Python 读取csv文件的问题

使用python读取保存的csv时遇到问题：

import csv


with open('blah.csv','rb') as csvfile:
    data = csv.reader( csvfile )
    row_count = sum(1 for row in data)
    print row_count


    r = 1
    for row in data:
        print r

我的问题是，尽管python似乎能识别文件并识别行数=9（并打印），但它不会在后面的循环中为每一行打印r

---

这段代码在我的计算机上正确运行，但在www.pythonanywhere.com上的云中运行不正确，这是因为在下面的行中-

row\u count=sum（数据中的row为1）

-您已经阅读了该文件，并且该文件已经结束。所以当你再次尝试做-

for row in data:
    print r

它不起作用，因为

数据
文件位于末尾

您可以尝试的许多方法之一是重新打开文件，以便从头开始读取

范例-

import csv
with open('blah.csv','rb') as csvfile:
    data = csv.reader( csvfile )
    row_count = sum(1 for row in data)
    print row_count

with open('blah.csv','rb') as csvfile:
    data = csv.reader( csvfile )
    r = 1
    for row in data:
        print r

import csv
with open('blah.csv','rb') as csvfile:
    data = csv.reader( csvfile )
    row_count = sum(1 for row in data)
    print row_count
    csvfile.seek(0)
    r = 1
    for row in data:
        print r

尽管您也可以进行行计数并将行打印到单个循环中，如-

import csv
with open('blah.csv','rb') as csvfile:
    data = csv.reader( csvfile )
    row_count = 0
    for row in data
        row_count += 1
        print row
    print row_count

你能做的另一件事是-

csvfile.seek(0) #to make the file point to the start.

范例-

import csv
with open('blah.csv','rb') as csvfile:
    data = csv.reader( csvfile )
    row_count = sum(1 for row in data)
    print row_count

with open('blah.csv','rb') as csvfile:
    data = csv.reader( csvfile )
    r = 1
    for row in data:
        print r

import csv
with open('blah.csv','rb') as csvfile:
    data = csv.reader( csvfile )
    row_count = sum(1 for row in data)
    print row_count
    csvfile.seek(0)
    r = 1
    for row in data:
        print r

顺便问一下，
row\u count=len（数据）
会更整洁吗？