String concatenation vs. string formatting

[Andrew Berg]

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On 2011.07.09 09:54 PM, Dennis Lee Bieber wrote:
> "file" is a built-in (related to "open").
It is? What is it?
 
>>> type(file)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'file' is not defined
 
I don't see it in the docs as a built-in function, constant or type.
 
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