I really don't like this particular form because the indentation level doesn't match the block's scope.  We haven't started a new statement yet so we shouldn't be putting anything at the indent level where the statement started.  Here's some alternatives:

``` python
builds = self.get_koji_session(login=False)\
    .listTagged(tag, latest=True)
```
My favorite because it gives an indication on both lines that there's a line continuation and the line break occurs where there's a mental break in the logic ("return an object from get_koji_session. [line break] Call listTagged() on that object")  However, a dot is an easy punctuation mark to miss so other people might not like this.

``` python
builds = self.get_koji_session(
    login=False
    ).listTagged(tag, latest=True)
```
/usr/bin/pep8 doesn't like this but it appears to be legal in the actual PEP8:

```
The closing brace/bracket/parenthesis on multi-line constructs may either line up
under the first non-whitespace character of the last line of list, as in:

my_list = [
    1, 2, 3,
    4, 5, 6,
    ]
```

``` python
builds = self.get_koji_session(login=False
                               ).listTagged(tag, latest=True)
```
This keeps listTagged() indented by aligning with the parameter list.  This is a so-so look.  It's not always usable because it doesn't save as much horizontal space as any of the other styles.

``` python
builds = self.get_koji_session(
    login=False).listTagged(tag, latest=True)
```
This is a variant on the former.  It gains back more space so it can be used in some other situations.