[Python-ideas] Rewriting file - pythonic way

[George Fischhof]

Hi,

some similar thing already exist in standard:
https://docs.python.org/3/library/fileinput.html

fileinput(... inplace=True...)

BR,
George

2018-04-15 10:57 GMT+02:00 Alexey Shrub <ashrub at yandex.ru>:

> Hi all,
>
> I am new in python (i am moving from Perl world), but I always love Python
> for hight level, beatuful and clean syntax.
> Now I have question/idea about working with files.
> On mine opinion it very popular use case:
> 1. Open file (for read and write)
> 2. Read data from file
> 3. Modify data.
> 4. Rewrite file by modified data.
>
> But now it is looks not so pythonic:
>
> with open(filename, 'r+') as file:
>    data = file.read()
>    data = data.replace('old', 'new')
>    file.seek(0)
>    file.write(data)
>    file.truncate()
>
> or something like this
>
> with open(filename) as file:
>    data = file.read()
> data = data.replace('old', 'new')
> with open(filename) as file:
>    file.write(data)
>
> I think best way is something like this
>
> with open(filename, 'r+') as file:
>    data = file.read()
>    data = data.replace('old', 'new')
>    file.rewrite(data)
>
> but for this io.BufferedIOBase must contain rewrite method
>
> what you think about this?
>
>
>
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