Question

我已经格式化了我的csv文件，现在它看起来像这样：

100|1000|newyork|2015/10/04|2015/10/04 16:23:37.040000|

101|1001|london|2015/10/04|2015/10/04 16:23:37.040000|

102|1002|california|2015/10/04|2015/10/04 16:23:37.041000|

103|1003|Delhi|2015/10/04|2015/10/04 16:23:37.041000|

104|1004|Mumbai|2015/10/04|2015/10/04 16:23:37.041000|

105|1005|Islamabad|2015/10/04|2015/10/04 16:23:37.041000|

106|1006|karachi|2015/10/04|2015/10/04 16:23:37.041000|

现在我有两种不同的日期格式，我希望将其转换为'YYmmdd'格式。

任何人都可以提出实现这一目标的最佳方法。注意：文件名不应该更改，为了您的参考，这是我实现格式化文件的方式，这里给出：

inputfile = 'c:\Working\HK.txt'

outputfile = inputfile + '.tmp'
with contextlib.nested(open(inputfile, 'rb'), open(outputfile, 'wb')) as (inf,outf):
    reader = csv.reader(inf)
    writer = csv.writer(outf, delimiter='|')
    for row in reader:
        writer.writerow([col.replace('|', ' ') for col in row])
        writer.writerow([])
os.remove(inputfile)
os.rename(outputfile,inputfile)

Answer 1

我认为这应该有效。您可以通过更改strftime来随意调整日期格式。

#!/usr/bin/python
from dateutil.parser import parse

lines = ['100|1000|newyork|2015/10/04|2015/10/04 16:23:37.040000|',
         '101|1001|london|2015/10/04|2015/10/04 16:23:37.040000|',
         '102|1002|california|2015/10/04|2015/10/04 16:23:37.041000|',
         '103|1003|Delhi|2015/10/04|2015/10/04 16:23:37.041000|',
         '104|1004|Mumbai|2015/10/04|2015/10/04 16:23:37.041000|',
         '105|1005|Islamabad|2015/10/04|2015/10/04 16:23:37.041000|',
         '106|1006|karachi|2015/10/04|2015/10/04 16:23:37.041000|']

for line in lines:
    parts = line.split("|");

    tmp_date = parse(parts[3])
    parts[3] = tmp_date.strftime('%Y%m%d') 

    tmp_date = parse(parts[4])
    parts[4] = tmp_date.strftime('%Y%m%d')

    new_line = "|".join(parts) 
    print new_line

Answer 2

如果你有Python 2.6+，你可以在python

中完成

from __future__ import print_function
import re

with open('data','r') as f, open('data_out', 'w') as f_out:

    for line in f:
        line = re.sub('(|\d{4})/(\d{2})/(\d{2})',r'\1\3\2', line)
        line = re.sub('\s+\d{2}:\d{2}:\d{2}.\d+(|)',r'\1', line)

        print(line, file=f_out)

this is what i got in my data_out

100|1000|newyork|20151004|20151004|
101|1001|london|20151004|20151004|
102|1002|california|20151004|20151004|
103|1003|Delhi|20151004|20151004|
104|1004|Mumbai|20151004|20151004|
105|1005|Islamabad|20151004|20151004|
106|1006|karachi|20151004|20151004|

使用python 2.6格式化CSV中不同类型的日期

2 个答案: