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file.write() after file.read() adds text to the end of the file #70103

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file.write() after file.read() adds text to the end of the file#70103
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topic-IOtype-bugAn unexpected behavior, bug, or error

Description

@AdamWasik
AdamWasik
mannequin
opened on Dec 20, 2015
BPO 25915
Superseder
  • bpo-12215: TextIOWrapper: issues with interlaced read-write
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
closed_at = <Date 2015-12-20.09:55:38.642>
created_at = <Date 2015-12-20.09:44:25.956>
labels = ['type-bug', 'expert-IO']
title = 'file.write() after file.read() adds text to the end of the file'
updated_at = <Date 2015-12-20.09:56:50.377>
user = 'https://bugs.python.org/AdamWasik'

    bugs.python.org fields:

    activity = <Date 2015-12-20.09:56:50.377>
actor = 'SilentGhost'
assignee = 'none'
closed = True
closed_date = <Date 2015-12-20.09:55:38.642>
closer = 'Adam Wasik'
components = ['IO']
creation = <Date 2015-12-20.09:44:25.956>
creator = 'Adam Wasik'
dependencies = []
files = []
hgrepos = []
issue_num = 25915
keywords = []
message_count = 2.0
messages = ['256756', '256758']
nosy_count = 1.0
nosy_names = ['Adam Wasik']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '12215'
type = 'behavior'
url = 'https://bugs.python.org/issue25915'
versions = ['Python 3.5']

    Activity

    1. AdamWasik commented on Dec 20, 2015

      @AdamWasik
      AdamWasikmannequin
      on Dec 20, 2015
      MannequinAuthor
      >>> file = open(r"C:\adam.txt","r+")
>>> file.read()
'TEXT TEXT TEXT TEXT TEXT TEXT TEXT\nTEXT TEXT TEXT TEXT TEXT TEXT TEXT\nTEXT TE
XT TEXT TEXT TEXT TEXT TEXT\nTEXT TEXT TEXT TEXT TEXT TEXT TEXT\nTEXT TEXT TEXT
TEXT TEXT TEXT TEXT\nTEXT TEXT TEXT TEXT TEXT TEXT TEXT'
>>> file.seek(0,0)
0
>>> file.read(1)
'T'
>>> file.tell()
1
>>> file.write("NEW")
3
>>> file.tell() # Why 217 rather than 4. Text is added at the end file
217
>>>
    2. AdamWasik
      added
      topic-IO
      on Dec 20, 2015

    3. AdamWasik commented on Dec 20, 2015

      @AdamWasik
      AdamWasikmannequin
      on Dec 20, 2015
      MannequinAuthor

      duplicate of the issue bpo-12215

    4. AdamWasik
      closed this as completedon Dec 20, 2015
    5. SilentGhost
      added
      type-bugAn unexpected behavior, bug, or error
      on Dec 20, 2015
    6. ezio-melotti
      transferred this issue fromon Apr 10, 2022
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