[issue20989] XML File I/O Misbehavior with open() when the flag is 'r+'

[Rex Kim]

New submission from Rex Kim:

I found a misbehavior when reading and writing XML File by open() with 'r+' flag, some strings will be overlapped at the end of the file. 

you can demonstrate it like below:

f = open(file, "r+")
c = f.read()

# todo: write something to do

f.write(c)
f.close()

Actually I'm not sure if it's bug or not however it might be.

----------
components: IO
messages: 214174
nosy: rexperience7
priority: normal
severity: normal
status: open
title: XML File I/O Misbehavior with open() when the flag is 'r+'
type: behavior
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20989>
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