Is there a tool to help find bugs or perform static analysis?

PyChecker is a static analysis tool that finds bugs in Python source code and warns about code complexity and style.

Pylint is another tool that checks if a module satisfies a coding standard, and also makes it possible to write plug-ins to add a custom feature. In addition to the bug checking that PyChecker performs, Pylint offers some additional features such as checking line length, whether variable names are well-formed according to your coding standard, whether declared interfaces are fully implemented, and more.