What is the difference between init and enter?

Lie Ryan lie.1296 at gmail.com
Tue May 26 15:23:43 CEST 2009


Diez B. Roggisch wrote:
> John wrote:
> 
>> I'm okay with init, but it seems to me that enter is redundant since it
>> appears that anything you want to execute in enter can be done in init.
> 
> About what are you talking? 
> 
> Diez

Do you mean __init__ and __enter__?

They are used for two completely different purpose. __init__ is used to 
initialize an object when they've just been created. __enter__ is called 
when an object enters a Context Manager (i.e. with statement)

Example, when opening a file:

# this calls file.__init__
f = open('foo.bar')

# some codes...

# this calls file.__enter__
with f:
     pass




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