Pylint includes a spell-checker since 1.4.0.
Note that, to make the checker work, you need to install pyenchant python module and have an enchant library installed system-wide. On mac, it can be installed via brew:
$ brew install enchant
By default, the spelling pylint checker is turned off. You can enable it either in the pylint rc configuration file or from the command-line:
$ cat test.py
# I am the tyop
$ pylint --disable all --enable spelling --spelling-dict en_US test.py
C: 1, 0: Wrong spelling of a word 'tyop' in a comment:
# I am the tyop
^^^^
Did you mean: 'typo' or 'top' or 'tip' or 'topi'? (wrong-spelling-in-comment)