Issue 36278: Truncate method - Python tracker (original) (raw)

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