CSV读卡器重复读取1 lin

Question

我有一个csv.reader正在读取一个文件，但重复读取同一行。你知道吗

import csv

with open('mydata.csv', 'rb') as f:
    reader = csv.reader(f)
    reader.next()
    for row in reader:
        while i < 10:
            print row
            i=i+1

代码打印第二行（因为我想跳过标题）10次。你知道吗

Answer 1

你的代码正在做你让它做的事情。。。 （而且，你的标题也有误导性：读者只阅读了一次，你只是打印了10次）

reader.next() # advances to second line
for row in reader: # loops over remaining lines
    while i < 10: # loops over i
        print row # prints current row - this would be the second row in the first forloop iteration... 10 times, because you loop over i.
        i=i+1 # increments i, so the next rows, i is already >=10, your while-loop only affects the second line.

为什么一开始就有那个while循环？ 您可以轻松地执行以下操作：

   reader = csv.reader(f)
   for rownum, row in enumerate(reader):
     if rownum: #skip first line
        print row