[Python-ideas] Rewriting file - pythonic way

[Serhiy Storchaka]

15.04.18 12:49, Alexey Shrub пише:
> В Воскресенье, 15 апр. 2018 в 12:40 , Serhiy Storchaka 
> <storchaka at gmail.com> написал:
>> If the problem is that you want to use a single line instead of three
>> line, you can add a function
> 
> Yes, I think that single line with word 'rewrite' is much more readable 
> than those three lines.
> And yes, I can make my own function, but it is typical task - maybe it 
> must be in standard library?

Not every three lines of code must be a function in standard library. 
And these three lines don't look enough common.

Actually the reliable code should write into a separate file and replace 
the original file by the new file only if writing is successful. Or 
backup the old file and restore it if writing is failed. Or do both. And 
handle hard and soft links if necessary. And use file locks if needed to 
prevent race condition when read/write by different processes. Depending 
on the specific of the application you may need different code. Your 
three lines are enough for a one-time script if the risk of a powerful 
blackout or disk space exhaustion is insignificant or if the data is not 
critical.