áбí¿ÉÒÔ´æ·ÅÈÎÒâÀàÐ͵ÄÔªËØ£¬¶ø sorted º¯ÊýµÄ key ¹Ø¼ü×ÖʹµÃÎÒÃÇÄܹ»ÇáËɵØÖ¸¶¨ÔªËØÅÅÐòµÄ¹Ø¼ü×Ö£¬ÈÃÅÅÐò±äµÃÒì³£¼òµ¥¡£ÏÂÃæ½«¸ø³ö¼¸¸ö³£¼ûµÄÅÅÐòÀý×ÓÒÔ˵Ã÷ key ¹Ø¼ü×ÖµÄʹÓ÷½·¨¡£×¢Òâ Python3 ºÍ Python2 µÄÅÅÐò·½·¨²»ÄÜͨÓã¬ÏÂÃæµÄÀý×ÓÖ»ÊÊÓÃÓÚ Python3 £¬Python2 µÄÅÅÐò·½·¨Î´°üº¬ÔÚ±¾ÎÄÖС£

Çé¿öÒ»

ÁбíÖеÄÔªËØÒѾ­ÊǿɱȽÏÔªËØ£¬Ö±½Ó½«ÁÐ±í´«Èë sorted º¯Êý¼´¿É·µ»ØÒ»¸öÒÑÅÅÐòÁÐ±í¡£Ä¬ÈÏΪÉýÐòÅÅÁУ¬½µÐòÅÅÁпÉÒÔÖ¸¶¨ reverse ²ÎÊý£¬ÀýÈ磺

>>> l = [3,5,4,1,8]
>>> sorted(l)
[1, 3, 4, 5, 8]

>>> sorted(l, reverse=True)
[8, 5, 4, 3, 1]
>>>

Çé¿ö¶þ

ÐèÒªÅÅÐòµÄÔªËØÊÇÒ»¸öÔª×é»òÕß×ֵ䣬ϣÍû¸ù¾ÝÎÒÖ¸¶¨µÄ¹Ø¼ü×ÖÀ´ÅÅÐò£¬ÀýÈçÓÐÈçÏÂÁ½¸öÁÐ±í£º

l_v1 = [('b',2),('a',1),('c',3),('d',4)]
l_v2 = [
{'fname': 'Brian', 'lname': 'Jones', 'uid': 1003},
{'fname': 'David', 'lname': 'Beazley', 'uid': 1002},
{'fname': 'John', 'lname': 'Cleese', 'uid': 1001},
{'fname': 'Big', 'lname': 'Jones', 'uid': 1004}
]

l_v1 ÊÇÒ»¸öÔª×éÁÐ±í£¬ l_v2 ÊÇÒ»¸ö×ÖµäÁÐ±í¡£¶Ô l_v1 ÎÒÃÇÏ£Íû¸ù¾ÝÔª×éÖеڶþ¸öÔªËØÀ´ÅÅÐò£¬¶Ô l_v2 ÎÒÃÇÏ£Íû¸ù¾Ý×ÖµäµÄ¹Ø¼ü×Ö uid ½øÐÐÅÅÐò¡£

sorted º¯Êý½ÓÊÕÒ»¸ö¹Ø¼ü×Ö²ÎÊý key £¬¸Ã²ÎÊýÖ¸¶¨Ò»¸ö¿Éµ÷Óú¯Êý£¬º¯Êý·µ»ØÒ»¸öÖµ£¨Ö»ÒªÊǿɱȽϵģ©£¬ÄÇô sorted º¯Êý½«¸ù¾Ý·µ»ØµÄ¹Ø¼ü×Ö¶ÔÁбíÖеÄÔªËØ½øÐÐÅÅÐò¡£ÀýÈç¶ÔÉÏÃæµÄÀý×Ó£º

>>> l_v1 = [('b',2),('a',1),('c',3),('d',4)]
>>> sorted(l_v1, key=lambda x: x[1])
[('a', 1), ('b', 2), ('c', 3), ('d', 4)]

>>> l_v2 = [
{'fname': 'Brian', 'lname': 'Jones', 'uid': 1003},
{'fname': 'David', 'lname': 'Beazley', 'uid': 1002},
{'fname': 'John', 'lname': 'Cleese', 'uid': 1001},
{'fname': 'Big', 'lname': 'Jones', 'uid': 1004}
]
>>> sorted(l_v2, key=lambda x: x['uid'])
[{'lname': 'Cleese', 'uid': 1001, 'fname': 'John'}, {'lname': 'Beazley', 'uid': 1002, 'fname': 'David'}, {'lname': 'Jones', 'uid': 1003, 'fname': 'Brian'}, {'lname': 'Jones', 'uid': 1004, 'fname': 'Big'}]

