can you help me with this?

```
def group_iter (iterator, n=2, strict=False):

    accumulator = []
        accumulator.append(item)
        if len(accumulator) == n: 
        yield tuple(accumulator)
        accumulator = []

    if strict and len(accumulator) !=0:
        raise ValuseError("Leftover values")

print "This is count %r " % group_iter 

```

and when I run it I get: 

```
accumulator.append (item)
IndentationError: unexpected indent

```

How can I solve this problem? Thanks!