1.用python读取csv文件

csv是逗号分隔符格式 一般我们用的execl生成的格式是xls和xlsx  直接重命名为csv的话会报错:

Error: line contains NULL byte

insun解决方案:出错原因是直接是把后缀为xls的execl文件重命名为csv的 正常的要是另存为csv文件 就不会报错了

譬如我们有这么个csv文件:

20130314102231751.jpg

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#!/usr/bin/env python
# -*- coding:utf-8 -*-
  
import csv
with open('egg.csv','rb') as f:
reader = csv.reader(f)
for row in reader:
print row


打印出来是这样的list

['a', '1', '1', '1']

['a', '2', '2', '2']

['b', '3', '3', '3']

['b', '4', '4', '4']

['b', '5', '5', '5']

['b', '6', '6', '6']

['c', '7', '7', '7']

['c', '8', '8', '8']

['c', '9', '9', '9']

['c', '10', '10', '10']

['d', '11', '11', '11']

['e', '12', '12', '12']

['e', '13', '13', '13']

['e', '14', '14', '14']


2.用python写入并生成csv

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#!/usr/bin/env python
# -*- coding:utf-8 -*-
  
import csv
with open('egg2.csv''wb') as csvfile:
spamwriter = csv.writer(csvfile, delimiter=' ',quotechar='|', quoting=csv.QUOTE_MINIMAL)
spamwriter.writerow(['a''1''1''2''2'])
spamwriter.writerow(['b''3''3''6''4'])
spamwriter.writerow(['c''7''7''10''4'])
spamwriter.writerow(['d''11','11','11''1'])
spamwriter.writerow(['e''12','12','14''3'])

20130314102236328.jpg

这样存进去的是存到一列了 跟我们原本意图存进5列不一样

使用python的csv生成excel所兼容的csv文件的话,主要就是创建writer时的参数时要有dialect=’excel’

代码修改为:

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#!/usr/bin/env python
# -*- coding:utf-8 -*-
  
import csv
with open('egg2.csv''wb') as csvfile:
spamwriter = csv.writer(csvfile,dialect='excel')
spamwriter.writerow(['a''1''1''2''2'])
spamwriter.writerow(['b''3''3''6''4'])
spamwriter.writerow(['c''7''7''10''4'])
spamwriter.writerow(['d''11','11','11''1'])
spamwriter.writerow(['e''12','12','14''3'])