ÕâÀï lambda º¯ÊýÊÇÒ»¸ö³£Óõļ¼ÇÉ¡£lambda ¹Ø¼ü×Öºó±ßµÄ x ÊǸú¯Êý½ÓÊյIJÎÊý£¬Ã°ºÅºó±ßµÄ±í´ïʽÊǸú¯ÊýµÄ·µ»ØÖµ¡£¶Ô l_v1 À´Ëµ£¬´«µÝ¸ø²ÎÊý x µÄ¾ÍÊÇÿһ¸öÔª×飬Æä·µ»ØÔª×éµÄµÚ¶þ¸öÔªËØÓÃÓÚÅÅÐò£»¶Ô l_v2 À´Ëµ£¬´«µÝ¸ø²ÎÊý x µÄ¾ÍÊÇÁбíÖеÄÿһ¸ö×ÖµäÔªËØ£¬Æä·µ»Ø×ÖµäÖÐ uid ¶ÔÓ¦µÄÖµÓÃÓÚÅÅÐò¡£

³ýÁËʹÓÃÄäÃûº¯Êý lambda ÕâÖÖͨÓõķ½·¨Í⣬Python ±ê×¼¿â operator ΪÎÒÃÇÌṩÁËÒ»¸ö itemgetter º¯ÊýÌæ´úÎÒÃÇдµÄ lambda º¯Êý£¬ÇÒÆäÐÔÄÜ»á±ÈʹÓà lambda º¯ÊýÂÔÓÐÌáÉý¡£

>>> from operator import itemgetter
>>> l_v1 = [('b',2),('a',1),('c',3),('d',4)]
>>> sorted(l_v1, key=itemgetter(1))
[('a', 1), ('b', 2), ('c', 3), ('d', 4)]

>>> l_v2 = [
{'fname': 'Brian', 'lname': 'Jones', 'uid': 1003},
{'fname': 'David', 'lname': 'Beazley', 'uid': 1002},
{'fname': 'John', 'lname': 'Cleese', 'uid': 1001},
{'fname': 'Big', 'lname': 'Jones', 'uid': 1004}
]
>>> sorted(l_v2, key=itemgetter('uid'))
[
{'lname': 'Cleese', 'uid': 1001, 'fname': 'John'},
{'lname': 'Beazley', 'uid': 1002, 'fname': 'David'},
{'lname': 'Jones', 'uid': 1003, 'fname': 'Brian'},
{'lname': 'Jones', 'uid': 1004, 'fname': 'Big'}
]

ÒÔÉÏÀý×Ó¾ùÊÇ·µ»ØÒ»¸öµ¥Ò»µÄÖµÓÃÓÚÅÅÐò¹Ø¼ü×Ö£¬Ç°ÃæËµ¹ý£¬¹Ø¼ü×Ö key ½ÓÊյĺ¯Êý¿ÉÒÔ·µ»ØÈÎÒâµÄ¿É±È½Ï¶ÔÏó¡£ÀýÈçÔÚ python ÖУ¬Ôª×éÊÇ¿ÉÒԱȽϵġ£¶ÔÔª×éµÄ±È½Ï¹æÔòΪÊ×ÏȱȽÏÔª×éÖеÚÒ»¸öλÖÃÉϵÄÔªËØ£¬Èç¹ûÏàµÈ£¬ÔڱȽϵڶþ¸öλÖÃÉϵÄÔªËØ£¬ÒÀ´ÎÀàÍÆ¡£»Øµ½ l_v2 µÄÀý×Ó£¬¼ÙÉèÏÖÔÚÐèÇó±äÁË£¬ÎÒÃÇÊ×ÏÈ¶Ô lname ¶ÔÓ¦µÄÖµÅÅÐò£¬Èç¹û lname ¶ÔÓ¦µÄÖµÏàµÈ£¬ÄÇôÔÙ¸ù¾Ý fname È·¶¨Æä˳Ðò¡£

>>> l_v2 = [
{'fname': 'Brian', 'lname': 'Jones', 'uid': 1003},
{'fname': 'David', 'lname': 'Beazley', 'uid': 1002},
{'fname': 'John', 'lname': 'Cleese', 'uid': 1001},
{'fname': 'Big', 'lname': 'Jones', 'uid': 1004}
]
>>> sorted(l_v2, key=lambda x: (x['lname'], x['fname']))
[
{'lname': 'Beazley', 'uid': 1002, 'fname': 'David'},
{'lname': 'Cleese', 'uid': 1001, 'fname': 'John'},
{'lname': 'Jones', 'uid': 1004, 'fname': 'Big'},
{'lname': 'Jones', 'uid': 1003, 'fname': 'Brian'}
]

