Add the `iter()` builtin to checker `C407`

iter()

Example:

even_iterator = iter([i for i in range(1,100) if i%2 == 0])

This can be directly written as:

even_iterator = iter(i for i in range(1,100) if i%2 == 0)

[joaoe]

I’m closing this issue, since it’s not generally safe due to the change in possible raised exception from IndexError to StopIteration.

#59 deals with <expr>[0]. This issue is just about a plain iter, which always raises a StopIteration when empty.

>>> next(iter([1 for _ in ""]))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration
>>> next(1 for _ in "")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration

[adamchainz]

You’re right!