Anshu Kumar wrote:
> Hello Everyone,
>
> I try below code in python 2.7.10 to first create and write into a file
> and
> then read and write that file but what i get is just a file with new
> content.
>
>
>>>> with open('test.txt', 'wb+') as f:
> ... f.write('this is test file.')
> ... f.write('ok!!!')
> ...
>>>> with open('test.txt', 'wb+') as f:
> ... a_str = f.read() + 'read the file'
> ... f.seek(0)
> ... f.write(a_str)
> ...
>
>
> I have read in documentation that wb+ mode is for writing and reading. Am
> i using wrong mode, should i use rb+ ?
Quoting https://docs.python.org/2.7/library/functions.html#open
"""
note that 'w+' truncates the file.
"""
That's why you lose the file's current content, and, yes, "r+b" would avoid
that.
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