Õâ¸öÀý×ÓÖУ¬lambda º¯Êý·µ»ØµÄ²»ÔÙÊÇÒ»¸ö±êÁ¿Öµ£¬¶øÊÇÒ»¸öÔª×é (x['lname'], x['fname']) £¬¸ù¾ÝÔª×éµÄ±È½Ï¹æÔò£¬Ê×Ïȸù¾ÝÔª×éµÄµÚÒ»¸öλÖÃÉϵÄÔªËØ x['lname'] µÄ´óСÅÅÐò£¬ÓÉÓÚÁбíÖÐÓÐÁ½¸ö×ÖµäÆä lname ¶ÔÓ¦µÄÖµ¶¼Îª Jones£¬Òò´ËÔÙ¸ù¾ÝÔª×éµÚ¶þ¸öλÖõÄÔªËØ x['fname'] µÄÖµÅÅÐò£¬ÓÉÓÚ Big ±È Brian ҪС£¨°´×Öĸ˳ÐòÒÀ´Î±È½Ï£©£¬ËùÒÔ Big ÅÅÔÚÁËÇ°Ãæ¡£

ͬÑùʹÓà itemgetter º¯ÊýÒ²ÊÇ¿ÉÒԵģ¬ÇÒÐÔÄÜ»áÂÔÓÐÌáÉý¡£´ËÍâÎÒ¾õµÃ itemgetter ±È lambda ¸ü¼Ó¼ò½àºÍ¿É¶ÁÒ»µã¡£

>>> l_v2 = [
{'fname': 'Brian', 'lname': 'Jones', 'uid': 1003},
{'fname': 'David', 'lname': 'Beazley', 'uid': 1002},
{'fname': 'John', 'lname': 'Cleese', 'uid': 1001},
{'fname': 'Big', 'lname': 'Jones', 'uid': 1004}
]
>>> sorted(l_v2, key=itemgetter('lname', 'fname'))
[
{'lname': 'Beazley', 'uid': 1002, 'fname': 'David'},
{'lname': 'Cleese', 'uid': 1001, 'fname': 'John'},
{'lname': 'Jones', 'uid': 1004, 'fname': 'Big'},
{'lname': 'Jones', 'uid': 1003, 'fname': 'Brian'}
]

Çé¿öÈý

ÐèÒªÅÅÐòµÄÔªËØÊÇÒ»¸ö Python ¶ÔÏó£¬ÎÒÃÇÏ£Íû¸ù¾ÝÆäij¸öÊôÐÔÖµÀ´ÅÅÐò¡£ÀýÈçÒ»¸ö´æ·Å User ¶ÔÏóµÄÁбíÈçÏ£¬¸ù¾ÝÆä name ÊôÐÔÅÅÐò£º

class User:
def __init__(self, name):
self.name = name

def __str__(self):
return 'User: %s' % self.name

__repr__ = __str__ # ΪÁËÄܹ»Èà User ÔÚ½âÊÍÆ÷ÖÐÏÔʾΪ 'User: name' µÄ¸ñʽ

user_list = [User('John'), User('David'), User('Big'), User('Alen')]

·½·¨ÓëÇ°ÃæµÄÒ»Ñù£¬¶¨ÒåÒ»¸öº¯Êý·µ»Ø User µÄ name ÊôÐÔµÄÖµ£¬°Ñ¸Ãº¯Êý´«¸ø sorted µÄ key ²ÎÊý¡£

>>> user_list = [User('John'), User('David'), User('Big'), User('Alen')]
>>> sorted(user_list, key=lambda x: x.name)
>>> sorted(user_list, key=lambda x: x.name)
[User: Alen, User: Big, User: David, User: John]

µ«ÊÇ£¬itemgetter ·½·¨²»ÔÙÆð×÷Óã¬È¡¶ø´úÖ®µÄÊÇ attrgetter ·½·¨¡£

>>> sorted(user_list, key=attrgetter('name'))
[User: Alen, User: Big, User: David, User: John]

attrgetter Óë itemgetter Ó÷¨ÍêȫһÖ£¬Ö»ÊÇ itemgetter ÓÃÓÚ»ñȡij¸öλÖÃË÷Òý»òÕß×ֵ乨¼ü×ÖµÄȡֵ£¬¶ø attrgetter ÓÃÓÚ»ñÈ¡¶ÔÏóµÄÊôÐÔÖµ¡£

