[python-events] I find a bug of python

[M.-A. Lemburg]

Hello,

this is the Python event mailing list and not the right place to
submit Python bug report. You should open a report on our
issue tracker instead:

https://bugs.python.org/

If you want to discuss the report with others, it's probably
best to ask on comp.lang.python or the sync'ed mailing list
list https://mail.python.org/mailman/listinfo/python-list.

Cheers,
-- 
Marc-Andre Lemburg
eGenix.com

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On 14.06.2018 10:47, 李远志 wrote:
> hello , when you run this code:
> import csv
> csvFile = open('mycve.csv','r')
> csv_reader = csv.reader(csvFile)
> print list(csv_reader )
> print list(csv_reader )
> 
> you will find that first 'print' can print the content of mucve.csv
> successfully , but the second print will print an empty list
> when I try to solve this question , I find that csv_reader's
> line_num variable is the length of mycve.csv after first print function.
> so when I start the second print , I will get an empty list 
> I try to solve like this after first print  :
> csv_reader.line_num = 0
> but it's a readonly attribute.
> I know when we programming ， we can solve this bug like this :
> a = list(csv_reader)
> print a
> print a
> 
> but when we want to use csv_reader again , we will get an empty
> list,maybe some people will doubt when they code like this:
> a = list(csv_reader)
> b = list(csv_reader)
> 
> why 'b' is empty!!?
> this is a little bug of python,but I hope you can solve this ,wish
> python better and better
> 
> 
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> 
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>