Josh Rosenberg <shadowranger+pyt...@gmail.com> added the comment:

Side-note: You say "how could i have known it was named 'f'?"

>>> help(csv.DictReader)
class DictReader
 |  Methods defined here:
 |
 |  __init__(self, f, fieldnames=None, restkey=None, restval=None, 
dialect='excel', *args, **kwds)
... rest of class help ...

Not saying the docs shouldn't be fixed, but the name is correctly given in the 
__init__ prototype (being implemented in Python, the names are always available 
to help() introspection, barring really specific cases of manual parsing of 
**kwargs). Just a general tip for the future.

----------
nosy: +josh.r

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32784>
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