PS£ºsorted ·µ»ØµÄÊÇԭʼÁбíµÄÒ»¸öÒÑÅÅÐòµÄ¸±±¾£¬¶øÔ­Ê¼ÁбíµÄ˳Ðò²¢Ã»ÓÐÈκα仯¡£Èç¹ûÄãÖ»Ïë¾ÍµØÅÅÐò£¨¼´ÅÅÐòԭʼÁÐ±í±¾Éí£©£¬ÔòÖ±½Óµ÷Óà list µÄ sort ·½·¨¼´¿É£ºlist.sort()¡£ÆäÓ÷¨Óë sorted º¯ÊýÒ»Ñù£¬Ö»ÊǸú¯ÊýûÓзµ»ØÖµ£¬µ÷ÓúóԭʼÁбíÒѱäΪһ¸öÒÑÅÅÐòÁÐ±í¡£

¶ÔÐòÁÐÖеÄÔªËØ½øÐзÖ×é

ºÍÅÅÐòÀàËÆ£¬ÏÖÏë¸ù¾ÝÁбíÖÐÔªËØµÄij¸ö¹Ø¼ü×Ö·Ö×飬ʹ¹Ø¼ü×ÖÏàͬµÄÔªËØ·Öµ½Í¬Ò»×飬²¢¿ÉÒԶԷֺõÄ×é½øÐнøÒ»²½´¦Àí¡£ÀýÈçÓÐÈçϵÄÒ»¸öÁÐ±í£º

rows = [
{'address': '5412 N CLARK', 'date': '07/01/2012'},
{'address': '5148 N CLARK', 'date': '07/04/2012'},
{'address': '5800 E 58TH', 'date': '07/02/2012'},
{'address': '2122 N CLARK', 'date': '07/03/2012'},
{'address': '5645 N RAVENSWOOD', 'date': '07/02/2012'},
{'address': '1060 W ADDISON', 'date': '07/02/2012'},
{'address': '4801 N BROADWAY', 'date': '07/01/2012'},
{'address': '1039 W GRANVILLE', 'date': '07/04/2012'},
]

ÁбíµÄÔªËØÎª×ֵ䣬ÏÖÏë¸ù¾Ý×ÖµäµÄ date ·Ö×飬ʹÈÕÆÚ£¨ date £©ÏàͬµÄÔªËØ·Öµ½Ò»¸ö×é¡£Python µÄ itertools Ä£¿éÖÐµÄ groupby º¯Êý¿ÉÒԺܺõؽâ¾ö¸ÃÎÊÌ⡣ΪÁËʹÓà groupby º¯Êý£¬Ê×ÏÈÐèÒª¶ÔÁбíÅÅÐò£º

>>> from operator import itemgetter
>>> sorted_rows = sorted(rows, key=itemgetter('date'))

groupby Ò²ºÍ sorted Ò»ÑùÓÐÒ»¸ö key ¹Ø¼ü×Ö²ÎÊý£¬Æä½ÓÊÕÒ»¸ö¿Éµ÷Óú¯Êý£¬¸Ãº¯Êý·µ»ØµÄÖµ±»ÓÃ×ö·Ö×éµÄ¹Ø¼ü×Ö£¬ÆäÓ÷¨ºÍ sorted µÄ key ¹Ø¼ü×Ö²ÎÊýÒ»Ñù ¡£

'
>>> for date, items in groupby(sorted_rows, key=itemgetter('date')):
print(date)
for i in items:
print(' ', i)

07/01/2012
{'address': '5412 N CLARK', 'date': '07/01/2012'}
{'address': '4801 N BROADWAY', 'date': '07/01/2012'}
07/02/2012
{'address': '5800 E 58TH', 'date': '07/02/2012'}
{'address': '5645 N RAVENSWOOD', 'date': '07/02/2012'}
{'address': '1060 W ADDISON', 'date': '07/02/2012'}
07/03/2012
{'address': '2122 N CLARK', 'date': '07/03/2012'}
07/04/2012
{'address': '5148 N CLARK', 'date': '07/04/2012'}
{'address': '1039 W GRANVILLE', 'date': '07/04/2012'}

 

¿ÉÒÔ¿´µ½ groupby ·µ»ØµÄÖµ·Ö±ðÊÇÓÃÓÚ·Ö×éµÄ¹Ø¼ü×Ö¶ÔÓ¦µÄÖµºÍ¸Ã×éµÄÈ«²¿³ÉÔ±¡£groupby ʵ¼Ê·µ»ØÒ»¸öÉú³ÉÆ÷£¬Í¨¹ýµü´ú¼´¿É·Ö±ð¶Ô¸÷×é½øÐд¦Àí¡£ÖµµÃ×¢ÒâµÄÒ»µãÊÇ£¬·Ö×éǰ¶ÔÁбíÅÅÐòÕâÒ»²½±Ø²»¿ÉÉÙ£¬·ñÔò¶ÔÓڷǽôÁÚµÄÔªËØ¼´Ê¹ÆäÖµÏàͬҲ»á±»·ÖÔÚ²»Í¬×é¡£

 

   
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