尝试读取CSV文件的第一行会返回['/']

Question

I have uploaded a CSV file through Django and I trying to read the first line of it. The file is stored on the server in

/tmp/csv_file/test.csv

The file looks like this:

column_1,column_2,column_3
2175,294,Nuristan
2179,299,Sar-e-Pul

I am trying to get the headings of the file like:

absolute_base_file = '/tmp/csv_file/test.csv'
csv_reader = csv.reader(absolute_base_file)
csv_headings = next(csv_reader)
print csv_headings

I only get this in return:

['/']

EDITED

The permissions of the CSV file are:

-rw-rw-r--

Which should be ok.

EDITED AGAIN

Based on the recommendations and the help of @EdChum and @Moses Koledoye

I have checked if the file is read correctly using:

print (os.stat(absolute_base_file).st_size) # returns 64

Then I tried to see if seek(0) and csvfile.read(1) return a single printable character.

   print csvfile.seek(0) returns None
   print csvfile.read(1) returns 'c'

Then I thought perhaps there is a particular issue with next() function and I tried an alternative:

csv_reader = csv.reader(csvfile) 
for row in csv_reader:   
   print ("csv_reader") 

Again this didn't work.

Answer 1

You passed a string instead of a file object which is why you get the slash, change to this:

with open (absolute_base_file) as csvfile:
    csv_reader = csv.reader(csvfile)

check the docs

See this working:

In [5]:
import csv
with open (r'c:\data\csv_test.csv') as csvfile:
    csv_reader = csv.reader(csvfile)
    csv_headings = next(csv_reader)
    print (csv_headings)

['column_1', 'column_2', 'column_3']

To successively access each row call next :

In [7]:
import csv
with open (r'c:\data\csv_test.csv') as csvfile:
    csv_reader = csv.reader(csvfile)
    csv_headings = next(csv_reader)
    print (csv_headings)
    first_row = next(csv_reader)
    print( 'first row: ', first_row)


['column_1', 'column_2', 'column_3']
first row:  ['2175', '294', 'Nuristan']

Answer 2

You should pass a file object to your csv.reader not a string literal.

absolute_base_file = open(r'/tmp/csv_file/test.csv') # notice open
csv_reader = csv.reader(absolute_base_file)
csv_headings = next(csv_reader)
print csv_headings