iter() - Built-in Functions

Return an iterator object.  The first argument is interpreted very
differently depending on the presence of the second argument. Without a
second argument, object must be a collection object which supports the
iteration protocol (the __iter__() method), or it must support the
sequence protocol (the __getitem__() method with integer arguments
starting at 0).  If it does not support either of those protocols,
TypeError is raised. If the second argument, sentinel, is given,
then object must be a callable object.  The iterator created in this case
will call object with no arguments for each call to its
__next__() method; if the value returned is equal to
sentinel, StopIteration will be raised, otherwise the value will
be returned.

Syntax

iter(object[, sentinel])

Example

with open('mydata.txt') as fp:
    for line in iter(fp.readline, ''):
        process_line(line)

Output / Return Value

Limitations

Alternatives / See Also

Reference