Describe PyChecker here.
PyChecker is a static source analysis tool for finding bugs in python source code. It finds problems that are typically caught by a compiler for less dynamic languages, like C and C++. It is similar to lint. Because of the dynamic nature of python, some warnings may be incorrect; however, spurious warnings should be fairly infrequent.
Also read this article at unixreview.com (Is Pychecker really a Favorite of Guido's ??)