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python enumerateÓ÷¨

python cookbook  
Recipe 2.5. Counting Lines in a File
£¬
     ½ñÈÕ·¢ÏÖÒ»¸öк¯Êý
enumerate
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for
i
in
range
(0
,
len
(list
)):

    print
i
,
list
[
i
]
 
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ÄÚÖÃenumerrateº¯Êý»áÓиü¼ÓÖ±½Ó£¬ÓÅÃÀµÄ×ö·¨£¬ÏÈ¿´¿´enumerateµÄ¶¨Ò壺

 
def
enumerate
(collection
):

    'Generates an indexed series: 
(0,coll[0]), (1,coll[1]) ...'
     
     i
=
0

     it
=
iter
(collection
)
     while
1
:

     yield
(i
,
it
.
next
())

     i
+=
1
 
enumerate»á½«Êý×é»òÁбí×é³ÉÒ»¸öË÷ÒýÐòÁС£Ê¹ÎÒÃÇÔÙ»ñÈ¡Ë÷ÒýºÍË÷ÒýÄÚÈݵÄʱºò¸ü¼Ó·½±ãÈçÏ£º

for
index
£¬
text
in
enumerate
(list
)):

   print
index
,
text
   ÔÚ
cookbookÀï½éÉÜ£¬Èç¹ûÄãÒª¼ÆËãÎļþµÄÐÐÊý£¬¿ÉÒÔÕâÑùд£º

count
=
len
(open
(thefilepath
,

rU

).
readlines
())
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Count
=
-
1

For
count
,
line
in
enumerate
(open
(thefilepath
,

rU

))£º

    Pass
Count
+=
1


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f =
file('x1.txt', 'w')
f.write(u'ÖÐÎÄ')
f.colse()
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½Ó½á¹ûÓ¦¸ÃÊÇÀàËÆ
    f.write(u'ÖÐÎÄ')
UnicodeEncodeError: 'ascii'
codec can't encode characters in position 0-16: ordinal not in
range(128)
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import codecs
f = codecs. ......

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Python
"xlrd" package for extracting data from Excel files
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#coding=utf-8
import xlrd
import os, types, datetime
#excel´æ·ÅĿ¼
dir = u'D:\\temp\\excel'
......

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Python °ËÈٰ˳Ü

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