[issue36278] Truncate method

[Josh Rosenberg]

Change by Josh Rosenberg :


--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> File truncate() not defaulting to current position as documented

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[issue36278] Truncate method

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

This looks like a similar report to issue26158 where truncate refers to the 
position of the underlying buffer and could be documented better.

--
nosy: +serhiy.storchaka, xtreak

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[issue36278] Truncate method

[Cavad Salmanov]

New submission from Cavad Salmanov :

I created a new file for researching truncate() method. and I writed  this text:
alma
armud
heyva
nar
qarpiz
yemis

I wanted to delete all the text apart from first line by truncate method.

I writed these codes on python idle:
__
#First, I read text for showing it's content
>>> dosya = open('deneme.txt','r')
>>> dosya.read()
'alma\narmud\nheyva\nnar\nqarpiz\nyemis'
>>> dosya.close()


#Then writing codes for operation which I wanted
>>> dosya = open('deneme.txt','r+')
>>> dosya.readline()
'alma\n'
>>> dosya.tell()
6
>>> dosya.truncate()
38
>>> dosya.seek(0)
0
>>> dosya.read()
'alma\narmud\nheyva\nnar\nqarpiz\nyemis'
>>> dosya.close()
#I thought I must closed the file, then read again:


#Then I saw nothing has changed
>>> dosya = open('deneme.txt','r')
>>> dosya.read()
'alma\narmud\nheyva\nnar\nqarpiz\nyemis'
>>> dosya.close()

#But when I writed codes in this way, it is worked
>>> dosya = open('deneme.txt','r+')
>>> dosya.readline()
'alma\n'
>>> dosya.tell()
6
>>> dosya.seek(6)
6
>>> dosya.truncate()
6
>>> dosya.close()
>>> dosya = open('deneme.txt','r')
>>> dosya.read()
'alma\n'

# I was on 6th byte in both. But it is worked which I used seek() #method. I 
think both of them were returnden same things

--
messages: 337830
nosy: Cavad Salmanov
priority: normal
severity: normal
status: open
title: Truncate method
type: behavior
versions: Python 3.7

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