What's New In Pylint 1.9¶

Summary -- Release highlights¶

A new Python 3 checker was added to warn about the removed operator.div function.
A new Python 3 checker was added to warn about accessing functions that have been moved from the urllib module in corresponding subpackages, such as urllib.request.
```
from urllib import urlencode
```
Instead the previous code should use urllib.parse or six.moves to import a module in a Python 2 and 3 compatible fashion:
```
from six.moves.urllib.parse import urlencode
```
To have this working on Python 3 as well, please use the six library:
```
six.reraise(Exception, "value", tb)
```
A new check was added to warn about using unicode raw string literals. This is a syntax error in Python 3:
```
a = ur'...'
```
Added a new deprecated-sys-function check, emitted when accessing removed sys members.
Added xreadlines-attribute check, emitted when the xreadlines() attribute is accessed on a file object.
Added two new Python 3 porting checks, exception-escape and comprehension-escape

These two are emitted whenever pylint detects that a variable defined in the said blocks is used outside of the given block. On Python 3 these values are deleted.
```
try:
  1/0
except ZeroDivisionError as exc:
   ...
print(exc) # This will raise a NameError on Python 3

[i for i in some_iterator if some_condition(i)]
print(i) # This will raise a NameError on Python 3
```

defaultdict and subclasses of dict are now handled for dict-iter-* checks. That means that the following code will now emit warnings for when iteritems and friends are accessed:
```
some_dict = defaultdict(list)
...
some_dict.iterkeys()
```
Enum classes no longer trigger too-few-methods
Special methods now count towards too-few-methods, and are considered part of the public API. They are still not counted towards the number of methods for too-many-methods.
docparams allows abstract methods to document returns documentation even if the default implementation does not return something. They also no longer need to document raising a NotImplementedError.