File operations

[Fredrik Lundh]

John Machin wrote:

> and don't use the name of the built-in file function as one of your
> own names

"file" is a type, not a function, and has been removed in 3.0.

given that "file" is hardly ever used in properly written Python 2 code 
(if you need to check for file-like behaviour in Python 2, check for the 
relevant attributes), assigning to "file" is a lot less problematic than 
assigning to "len" or "str" or "open" etc.

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