[New-bugs-announce] [issue25915] file.write() after file.read() adds text to the end of the file

[Adam Wasik]

New submission from Adam Wasik:

>>> 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
>>>

----------
components: IO
messages: 256756
nosy: Adam Wasik
priority: normal
severity: normal
status: open
title: file.write() after file.read() adds text to the end of the file
versions: Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25915>
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