csv 文件中的行数 [英] Row count in a csv file

问题描述

我可能犯了一个愚蠢的错误，但我找不到它在哪里.我想计算我的 csv 文件中的行数.我写了这个，显然不起作用:我有 row_count = 0 而它应该是 400.干杯.

I am probably making a stupid mistake, but I can't find where it is. I want to count the number of lines in my csv file. I wrote this, and obviously isn't working: I have row_count = 0 while it should be 400. Cheers.

f = open(adresse,"r")
reader = csv.reader(f,delimiter = ",")
data = [l for l in reader]
row_count = sum(1 for row in reader)

print row_count

推荐答案

with open(adresse,"r") as f:
    reader = csv.reader(f,delimiter = ",")
    data = list(reader)
    row_count = len(data)

当保存data 列表后文件指针已到达文件末尾时，您正试图读取该文件两次.

You are trying to read the file twice, when the file pointer has already reached the end of file after saving the data list.

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