[issue24503] csv.writer fails when within csv.reader

[Wolfgang E. Sanyer]

Wolfgang E. Sanyer added the comment:

You can close this - it turns out that I was looping through the input file 
once first, and did not properly rewind it after doing so.

Might it make sense to have the csv module rewind the file after it has been 
looped through, so that it acts as a typical list?

--
status: open -> closed

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[issue24503] csv.writer fails when within csv.reader

[Wolfgang E. Sanyer]

New submission from Wolfgang E. Sanyer:

I have a use case where I am using a csv.reader to loop through one file and 
trying to use a csv.writer to output to another file. However, when I do this, 
the csv.writer instance does not write anything to the output file.

ex:

import csv

with open("input.csv", "rb") as input, open("output.csv", "wb") as output:
reader = csv.reader(input)
writer = csv.writer(output)

for row in reader:
writer.writerow("data") # this writes out nothing

writer.writerow("more data") # this writes out something

--
components: Library (Lib)
messages: 245772
nosy: ezzieyguywuf
priority: normal
severity: normal
status: open
title: csv.writer fails when within csv.reader
type: behavior
versions: Python 2.7

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