Hi,
PFA patch to fix the PEP8 issues in Casts, Event triggers, Extensions and Languages module.
pycodestyle --config=.pycodestyle pgadmin/browser/server_groups/servers/databases/languages/
pycodestyle --config=.pycodestyle pgadmin/browser/server_groups/servers/databases/extensions/
pycodestyle --config=.pycodestyle pgadmin/browser/server_groups/servers/databases/event_triggers/
pycodestyle --config=.pycodestyle pgadmin/browser/server_groups/servers/databases/casts/