pep8 fix e225

Signed-off-by: Thomas Hisch <t.hisch@gmail.com>
e227 e228

Signed-off-by: Thomas Hisch <t.hisch@gmail.com>
Merge pull request #3771 from thisch/pep8fix_e225_e227_e228

PEP8 : [examples] fix pep8 error classes e225, e227 and e228